Major OpenModelica Releases

This Appendix lists the most important OpenModelica releases and a brief description of their contents. Right now versions from 1.3.1 to 1.16.0 are described.

Release Notes for OpenModelica 1.16.0

OpenModelica Compiler (OMC)

The new frontend has been further improved, with enhanced support of records and arrays. 26 tickets were fixed since the previous 1.14.0 release. The new front-end can now handle 100% of the Modelica Standard Library 3.2.3 models.

Improvements to the back-end: - new minimal tearing option to disable tearing except for discrete variables - improved symbolic Jacobian evaluation option reuses constant part of the Jacobian - improvements to dynamic state selection and common subexpression elimination - new ASCC algorithm replaces and improves resolveLoops algorithm, allowing to detect high-index problems with indirect structural state constraints, e.g. in three-phase AC circuits - homotopy operator now used on first try by default - linearized model export also available in Matlab, Python, and Julia with option

Improvements to code generation and runtime:

  • Better support for models with records - CVODE solver from SUNDIALS

added; – 2 methods available: BDF (stiff) and Adams-Moulton (non-stiff)

It is now possible to build a version of OMC with parallel Jacobian evaluation using OpenMP

``  - On Windows build OMC with``
``    \ \ ``.
``  - On Unix configure with \ \ `` and build OMC.
``  - Only DASSL and IDA can use parallelized symbolic Jacobians.``
``  - Simulate with \ \ `` or set environment
``    variable \ \ `` to use a specific number of
``    threads. Otherwise all available threads will be used.``

Graphic Editor OMEdit

Replaceable classes now have graphical support in OMEdit. This feature was planned to be included in release 1.15.0, but it eventually turned out to be more convenient to merge it in the 1.16.0 release.

Many bug fixes to increase usability of the GUI.

OMSimulator GUI improved: text editing of SSP models, undo/redo, delete components, etc.

FMI Support

Many FMI export bug fixes and improvements to increase usability of OMC-generated FMUs.

FMI/CS 2.0 now includes CVODE solvers (previously only fixed-step forward Euler) and customization via simulation flags.

Other things

Successful integration of Modelon’s license manager for encrypted libraries. A special version of OMC available to Consortium members can now handle encrypted libraries, preventing source code browsing, and license management, via Modelon’s license manager, embedded in the encrypted library.

Improved Modelica package management. The annotation is now fully supported, which means for example that OpenModelica will automatically use the Modelica Standard Library 3.2.3 even for libraries that have a uses annotation pointing to earlier MSL versions, e.g. 3.2.2 or 3.2.1, because the annotations in the MSL specify that 3.2.3 can be used instead of 3.2.2 or 3.2.1 without any conversion script, i.e., it is fully backwards compatible. A full-fledged Modelica package manager is also included in OpenModelica 1.16.0, currently only with a command line interface; integration in the GUI is planned for the next 1.17.0 release, together with conversion scripts.

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Release Notes for OpenModelica 1.15.0

Release 1.15.0 was initially planned to add graphical support of replaceable classes in OMEdit to 1.14.0. The developement took more time than expected. Back-porting it to 1.14.0 turned out to be unnecessarily difficult and time-consuming. Hence, we decided to cancel 1.15.0 and to release the support of replaceable classes in 1.16.0.

Release Notes for OpenModelica 1.14.0

OpenModelica Compiler (OMC)

The most dramatic enhancement of the OpenModelica Compiler is the New Frontend, which on the average gives a factor of 10-20 speed improvement in the flattening phase of compilation. The new frontend is default in this release, but a feature is implemented that allows the user to switch to the old frontend if problems appear for a specific model The speed of the OMEdit GUI has only slightly increased in this version, since it is still dependent mostly on the old frontend. Further GUI speed increases are available in the coming OpenModelica.1.15.0. About 200 issues have been fixed, including enhancements, compared to the previous 1.13.2 release. The bug fixes are on trac.

OpenModelica Compiler New Frontend news: • Implementation of expandable connectors completed, a rather large piece of work. • A number of smaller enhancements and fixes • The New Frontend (NF)gives slightly better simulation coverage on MSL 3.2.3 than the Old Frontend • The New Frontend is on the average about 20 times faster on flattening. • Remaining work is mainly on further bug fixing and testing the new frontend for all other libraries, as well as more work on modifiers of arrays in conjunction with non-expanded arrays. (The array modifiers have now been implemented in 1.16.0 but not yet it 1.14.0 in order to not delay the 1.14.0 release)

Graphic Editor OMEdit

  • Drag and drop for the text layer. • Auto completion of class names,

components and annotations. • GUI for data reconciliation – a method for increasing sensor data precision • Improved duplication functionality for copying classes. • Better handling of Compiler flags. • Partly completed: annotations for dynamic icon update. • Support for connectorSizing annotation • Several bug fixes. You can find the list here. • Docs: https://openmodelica.org/doc/OpenModelicaUsersGuide/latest/omedit.html . • Autocomplete annotations. • Support for Icon/Diagram map annotation • Copy paste functionality • Reset OMEdit settings/options. • Array plots update on re-simulation • Support for connectorSizing annotation. • Drag and drop class names to text layer in OMEdit • OMPlot: Improved plotting e.g., top and bottom margins for better view, snap to curve etc. • GUI support for replaceable libraries is being tested in a separate branch and will be made available in the coming 1.15.0 release.

OMC backend and run-time system

  • A new more efficient and correct implementation of arrays and records.

  • The FMI OMSimulator API calls are now also available in the OMC API

functions, e.g. for use from OMNotebook, Jupyter notebooks.

Backend new features

  • Added possibility to generate analytic Jacobians for linear strong

components

``   * -Use flag LSanalyticJacobian to enable analytical Jacobian for linear loops. Default false.``

  • Added output language options for linearization: matlab, python,

julia. • Available with --linearizationDumpLanguage=modelica/matlab/python/julia. Default is modelica.

Backend enhancements

  • Unified Jacobian evaluation from DASSL and IDA integrators • Added

result check for linear solvers Lis, Klu, Total Pivot and Umfpack if a residual function is available. • Improved debug dumping

``   * -d=bltdump (Index reduction information)``
``   * -d=initialization``
``   * -d=dumpLoops``
  • Improved warning for iteration variables:

``   * Only warn about non-linear iteration variables with default start attribute.``
``   * Other variables have no influence on simulation at all.``
  • Build instructions for OpenModelica on Windows Subsystem for Linux •

Improved Jacobian evaluation with translation flag -d=symJacConstantSplit (requires --generateSymbolicJacobian) Generate Jacobians with separated constant part to split equations that are independent of the seed vector. These equations only need to be evaluated only once per Jacobian evaluation.

Backend bugfixes

  • Homotopy: Use simplified version only during initialization to avoid

errors during matching and differentiation. • Logging for Homotopy path fixed so log can be loaded in OMEdit. • Support general function call differentiation for equations in residual form. • Equations in residual form don't fail during index reduction any more.

