# `opensees`
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**A *fast* and *stateless* interface to the OpenSees framework for finite element analysis.**
<br>
<br>
<div style="align:center">
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[](https://anaconda.org/conda-forge/opensees)
-->
<!-- [![PyPI Downloads][pypi-v-image]][pypi-v-link] -->
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This is an experimental package that provides an *optimized* OpenSees Tcl interpreter,
as well as a new set of Python bindings that is both idiomatic, and free
of global state.
The package may be used as a drop-in replacement for both OpenSees.exe and
OpenSeesPy (see *Getting Started* below), and generally provides a substantial performance boost.
Project objectives include:
- **Performance** The `opensees` package uses the experimental
[`OpenSeesRT`](https://github.com/claudioperez/OpenSeesRT)
analysis kernel which
eliminates reliance on global variables for state and memory management.
New template classes in [`matrix/`](https://github.com/STAIRLab/OpenSeesRT/tree/master/SRC/matrix/)
allow for stack-allocated
matrices and vectors and eliminate the need for static local variables
which is leveraged to furnish substantial performance improvements.
Switching Python scripts
to use `opensees` typically results in a 4x to 5x performance boost.
- **Reliability** The core OpenSees runtime has been redesigned so that all program
state is encapsulated in user-instantiated classes,
and global variables/singletons are avoided.
This eliminates several preexisting vulnerabilities to inadvertent state corruption.
- **Semantics** ... <!-- Unlike interfaces which rely on global state, this package can be used
with true library semantics. -->
<!--
- **Library semantics**
-->
Additional features include:
- Convert OpenSeesPy scripts into equivalent Tcl files that can be used
for faster processing or serialization. Unlike most conversion utilities,
this conversion is done *exactly* and does not rely on hand-rolled parsing.
- The package can be installed with `pip` for Python versions 3.7 - 3.12 on Linux, MacOS and
Windows, but eigenvalue analysis is currently broken on Windows.
> [!NOTE]
> This package is independent of the [`openseespy`](https://pypi.org/project/openseespy)
> library, which is documented in the OpenSees [documentation](https://opensees.github.io/OpenSeesDocumentation)
> website.
<p style="text-align: center;">
<b>This package is <i>experimental</i> and not yet intended for public use.</b>
</p>
### Getting Started
- To start a Tcl interpreter run the shell command:
```bash
python -m opensees
```
- The `opensees` package exposes a compatibility layer that exactly reproduces
the original *OpenSeesPy* functions, but does so without mandating a single
global program state. To run OpenSeesPy scripts, just change the import:
```python
import openseespy.opensees
```
to
```python
import opensees.openseespy
```
For true stateless modeling, the `Model` class should be used instead of the legacy
`model` function; documentation is under development.
<!-- Badge links -->
[pypi-d-image]: https://img.shields.io/pypi/dm/opensees.svg
[license-badge]: https://img.shields.io/pypi/l/opensees.svg
[pypi-d-link]: https://pypi.org/project/opensees
[pypi-v-image]: https://img.shields.io/pypi/v/opensees.svg
[pypi-v-link]: https://pypi.org/project/opensees
See also:
- [`osmg`](https://pypi.org/project/osmg) OpenSees Model Generator
- [`sees`](https://pypi.org/project/sees) Modern rendering library
- [`mdof`](https://pypi.org/project/mdof) Optimized system identification library
- [`sdof`](https://pypi.org/project/sdof) Optimized integration for single degree of freedom systems
For more projects by the STAIRlab, visit https://github.com/STAIRlab .
## Support
<table align="center" style="border: 0;">
<tr style="background-color:rgba(0, 0, 0, 0);">
<td style="background-color:rgba(0, 0, 0, 0);" colspan="3">
<a>
<img src="https://raw.githubusercontent.com/claudioperez/opensees/master/docs/figures/opensees.svg"
width="600" alt="OpenSeesRT Logo">
</a>
</td>
</tr>
<tr>
<td>
<a href="https://peer.berkeley.edu">
<img src="https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/peer-black-300.png"
alt="PEER Logo" width="200"/>
</a>
</td>
<td>
<a href="https://dot.ca.gov/">
<img src="https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/Caltrans.svg.png"
alt="Caltrans Logo" width="200"/>
</a>
</td>
<td>
<a href="https://brace2.herokuapp.com">
<img src="https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/stairlab.svg"
alt="BRACE2 Logo" width="200"/>
</a>
</td>
</tr>
</table>
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"author": "Claudio M. Perez",
"author_email": null,
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"description": "# `opensees`\n\n\n\n<!--\n<img align=\"center\" src=\"https://raw.githubusercontent.com/BRACE2/OpenSeesRT/master/docs/figures/banner.png\" width=\"150px\" alt=\"OpenSees\">\n-->\n\n<img align=\"left\" src=\"https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/peer-black-300.png\" width=\"150px\" alt=\"PEER Logo\">\n\n\n**A *fast* and *stateless* interface to the OpenSees framework for finite element analysis.**\n\n<br>\n\n\n<br>\n\n<div style=\"align:center\">\n\n<!--\n[](https://anaconda.org/conda-forge/opensees)\n-->\n\n<!-- [![PyPI Downloads][pypi-v-image]][pypi-v-link] -->\n\n[](https://pypi.python.org/pypi/opensees)\n[](https://anaconda.org/opensees/opensees)\n[](https://pypi.org/project/opensees)\n\n</div>\n\n<!-- \n-------------------------------------------------------------------- \n-->\n\nThis is an experimental package that provides an *optimized* OpenSees Tcl interpreter,\nas well as a new set of Python bindings that is both idiomatic, and free\nof global state.\n\nThe package may be used as a drop-in replacement for both OpenSees.exe and\nOpenSeesPy (see *Getting Started* below), and generally provides a substantial performance boost.\nProject objectives include:\n\n- **Performance** The `opensees` package uses the experimental \n [`OpenSeesRT`](https://github.com/claudioperez/OpenSeesRT) \n analysis kernel which\n eliminates reliance on global variables for state and memory management. \n New template classes in [`matrix/`](https://github.com/STAIRLab/OpenSeesRT/tree/master/SRC/matrix/)\n allow for stack-allocated\n matrices and vectors and eliminate the need for static local variables \n which is leveraged to furnish substantial performance improvements. \n Switching Python scripts\n to use `opensees` typically results in a 4x to 5x performance boost.\n\n- **Reliability** The core OpenSees runtime has been redesigned so that all program \n state is encapsulated in user-instantiated classes,\n and global variables/singletons are avoided. \n This eliminates several preexisting vulnerabilities to inadvertent state corruption.\n\n- **Semantics** ... <!-- Unlike interfaces which rely on global state, this package can be used \n with true library semantics. -->\n\n<!--\n- **Library semantics**\n-->\n\nAdditional features include:\n\n- Convert OpenSeesPy scripts into equivalent Tcl files that can be used\n for faster processing or serialization. Unlike most conversion utilities,\n this conversion is done *exactly* and does not rely on hand-rolled parsing.\n\n- The package can be installed with `pip` for Python versions 3.7 - 3.12 on Linux, MacOS and\n Windows, but eigenvalue analysis is currently broken on Windows.\n\n> [!NOTE]\n> This package is independent of the [`openseespy`](https://pypi.org/project/openseespy)\n> library, which is documented in the OpenSees [documentation](https://opensees.github.io/OpenSeesDocumentation)\n> website.\n\n\n<p style=\"text-align: center;\">\n<b>This package is <i>experimental</i> and not yet intended for public use.</b>\n</p>\n