FMI Support

Bug fixes to FMI export, see below

Release Notes for OpenModelica 1.13.0

  • OMSimulator 2.0 – the second release of our efficient FMI Simulation

tool including a GUI for FMI Composition, co-simulation and model-exchange simulation, and SSP standard support. - Model and library encryption/decryption support. (Only for usage by OSMC member organizations) - Improved OpenModelica DAEMode for efficient solution of large Modelica models. - Julia scripting API to OpenModelica. - Basic Matlab scripting API to OpenModelica. - OMSysIdent - parameter estimation module for linear and non-linear parametric dynamic models. - Interactive simulation and control of simulations with OPC-UA. - PDEModelica1 - experimental support for one-dimensional PDEs in Modelica. - Analytic directional derivatives for FMI export and efficient calculation of multiple Jacobian columns – giving much faster simulation for some models - Enhanced OMEdit – including fast multi-file search. - Improved error messages and stability. - A version of the new fast compiler frontend available for testing, can be enabled by a flag Currently (December 10), simulates about 84% of MSL 3.2.2

Note: the replaceable GUI support has been moved to OpenModelica 1.14.0 and will be available in nightly builds.

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Release Notes for OpenModelica 1.12.0

  • A new (stand-alone) FMI- and TLM-based simulation tool OMSimulator, first version for connected FMUs, TLM objects, Simulink models (via wrappers), Adams models (via wrappers), BEAST models (via wrappers), Modelica models

  • Graphic configuration editing of composite models consisting of FMUs

  • Basic graphical editing support for state machines and transitions

  • Faster lookup processing, making some libraries faster to browse and compile

  • Additional advanced visualization features for multibody animation

  • Increased library coverage including significantly increased verification coverage

  • Increased tool interoperability by addition of the ZeroMQ communications protocol

  • Further enhanced OMPython including linearization, now also working with Python 3

  • Support for RedHat/Fedora binary builds of OpenModelica

OpenModelica Compiler (OMC)

  • Faster lookup processing

  • Initializing external objects together with parameters

  • Handle exceptions in numeric solvers

  • Support for higher-index discrete clock partitions

  • Improved unit checking

  • Improved initialization of start values

  • Decreased compilation time of models with large size arrays

  • New approach for homotopy-based initialization (still experimental)

  • A bunch of fixes: Bugs, regressions, performance issues

  • Improved Dynamic Tearing by adding constraints for the casual set

  • Improved module wrapFunctionCalls with one-time evaluation of Constant CSE-variables

  • Added initOptModule for inlineHomotopy

  • Added configuration flag tearingStrictness to influence solvability

  • New methods for inline integration for continuous equations in clocked partitions, now covering: ExplicitEuler, ImplicitEuler, SemiImplicitEuler and ImplicitTrapezoid

  • Complete implementation of synchronous features in C++ runtime

  • Refactored linear solver of C++ runtime

  • Improved Modelica_synchronous_cpp coverage

  • New common linear solver module, optionally sparse, for the C++ runtime

  • Coverage of most of the OpenHydraulics library

  • Improved coverage of ThermoSysPro, IdealizedContact and Chemical libraries

  • Support of time events for cpp-simulation and enabled time events in cpp-FMUs

  • Global homotopy method for initialization

  • Scripting API to compute accumulated errors (1-norm, 2-norm, max. error) of 2 time series

Graphic Editor OMEdit

  • Additional advanced visualization features for multibody animation (transparency, textures, change colours by dialog)

  • An HTML WYSIWYG Editor, e.g. useful for documentation

  • Support for choices(checkBox=true) annotation.

  • Support for loadSelector & saveSelector attribute of Dialog annotation.

  • Panning of icon/diagram view and plot window.

  • AutoComplete feature in text editing for keywords, types, common Modelica constructs

  • Follow connector transformation from Diagram View to Icon View.

  • Further stability improvements

  • Improved performance for rendering some icons using the interactive API

  • Improved handling of parameters that cannot be evaluated in Icon annotations

  • Basic graphic editing support for state machines and transitions (not yet support for showing state internals on diagram layer)

  • Interactive state manipulation for FMU-based animations

FMI Support

  • A new (stand-alone) FMI- and TLM-based simulation tool OMSimulator, first version (a main deliverable of the OPENCPS project, significant contributions and code donations from SKF)

  • Graphic configuration editing of composite models consisting of FMUs

  • Co-simulation/simulation of connected FMUs, TLM objects, Simulink models (via wrappers), Adams models (via wrappers), BEAST models (via wrappers), Modelica models.

Other things

  • Increased OpenModelica tool interoperability by adding the ZeroMQ communications protocol in addition to the previously available Corba. This also enables Python 3 usage in OMPython on all platforms.

  • Textual support through the OpenModelica API and graphical support in OMEdit for generation of single or multiple requirement verification scenarios

  • VVDRlib – a small library for connecting requirements and models together, with notions for mediators, scenarios, design alternatives

  • Further enhanced OMPython including linearization, now also working with Python 3.¨

  • Jupyter notebooks also supported with OMPython and Python 3

  • New enhanced library testing script (libraries.openmodelica.org/branches).

  • Addition of mutable reference data types in MetaModelica

  • Support for RedHat/Fedora binary builds of OpenModelica

  • Support for exporting the system of equations in GraphML (yEd) format for debugging

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Release Notes for OpenModelica 1.11.0

  • Dramatically improved compilation speed and performance, in particular for large models.

  • 3D animation visualization of regular MSL MultiBody simulations and for real-time FMUs.

  • Better support for synchronous and state machine language elements, now supports 90% of the clocked synchronous library.

  • Several OMEdit improvements including folding of large annotations.

  • 64-bit OM on Windows further stabilized

  • An updated OMDev (OpenModelica Development Environment), involving msys2. This was needed for the shift to 64-bit on Windows.

  • Integration of Sundials/IDA DAE solver with potentially large increase of simulation performance for large models with sparse structure.

  • Improved library coverage.

  • Parameter sensitivity analysis added to OMC.

OpenModelica Compiler (OMC)

  • Real-time synchronization support by using simFlag -rt=1.0 (or some other time scaling factor).

  • A prototype implementation of OPC UA using an open source OPC UA implementation. The old OPC implementation was not maintained and relied on a Windows-only proprietary OPC DA+UA package. (At the moment, OPC is experimental and lacks documentation; it only handles reading/writing Real/Boolean input/state variables. It is planned for OMEdit to use OPC UA to re-implement interactive simulations and plotting.)

  • Dramatically improved compilation speed and dramatically reduced memory requirements for very large models. In Nov 2015, the largest power generation and transmission system model that OMC could handle had 60000 equations and it took 700 seconds to generate the simulation executable code; it now takes only 45 seconds to do so with OMC 1.11.0, which can also handle a model 10 times bigger (600 000 equations) in less than 15 minutes and with less than 32 GB of RAM. Simulation times are comparable to domain-specific simulation tools. See for example ScalableTestSuite for some of the improvements.

  • Improved library coverage

  • Better support for synchronous and state machine language elements, now simulates 90% of the clocked synchronous library.

  • Enhanced Cpp runtime to support the PowerSystems library.

  • Integration of Sundials/IDA solver as an alternative to DASSL.

  • A DAEMode solver mode was added, which allows to use the sparse IDA solver to handle the DAEs directly. This can lead to substantially faster simulation on large systems with sparse structure, compared to the traditional approach.

  • The direct sparse solvers KLU and SuperLU have been added, with benefits for models with large algebraic loops.

  • Multi-parameter sensitivity analysis added to OMC.

  • Progress on more efficient inline function mechanism.

  • Stabilized 64-bit Windows support.

  • Performance improvement of parameter evaluation.

  • Enhanced tearing support, with prefer iteration variables and user-defined tearing.

  • Support for external object aliases in connectors and equations (a non-standard Modelica extension).

  • Code generation directly to file (saves maximum memory used). #3356

  • Code generation in parallel is enabled since #3356 (controlled by omc flag `-n`). This improves performance since generating code directly to file avoid memory allocation.

  • Allowing mixed dense and sparse linear solvers in the generated simulation (chosen depending on simflags `-ls` (dense solver), `-lss` (sparse solver), `-lssMaxDensity` and `-lssMinSize`).

Graphic Editor OMEdit

  • Significantly faster browsing of most libraries.

  • Several GUI improvements including folding of multi-line annotations.

  • Further improved code formatting preservation during edits.

  • Support for all simulation logging flags.

  • Select and export variables after simulation.

  • Support for Byte Order Mark. Added support enables other tools to correctly read the files written by OMEdit.

  • Save files with line endings according to OS (Windows (CRLF), Unix (LF)).

  • Added OMEdit support for FMU cross compilation. This makes it possible to launch OMEdit on a remote or virtual Linux machine using a Windows X server and export an FMU with Windows binaries.

  • Support of DisplayUnit and unit conversion.

  • Fixed automatic save.

  • Initial support for DynamicSelect in model diagrams (texts and visible attribute after simulation, no expressions yet).

  • An HTML documentation editor (not WYSIWYG; that editor will be available in the subsequent release).

  • Improved logging in OMEdit of structured messages and standard output streams for simulations.

FMI Support

  • Cross compilation of C++ FMU export. Compared to the C runtime, the C++ cross compilation covers the whole runtime for model exchange.

  • Improved Newton solver for C++ FMUs (scaling and step size control).

Other things

  • 3D animation visualization of regular MSL MultiBody simulations and for real-time FMUs.

  • An updated OMDev (OpenModelica Development Environment), involving msys2. This was needed for the shift to 64-bit on Windows.

  • OMWebbook, a web version of OMNotebook online. Also, a script is available to convert an OMNotebook to an OMWebbook.

  • A Jupyter notebook Modelica mode, available in OpenModelica.

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Release Notes for OpenModelica 1.10.0

The most important enhancements in the OpenModelica 1.10.0 release:

OpenModelica Compiler (OMC)

New features:

  • Real-time synchronization support by using simFlag -rt=1.0 (or some

other time scaling factor). - A prototype implementation of OPC UA using an open source OPC UA implementation. The old OPC implementation was not maintained and relied on a Windows-only proprietary OPC DA+UA package. (At the moment, OPC is experimental and lacks documentation; it only handles reading/writing Real/Boolean input/state variables. It is planned for OMEdit to use OPC UA to re-implement interactive simulations and plotting.)

Performance enhancements:

  • Code generation directly to file (saves maximum memory used). #3356 -

Code generation in parallel enabled since #3356 allows this without allocating too much memory (controlled by omc flag `-n`). - Various scalability enhancements, allowing the compiler to handle hundreds of thousands of equations. See for example ScalableTestSuite for some of the improvements. - Better defaults for handling tearing (OMC flags `--maxSizeLinearTearing` and `--maxSizeNonlinearTearing`). - Allowing mixed dense and sparse linear solvers in the generated simulation (chosen depending on simflags `-ls` (dense solver), `-lss` (sparse solver), `-lssMaxDensity` and `-lssMinSize`).

Graphic Editor OMEdit

OpenModelica Notebook (OMNotebook)

Optimization

FMI Support

OpenModelica Development Environment (OMDev)

Release Notes for OpenModelica 1.9.4

OpenModelica v1.9.4 was released 2016-03-09. These notes cover the v1.9.4 release and its subsequent bug-fix releases (now up to 1.9.7).

OpenModelica Compiler (OMC)

  • Improved simulation speed for many models. simulation speed went up for 80% of the models. The compiler frontend became faster for almost all models, average about 40% faster.

  • Initial support for synchronous models with clocked equations as defined in the Modelica 3.3 standard

  • Support for homotopy operator

Graphic Editor OMEdit

  • Undo/Redo support.

  • Preserving text formatting, including indentation and whitespace. This is especially important for diff/merge with several collaborating developers possibly using several different Modelica tools.

  • Better support for inherited classes.

  • Allow simulating models using visual studio compiler.

  • Support for saving Modelica package in a folder structure.

  • Allow reordering of classes inside a package.

  • Highlight matching parentheses in text view.

  • When copying the text retain the text highlighting and formatting.

  • Support for global head definition in the documentation by using `__OpenModelica_infoHeader` annotation.

  • Support for expandable connectors.

  • Support for uses annotation.

FMI Support

  • Full FMI 2.0 co-simulation support now available

  • Upgrade Cpp runtime from C++03 to C++11 standard, minimizing external link dependencies. Exported FMUs don't depend on additional libraries such as boost anymore

  • FMI 2.0 is broken for some models in 1.9.4. Upgrading to 1.9.6 is advised.

Release Notes for OpenModelica 1.9.3

The most important enhancements in the OpenModelica 1.9.3 release:

  • Enhanced collaborative development and testing of OpenModelica by moving to the GIT-hub framework for versioning and parallel development.

  • More accessible and up-to-date automatically generated documentation provided in both html and pdf.

  • Further improved simulation speed and coverage of several libraries.

  • OMEdit graphic connection editor improvements.

  • OMNotebook improvements.

OpenModelica Compiler (OMC)

This release mainly includes improvements of the OpenModelica Compiler (OMC), including, but not restricted to the following:

  • Further improved simulation speed and coverage for several libraries.

  • Faster generated code for functions involving arrays, factor 2 speedup for many power generation models.

  • Better initialization.

  • An implicit inline Euler solver available.

  • Code generation to enable vectorization of for-loops.

  • Improved non-linear, linear and mixed system solving.

  • Cross-compilation for the ARMhf architecture.

  • A prototype state machine implementation.

  • Improved performance and stability of the C++ runtime option.

  • More accessible and up-to-date automatically generated documentation provided in both html and .pdf.

Graphic Editor OMEdit

There are several improvements to the OpenModelica graphic connection editor OMEdit:

  • Support for uses annotations.

  • Support for declaring components as vectors.

  • Faster messages browser with clickable error messages.

  • Support for managing the stacking order of graphical shapes.

  • Several improvements to the plot tool and text editor in OMEdit.

OpenModelica Notebook (OMNotebook)

Several improvements:

  • Support for moving cells from one place to another in a notebook.

  • A button for evaluation of whole notebooks.

  • A new cell type called Latex cells, supporting Latex formatted input that provides mathematical typesetting of formulae when evaluated.

Optimization

Several improvements of the Dynamic Optimization module with collocation, using Ipopt:

  • Better performance due to smart treatment of algebraic loops for optimization.

  • Improved formulation of optimization problems with an annotation approach which also allows graphical problem formulation.

  • Proper handling of constraints at final time.

FMI Support

Further improved FMI 2.0 co-simulation support.

OpenModelica Development Environment (OMDev)

A big change: version handling and parallel development has been improved by moving from SVN to GIThub. This makes it easier for each developer to test his/her fixes and enhancements before committing the code. Automatic mirroring of all code is still performed to the OpenModelica SVN site.

Release Notes for OpenModelica 1.9.2

The OpenModelica 1.9.2 Beta release is available now, January 31, 2015. Please try it and give feedback! The final release is planned within 1-2 weeks after some more testing. The most important enhancements in the OpenModelica 1.9.2 release:

  • The OpenModelica compiler has moved to a new development and release platform: the bootstrapped OpenModelica compiler. This gives advantages in terms of better programmability, maintenance, debugging, modularity and current/future performance increases.

  • The OpenModelica graphic connection editor OMEdit has become 3-5 times faster due to faster communication with the OpenModelica compiler linked as a DLL. This was made possible by moving to the bootstrapped compiler.

  • Further improved simulation coverage for a number of libraries.

  • OMEdit graphic connection editor improvements

OpenModelica Compiler (OMC)

This release mainly includes improvements of the OpenModelica Compiler (OMC), including, but not restricted to the following:

  • The OpenModelica compiler has moved to a new development and release platform: the bootstrapped OpenModelica compiler. This gives advantages in terms of better programmability, maintenance, debugging, modularity and current/future performance increases.

  • Further improved simulation coverage for a number of libraries compared to 1.9.1. For example:

    • MSL 3.2.1 100% compilation, 97% simulation (3% increase)

    • MSL Trunk 99% compilation (1% increase), 93% simulation (3% increase)

    • ModelicaTest 3.2.1 99% compilation (2% increase), 95% simulation (6% increase)

    • ThermoSysPro 100% compilation, 80% simulation (17% increase)

    • ThermoPower 97% compilation (5% increase), 85% simulation (5% increase)

    • Buildings 80% compilation (1% increase), 73% simulation (1% increase)

  • Further enhanced OMC compiler front-end coverage, scalability, speed and memory.

  • Better initialization.

  • Improved tearing.

  • Improved non-linear, linear and mixed system solving.

  • Common subexpression elimination support - drastically increases performance of some models.

Graphic Editor OMEdit

  • The OpenModelica graphic connection editor OMEdit has become 3-5 times faster due to faster communication with the OpenModelica compiler linked as a DLL. This was made possible by moving to the bootstrapped compiler.

  • Enhanced simulation setup window in OMEdit, which among other things include better support for integration methods and dassl options.

  • Support for running multiple simultaneous simulation.

  • Improved handling of modifiers.

  • Re-simulate with changed options, including history support and re-simulating with previous options possibly edited.

  • More user friendly user interface by improved connection line drawing, added snap to grid for icons and conversion of icons from PNG to SVG, and some additional fixes.

Optimization

Some smaller improvements of the Dynamic Optimization module with collocation, using Ipopt.

FMI Support

Further improved for FMI 2.0 model exchange import and export, now compliant according to the FMI compliance tests. FMI 1.0 support has been further improved.

Release Notes for OpenModelica 1.9.1

The most important enhancements in the OpenModelica 1.9.1 release:

  • Improved library support.

  • Further enhanced OMC compiler front-end coverage and scalability

  • Significant improved simulation support for libraries using Fluid and Media.

  • Dynamic model debugger for equation-based models integrated with OMEdit.

  • Dynamic algorithm model debugger with OMEdit; including support for MetaModelica when using the bootstrapped compiler.

New features: Dynamic debugger for equation-based models; Dynamic Optimization with collocation built into OpenModelica, performance analyzer integrated with the equation model debugger.

OpenModelica Compiler (OMC)

This release mainly includes improvements of the OpenModelica Compiler (OMC), including, but not restricted to the following:

  • Further improved OMC model compiler support for a number of libraries including MSL 3.2.1, ModelicaTest 3.2.1, PetriNet, Buildings, PowerSystems, OpenHydraulics, ThermoPower, and ThermoSysPro.

  • Further enhanced OMC compiler front-end coverage, scalability, speed and memory.

  • Better coverage of Modelica libraries using Fluid and Media.

  • Automatic differentiation of algorithms and functions.

  • Improved testing facilities and library coverage reporting.

  • Improved model compilation speed by compiling model parts in parallel (bootstrapped compiler).

  • Support for running model simulations in a web browser.

  • New faster initialization that handles over-determined systems, under-determined systems, or both.

  • Compiler back-end partly redesigned for improved scalability and better modularity.

  • Better tearing support.

  • The first run-time Modelica equation-based model debugger, not available in any other Modelica tool, integrated with OMEdit.

  • Enhanced performance profiler integrated with the debugger.

  • Improved parallelization prototype with several parallelization strategies, task merging and duplication, shorter critical paths, several scheduling strategies.

  • Some support for general solving of mixed systems of equations.

  • Better error messages.

  • Improved bootstrapped OpenModelica compiler.

  • Better handling of array subscripts and dimensions.

  • Improved support for reduction functions and operators.

  • Better support for partial functions.

  • Better support for function tail recursion, which reduces memory usage.

  • Partial function evaluation in the back-end to improve solving singular systems.

  • Better handling of events/zero crossings.

  • Support for colored Jacobians.

  • New differentiation package that can handle a much larger number of expressions.

  • Support for sparse solvers.

  • Better handling of asserts.

  • Improved array and matrix support.

  • Improved overloaded operators support.

  • Improved handling of overconstrained connection graphs.

  • Better support for the cardinality operator.

  • Parallel compilation of generated code for speeding up compilation.

  • Split of model files into several for better compilation scalability.

  • Default linear tearing.

  • Support for impure functions.

  • Better compilation flag documentation.

  • Better automatic generation of documentation.

  • Better support for calling functions via instance.

  • New text template based unparsing for DAE, Absyn, SCode, TaskGraphs, etc.

  • Better support for external objects (#2724, reject non-constructor functions returning external objects)

  • Improved C++ runtime.

  • Improved testing facilities.

  • New unit checking implementation.

  • Support for model rewriting expressions via rewriting rules in an external file.

  • Reject more bad code (r19986, consider records with different components type-incompatible)

OpenModelica Connection Editor (OMEdit)

  • Convenient editing of model parameter values and re-simulation without recompilation after parameter changes.

  • Improved plotting.

  • Better handling of flags/units/resources/crashes.

  • Run-time Modelica equation-based model debugger that provides both dynamic run-time debugging and debugging of symbolic transformations.

  • Run-time Modelica algorithmic code debugger; also MetaModelica debugger with the bootstrapped OpenModelica compiler.

OMPython

The interface was changed to version 2.0, which uses one object for each OpenModelica instance you want active. It also features a new and improved parser that returns easier to use datatypes like maps and lists.

Optimization

A builtin integrated Dynamic Optimization module with collocation, using Ipopt, is now available.

FMI Support

Support for FMI 2.0 model exchange import and export has been added. FMI 1.0 support has been further improved.

Release Notes for OpenModelica 1.9.0

This is the summary description of changes to OpenModelica from 1.8.1 to 1.9.0, released 2013-10-09. This release mainly includes improvements of the OpenModelica Compiler (OMC), including, but not restricted to the following:

OpenModelica Compiler (OMC)

This release mainly includes bug fixes and improvements of the OpenModelica Compiler (OMC), including, but not restricted to the following:

  • A more stable and complete OMC model compiler. The 1.9.0 final version simulates many more models than the previous 1.8.1 version and OpenModelica 1.9.0 beta versions.

  • Much better simulation support for MSL 3.2.1, now 270 out of 274 example models compile (98%) and 245 (89%) simulate, compared to 30% simulating in the 1.9.0 beta1 release.

  • Much better simulation for the ModelicaTest 3.2.1 library, now 401 out of 428 models build (93%) and 364 simulate (85%), compared to 32% in November 2012.

  • Better simulation support for several other libraries, e.g. more than twenty examples simulate from ThermoSysPro, and all but one model from PlanarMechanics simulate.

  • Improved tearing algorithm for the compiler backend. Tearing is by default used.

  • Much faster matching and dynamic state selection algorithms for the compiler backend.

  • New index reduction algorithm implementation.

  • New default initialization method that symbolically solves the initialization problem much faster and more accurately. This is the first version that in general initialize hybrid models correctly.

  • Better class loading from files. The package.order file is now respected and the file structure is more thoroughly examined (#1764).

  • It is now possible to translate the error messages in the omc kernel (#1767).

  • FMI Support. FMI co-simulation with OpenModelica as master. Improved

FMI Import and export for model exchange. Most of FMI 2.0 is now also supported.

  • Checking (when possible) that variables have been assigned to before they are used in algorithmic code (#1776).

  • Full version of Python scripting.

  • 3D graphics visualization using the Modelica3D library.

  • The PySimulator package from DLR for additional analysis is integrated with OpenModelica (see Modelica2012 paper), and included in the OpenModelica distribution (Windows only).

  • Prototype support for uncertainty computations, special feature enabled by special flag.

  • Parallel algorithmic Modelica support (ParModelica) for efficient portable parallel algorithmic programming based on the OpenCL standard, for CPUs and GPUs.

  • Support for optimization of semiLinear according to MSL 3.3 chapter 3.7.2.5 semiLinear (r12657,r12658).

  • The compiler is now fully bootstrapped and can compile itself using a modest amount of heap and stack space (less than the RML-based compiler, which is still the default).

  • Some old debug-flags were removed. Others were renamed. Debug flags can now be enabled by default.

  • Removed old unused simulation flags noClean and storeInTemp (r15927).

  • Many stack overflow issues were resolved.

  • Dynamic Optimization with OpenModelica. Dynamic optimization with XML export to the CasADi package is now integrated with OpenModelica. Moreover, a native integrated Dynamic Optimization prototype using Ipopt is now in the OpenModelica release, but currently needs a special flag to be turned on since it needs more testing and refinement before being generally made available.

OpenModelica Notebook (OMNotebook)

  • A `shortOutput` option has been introduced in the simulate command

for less verbose output. The DrModelica interactive document has been updated and the models tested. Almost all models now simulate with OpenModelica.

OpenModelica Eclipse Plug-in (MDT)

  • Enhanced debugger for algorithmic Modelica code, supporting both

standard Modelica algorithmic code called from simulation models, and MetaModelica code.

OpenModelica Development Environment (OMDev)

  • Migration of version handling and configuration management from

CodeBeamer to Trac.

Graphic Editor OMEdit

  • General GUI: backward and forward navigation support in Documentation view, enhanced parameters window with support for Dialog annotation. Most of the images are converted from raster to vector graphics i.e PNG to SVG.

  • Libraries Browser: better loading of libraries, library tree can now show protected classes, show library items class names as middle ellipses if the class name text is larger, more options via the right click menu for quick usage.

  • ModelWidget: add the partial class as a replaceable component, look for the default component prefixes and name when adding the component.

  • GraphicsView: coordinate system manipulation for icon and diagram layers. Show red box for models that do not exist. Show default graphical annotation for the components that doesn't have any graphical annotations. Better resizing of the components. Properties dialog for primitive shapes i.e Line, Polygon, Rectangle, Ellipse, Text and Bitmap.

  • File Opening: open one or more Modelica files, allow users to select the encoding while opening the file, convert files to UTF-8 encoding, allow users to open the OpenModelica result files.

  • Variables Browser: find variables in the variables browser, sorting in the variables browser.

  • Plot Window: clear all curves of the plot window, preserve the old selected variable and update its value with the new simulation result.

  • Simulation: support for all the simulation flags, read the simulation output as soon as is is obtained, output window for simulations, options to set matching algorithm and index reduction method for simulation. Display all the files generated during the simulation is now supported. Options to set OMC command line flags.

  • Options: options for loading libraries via loadModel and loadFile each time GUI starts, save the last open file directory location, options for setting line wrap mode and syntax highlighting.

  • Modelica Text Editor: preserving user customizations, new search & replace functionality, support for comment/uncomment.

  • Notifications: show custom dialogs to users allowing them to choose whether they want to see this dialog again or not.

  • Model Creation: Better support for creating new classes. Easy creation of extends classes or nested classes.

  • Messages Widget: Multi line error messages are now supported.

  • Crash Detection: The GUI now automatically detects the crash and writes a stack trace file. The user is given an option to send a crash report along with the stack trace file and few other useful files via email.

  • Autosave: OMEdit saves the currently edited model regularly, in order to avoid losing edits after GUI or compiler crash. The save interval can be set in the Options menu.

ModelicaML

  • Enhanced ModelicaML version with support for value bindings in

requirements-driven modeling available for the latest Eclipse and Papyrus versions. GUI specific adaptations. Automated model composition workflows (used for model-based design verification against requirements) are modularized and have improved in terms of performance.

Release Notes for OpenModelica 1.8.1

The OpenModelica 1.8.1 release has a faster and more stable OMC model compiler. It flattens and simulates more models than the previous 1.8.0 version. Significant flattening speedup of the compiler has been achieved for certain large models. It also contains a New ModelicaML version with support for value bindings in requirements-driven modeling and importing Modelica library models into ModelicaML models. A beta version of the new OpenModelica Python scripting is also included. The release was made on 2012-04-03 (r11645).

OpenModelica Compiler (OMC)

This release includes bug fixes and improvements of the flattening frontend part of the OpenModelica Compiler (OMC) and several improvements of the backend, including, but not restricted to:

  • A faster and more stable OMC model compiler. The 1.8.1 version flattens and simulates more models than the previous 1.8.0 version.

  • Support for operator overloading (except Complex numbers).

  • New ModelicaML version with support for value bindings in requirements-driven modeling and importing Modelica library models into ModelicaML models.

  • Faster plotting in OMNotebook. The feature sendData has been removed from OpenModelica. As a result, the kernel no longer depends on Qt. The plot3() family of functions have now replaced to plot(), which in turn have been removed. The non-standard visualize() command has been removed in favour of more recent alternatives.

  • Store OpenModelica documentation as Modelica Documentation annotations.

  • Re-implementation of the simulation runtime using C instead of C++ (this was needed to export FMI source-based packages).

  • FMI import/export bug fixes.

  • Changed the internal representation of various structures to share more memory. This significantly improved the performance for very large models that use records.

  • Faster model flattening, Improved simulation, some graphical API bug fixes.

  • More robust and general initialization, but currently time-consuming.

  • New initialization flags to omc and options to simulate(), to control whether fast or robust initialization is selected, or initialization from an external (.mat) data file.

  • New options to API calls list, loadFile, and more.

  • Enforce the restriction that input arguments of functions may not be assigned to.

  • Improved the scripting environment. cl := $TypeName(Modelica);getClassComment(cl); now works as expected. As does looping over lists of typenames and using reduction expressions.

  • Beta version of Python scripting.

  • Various bugfixes.

  • NOTE: interactive simulation is not operational in this release. It will be put back again in the near future, first available as a nightly build. It is also available in the previous 1.8.0 release.

OpenModelica Notebook (OMNotebook)

  • Faster and more stable plottning.

OpenModelica Shell (OMShell)

  • No changes.

OpenModelica Eclipse Plug-in (MDT)

  • Small fixes and improvements.

OpenModelica Development Environment (OMDev)

  • No changes.

Graphic Editor OMEdit

  • Bug fixes.

OMOptim Optimization Subsystem

  • Bug fixes.

FMI Support

  • Bug fixes.

OpenModelica 1.8.0, November 2011

The OpenModelica 1.8.0 release contains OMC flattening improvements for the Media library - it now flattens the whole library and simulates about 20% of its example models. Moreover, about half of the Fluid library models also flatten. This release also includes two new tool functionalities - the FMI for model exchange import and export, and a new efficient Eclipse-based debugger for Modelica/MetaModelica algorithmic code.

OpenModelica Compiler (OMC)

This release includes bug fixes and improvements of the flattening frontend part of the OpenModelica Compiler (OMC) and several improvements of the backend, including, but not restricted to: A faster and more stable OMC model compiler. The 1.8.0 version flattens and simulates more models than the previous 1.7.0 version.

  • Flattening of the whole Media library, and about half of the Fluid

library. Simulation of approximately 20% of the Media library example models. - Functional Mockup Interface FMI 1.0 for model exchange, export and import, for the Windows platform. - Bug fixes in the OpenModelica graphical model connection editor OMEdit, supporting easy-to-use graphical drag-and-drop modeling and MSL 3.1. - Bug fixes in the OMOptim optimization subsystem. - Beta version of compiler support for a new Eclipse-based very efficient algorithmic code debugger for functions in MetaModelica/Modelica, available in the development environment when using the bootstrapped OpenModelica compiler. - Improvements in initialization of simulations. - Improved index reduction with dynamic state selection, which improves simulation. - Better error messages from several parts of the compiler, including a new API call for giving better error messages. - Automatic partitioning of equation systems and multi-core parallel simulation of independent parts based on the shared-memory OpenMP model. This version is a preliminary experimental version without load balancing.

OpenModelica Notebook (OMNotebook)

No changes.

OpenModelica Shell (OMShell)

Small performance improvements.

OpenModelica Eclipse Plug-in (MDT)

Small fixes and improvements. MDT now also includes a beta version of a new Eclipse-based very efficient algorithmic code debugger for functions in MetaModelica/Modelica.

OpenModelica Development Environment (OMDev)

Third party binaries, including Qt libraries and executable Qt clients, are now part of the OMDev package. Also, now uses GCC 4.4.0 instead of the earlier GCC 3.4.5.

Graphic Editor OMEdit

Bug fixes. Access to FMI Import/Export through a pull-down menu. Improved configuration of library loading. A function to go to a specific line number. A button to cancel an on-going simulation. Support for some updated OMC API calls.

New OMOptim Optimization Subsystem

Bug fixes, especially in the Linux version.

FMI Support

The Functional Mockup Interface FMI 1.0 for model exchange import and export is supported by this release. The functionality is accessible via API calls as well as via pull-down menu commands in OMEdit.

OpenModelica 1.7.0, April 2011

The OpenModelica 1.7.0 release contains OMC flattening improvements for the Media library, better and faster event handling and simulation, and fast MetaModelica support in the compiler, enabling it to compiler itself. This release also includes two interesting new tools – the OMOptim optimization subsystem, and a new performance profiler for equation-based Modelica models.

OpenModelica Compiler (OMC)

This release includes bug fixes and performance improvements of the flattening frontend part of the OpenModelica Compiler (OMC) and several improvements of the backend, including, but not restricted to:

  • Flattening of the whole Modelica Standard Library 3.1 (MSL 3.1),

except Media and Fluid. - Progress in supporting the Media library, some models now flatten. - Much faster simulation of many models through more efficient handling of alias variables, binary output format, and faster event handling. - Faster and more stable simulation through new improved event handling, which is now default. - Simulation result storage in binary .mat files, and plotting from such files. - Support for Unicode characters in quoted Modelica identifiers, including Japanese and Chinese. - Preliminary MetaModelica 2.0 support. (use setCommandLineOptions({"+g=MetaModelica"}) ). Execution is as fast as MetaModelica 1.0, except for garbage collection. - Preliminary bootstrapped OpenModelica compiler: OMC now compiles itself, and the bootstrapped compiler passes the test suite. A garbage collector is still missing. - Many bug fixes.

OpenModelica Notebook (OMNotebook)

Improved much faster and more stable 2D plotting through the new OMPlot module. Plotting from binary .mat files. Better integration between OMEdit and OMNotebook, copy/paste between them.

OpenModelica Shell (OMShell)

Same as previously, except the improved 2D plotting through OMPlot.

Graphic Editor OMEdit

Several enhancements of OMEdit are included in this release. Support for Icon editing is now available. There is also an improved much faster 2D plotting through the new OMPlot module. Better integration between OMEdit and OMNotebook, with copy/paste between them. Interactive on-line simulation is available in an easy-to-use way.

New OMOptim Optimization Subsystem

A new optimization subsystem called OMOptim has been added to OpenModelica. Currently, parameter optimization using genetic algorithms is supported in this version 0.9. Pareto front optimization is also supported.

New Performance Profiler

A new, low overhead, performance profiler for Modelica models has been developed.

OpenModelica 1.6.0, November 2010

The OpenModelica 1.6.0 release primarily contains flattening, simulation, and performance improvements regarding Modelica Standard Library 3.1 support, but also has an interesting new tool – the OMEdit graphic connection editor, and a new educational material called DrControl, and an improved ModelicaML UML/Modelica profile with better support for modeling and requirement handling.

OpenModelica Compiler (OMC)

This release includes bug fix and performance improvemetns of the flattening frontend part of the OpenModelica Compiler (OMC) and some improvements of the backend, including, but not restricted to:

  • Flattening of the whole Modelica Standard Library 3.1 (MSL 3.1),

except Media and Fluid. - Improved flattening speed of a factor of 5-20 compared to OpenModelica 1.5 for a number of models, especially in the MultiBody library. - Reduced memory consumption by the OpenModelica compiler frontend, for certain large models a reduction of a factor 50. - Reorganized, more modular OpenModelica compiler backend, can now handle approximately 30 000 equations, compared to previously approximately 10 000 equations. - Better error messages from the compiler, especially regarding functions. - Improved simulation coverage of MSL 3.1. Many models that did not simulate before are now simulating. However, there are still many models in certain sublibraries that do not simulate. - Progress in supporting the Media library, but simulation is not yet possible. - Improved support for enumerations, both in the frontend and the backend. - Implementation of stream connectors. - Support for linearization through symbolic Jacobians. - Many bug fixes.

OpenModelica Notebook (OMNotebook)

A new DrControl electronic notebook for teaching control and modeling with Modelica.

OpenModelica Development Environment (OMDev)

Several enhancements. Support for match-expressions in addition to matchcontinue. Support for real if-then-else. Support for if-then without else-branches. Modelica Development Tooling 0.7.7 with small improvements such as more settings, improved error detection in console, etc.

New Graphic Editor OMEdit

A new improved open source graphic model connection editor called OMEdit, supporting 3.1 graphical annotations, which makes it possible to move models back and forth to other tools without problems. The editor has been implemented by students at Linköping University and is based on the C++ Qt library.

OpenModelica 1.5.0, July 2010

This OpenModelica 1.5 release has major improvements in the OpenModelica compiler frontend and some in the backend. A major improvement of this release is full flattening support for the MultiBody library as well as limited simulation support for MultiBody. Interesting new facilities are the interactive simulation and the integrated UML-Modelica modeling with ModelicaML. Approximately 4 person-years of additional effort have been invested in the compiler compared to the 1.4.5 version, e.g., in order to have a more complete coverage of Modelica 3.0, mainly focusing on improved flattening in the compiler frontend.

OpenModelica Compiler (OMC)

This release includes major improvements of the flattening frontend part of the OpenModelica Compiler (OMC) and some improvements of the backend, including, but not restricted to:

  • Improved flattening speed of at least a factor of 10 or more compared

to the 1.4.5 release, primarily for larger models with inner-outer, but also speedup for other models, e.g. the robot model flattens in approximately 2 seconds. - Flattening of all MultiBody models, including all elementary models, breaking connection graphs, world object, etc. Moreover, simulation is now possible for at least five MultiBody models: Pendulum, DoublePendulum, InitSpringConstant, World, PointGravityWithPointMasses. - Progress in supporting the Media library, but simulation is not yet possible. - Support for enumerations, both in the frontend and the backend. - Support for expandable connectors. - Support for the inline and late inline annotations in functions. - Complete support for record constructors, also for records containing other records. - Full support for iterators, including nested ones. - Support for inferred iterator and for-loop ranges. - Support for the function derivative annotation. - Prototype of interactive simulation. - Prototype of integrated UML-Modelica modeling and simulation with ModelicaML. - A new bidirectional external Java interface for calling external Java functions, or for calling Modelica functions from Java. - Complete implementation of replaceable model extends. - Fixed problems involving arrays of unknown dimensions. - Limited support for tearing. - Improved error handling at division by zero. - Support for Modelica 3.1 annotations. - Support for all MetaModelica language constructs inside OpenModelica. - OpenModelica works also under 64-bit Linux and Mac 64-bit OSX. - Parallel builds and running test suites in parallel on multi-core platforms. - New OpenModelica text template language for easier implementation of code generators, XML generators, etc. - New OpenModelica code generators to C and C# using the text template language. - Faster simulation result data file output optionally as comma-separated values. - Many bug fixes.

It is now possible to graphically edit models using parts from the Modelica Standard Library 3.1, since the simForge graphical editor (from Politecnico di Milano) that is used together with OpenModelica has been updated to version 0.9.0 with a important new functionality, including support for Modelica 3.1 and 3.0 annotations. The 1.6 and 2.2.1 Modelica graphical annotation versions are still supported.

OpenModelica Notebook (OMNotebook)

Improvements in platform availability.

  • Support for 64-bit Linux. - Support for Windows 7. - Better support

for MacOS, including 64-bit OSX.

OpenModelica 1.4.5, January 2009

This release has several improvements, especially platform availability, less compiler memory usage, and supporting more aspects of Modelica 3.0.

OpenModelica Compiler (OMC)

This release includes small improvements and some bugfixes of the OpenModelica Compiler (OMC):

  • Less memory consumption and better memory management over time. This

also includes a better API supporting automatic memory management when calling C functions from within the compiler. - Modelica 3.0 parsing support. - Export of DAE to XML and MATLAB. - Support for several platforms Linux, MacOS, Windows (2000, Xp, Vista). - Support for record and strings as function arguments. - Many bug fixes. - (Not part of OMC): Additional free graphic editor SimForge can be used with OpenModelica.

OpenModelica Notebook (OMNotebook)

A number of improvements, primarily in the plotting functionality and platform availability.

  • A number of improvements in the plotting functionality: scalable

plots, zooming, logarithmic plots, grids, etc. - Programmable plotting accessible through a Modelica API. - Simple 3D visualization. - Support for several platforms Linux, MacOS, Windows (2000, Xp, Vista).

OpenModelica 1.4.4, Feb 2008

This release is primarily a bug fix release, except for a preliminary version of new plotting functionality available both from the OMNotebook and separately through a Modelica API. This is also the first release under the open source license OSMC-PL (Open Source Modelica Consortium Public License), with support from the recently created Open Source Modelica Consortium. An integrated version handler, bug-, and issue tracker has also been added.

OpenModelica Compiler (OMC)

This release includes small improvements and some bugfixes of the OpenModelica Compiler (OMC):

  • Better support for if-equations, also inside when. - Better support

for calling functions in parameter expressions and interactively through dynamic loading of functions. - Less memory consumtion during compilation and interactive evaluation. - A number of bug-fixes.

OpenModelica Notebook (OMNotebook)

Test release of improvements, primarily in the plotting functionality and platform availability.

  • Preliminary version of improvements in the plotting functionality:

scalable plots, zooming, logarithmic plots, grids, etc., currently available in a preliminary version through the plot2 function. - Programmable plotting accessible through a Modelica API.

OpenModelica Eclipse Plug-in (MDT)

This release includes minor bugfixes of MDT and the associated MetaModelica debugger.

OpenModelica Development Environment (OMDev)

Extended test suite with a better structure. Version handling, bug tracking, issue tracking, etc. now available under the integrated Codebeamer.

OpenModelica 1.4.3, June 2007

This release has a number of significant improvements of the OMC compiler, OMNotebook, the MDT plugin and the OMDev. Increased platform availability now also for Linux and Macintosh, in addition to Windows. OMShell is the same as previously, but now ported to Linux and Mac.

OpenModelica Compiler (OMC)

This release includes a number of improvements of the OpenModelica Compiler (OMC):

  • Significantly increased compilation speed, especially with large

models and many packages. - Now available also for Linux and Macintosh platforms. - Support for when-equations in algorithm sections, including elsewhen. - Support for inner/outer prefixes of components (but without type error checking). - Improved solution of nonlinear systems. - Added ability to compile generated simulation code using Visual Studio compiler. - Added "smart setting of fixed attribute to false. If initial equations, OMC instead has fixed=true as default for states due to allowing overdetermined initial equation systems. - Better state select heuristics. - New function getIncidenceMatrix(ClassName) for dumping the incidence matrix. - Builtin functions String(), product(), ndims(), implemented. - Support for terminate() and assert() in equations. - In emitted flat form: protected variables are now prefixed with protected when printing flat class. - Some support for tables, using omcTableTimeIni instead of dymTableTimeIni2. - Better support for empty arrays, and support for matrix operations like a*[1,2;3,4]. - Improved val() function can now evaluate array elements and record fields, e.g. val(x[n]), val(x.y) . - Support for reinit in algorithm sections. - String support in external functions. - Double precision floating point precision now also for interpreted expressions - Better simulation error messages. - Support for der(expressions). - Support for iterator expressions such as {3*i for i in 1..10}. - More test cases in the test suite. - A number of bug fixes, including sample and event handling bugs.

OpenModelica Notebook (OMNotebook)

A number of improvements, primarily in the platform availability.

  • Available on the Linux and Macintosh platforms, in addition to

Windows. - Fixed cell copying bugs, plotting of derivatives now works, etc.

OpenModelica Shell (OMShell)

Now available also on the Macintosh platform.

OpenModelica Eclipse Plug-in (MDT)

This release includes major improvements of MDT and the associated MetaModelica debugger:

  • Greatly improved browsing and code completion works both for standard

Modelica and for MetaModelica. - Hovering over identifiers displays type information. - A new and greatly improved implementation of the debugger for MetaModelica algorithmic code, operational in Eclipse. Greatly improved performance - only approx 10% speed reduction even for 100 000 line programs. Greatly improved single stepping, step over, data structure browsing, etc. - Many bug fixes.

OpenModelica Development Environment (OMDev)

Increased compilation speed for MetaModelica. Better if-expression support in MetaModelica.

OpenModelica 1.4.2, October 2006

This release has improvements and bug fixes of the OMC compiler, OMNotebook, the MDT plugin and the OMDev. OMShell is the same as previously.

OpenModelica Compiler (OMC)

This release includes further improvements of the OpenModelica Compiler (OMC):

  • Improved initialization and index reduction. - Support for integer

arrays is now largely implemented. - The val(variable,time) scripting function for accessing the value of a simulation result variable at a certain point in the simulated time. - Interactive evalution of for-loops, while-loops, if-statements, if-expressions, in the interactive scripting mode. - Improved documentation and examples of calling the Model Query and Manipulation API. - Many bug fixes.

OpenModelica Notebook (OMNotebook)

Search and replace functions have been added. The DrModelica tutorial (all files) has been updated, obsolete sections removed, and models which are not supported by the current implementation marked clearly. Automatic recognition of the .onb suffix (e.g. when double-clicking) in Windows makes it even more convenient to use.

OpenModelica Eclipse Plug-in (MDT)

Two major improvements are added in this release:

  • Browsing and code completion works both for standard Modelica and for

MetaModelica. - The debugger for algorithmic code is now available and operational in Eclipse for debugging of MetaModelica programs.

OpenModelica 1.4.1, June 2006

This release has only improvements and bug fixes of the OMC compiler, the MDT plugin and the OMDev components. The OMShell and OMNotebook are the same.

OpenModelica Compiler (OMC)

This release includes further improvements of the OpenModelica Compiler (OMC):

  • Support for external objects. - OMC now reports the version number

(via command line switches or CORBA API getVersion()). - Implemented caching for faster instantiation of large models. - Many bug fixes.

OpenModelica Eclipse Plug-in (MDT)

Improvements of the error reporting when building the OMC compiler. The errors are now added to the problems view. The latest MDT release is version 0.6.6 (2006-06-06).

OpenModelica Development Environment (OMDev)

Small fixes in the MetaModelica compiler. MetaModelica Users Guide is now part of the OMDev release. The latest OMDev was release in 2006-06-06.

OpenModelica 1.4.0, May 2006

This release has a number of improvements described below. The most significant change is probably that OMC has now been translated to an extended subset of Modelica (MetaModelica), and that all development of the compiler is now done in this version..

OpenModelica Compiler (OMC)

This release includes further improvements of the OpenModelica Compiler (OMC):

  • Partial support for mixed system of equations. - New initialization

routine, based on optimization (minimizing residuals of initial equations). - Symbolic simplification of builtin operators for vectors and matrices. - Improved code generation in simulation code to support e.g. Modelica functions. - Support for classes extending basic types, e.g. connectors (support for MSL 2.2 block connectors). - Support for parametric plotting via the plotParametric command. - Many bug fixes.

OpenModelica Shell (OMShell)

Essentially the same OMShell as in 1.3.1. One difference is that now all error messages are sent to the command window instead of to a separate log window.

OpenModelica Notebook (OMNotebook)

Many significant improvements and bug fixes. This version supports graphic plots within the cells in the notebook. Improved cell handling and Modelica code syntax highlighting. Command completion of the most common OMC commands is now supported. The notebook has been used in several courses.

OpenModelica Eclipse Plug-in (MDT)

This is the first really useful version of MDT. Full browsing of Modelica code, e.g. the MSL 2.2, is now supported. (MetaModelica browsing is not yet fully supported). Full support for automatic indentation of Modelica code, including the MetaModelica extensions. Many bug fixes. The Eclipse plug-in is now in use for OpenModelica development at PELAB and MathCore Engineering AB since approximately one month.

OpenModelica Development Environment (OMDev)

The following mechanisms have been put in place to support OpenModelica development.

  • A separate web page for OMDev (OpenModelica Development Environment).

  • A pre-packaged OMDev zip-file with precompiled binaries for

development under Windows using the mingw Gnu compiler from the Eclipse MDT plug-in. (Development is also possible using Visual Studio). - All source code of the OpenModelica compiler has recently been translated to an extended subset of Modelica, currently called MetaModelica. The current size of OMC is approximately 100 000 lines All development is now done in this version. - A new tutorial and users guide for development in MetaModelica. - Successful builds and tests of OMC under Linux and Solaris.

OpenModelica 1.3.1, November 2005

This release has several important highlights.

This is also the *first* release for which the New BSD (Berkeley) open-source license applies to the source code, including the whole compiler and run-time system. This makes is possible to use OpenModelica for both academic and commercial purposes without restrictions.

OpenModelica Compiler (OMC)

This release includes a significantly improved OpenModelica Compiler (OMC):

  • Support for hybrid and discrete-event simulation (if-equations,

if-expressions, when-equations; not yet if-statements and when-statements). - Parsing of full Modelica 2.2 - Improved support for external functions. - Vectorization of function arguments; each-modifiers, better implementation of replaceable, better handling of structural parameters, better support for vector and array operations, and many other improvements. - Flattening of the Modelica Block library version 1.5 (except a few models), and simulation of most of these. - Automatic index reduction (present also in previous release). - Updated User's Guide including examples of hybrid simulation and external functions.

OpenModelica Shell (OMShell)

An improved window-based interactive command shell, now including command completion and better editing and font size support.

OpenModelica Notebook (OMNotebook)

A free implementation of an OpenModelica notebook (OMNotebook), for electronic books with course material, including the DrModelica interactive course material. It is possible to simulate and plot from this notebook.

OpenModelica Eclipse Plug-in (MDT)

An early alpha version of the first Eclipse plug-in (called MDT for Modelica Development Tooling) for Modelica Development. This version gives compilation support and partial support for browsing Modelica package hierarchies and classes.

OpenModelica Development Environment (OMDev)

The following mechanisms have been put in place to support OpenModelica development.

  • Bugzilla support for OpenModelica bug tracking, accessible to anybody.

  • A system for automatic regression testing of the compiler and

simulator, (+ other system parts) usually run at check in time. - Version handling is done using SVN, which is better than the previously used CVS system. For example, name change of modules is now possible within the version handling system.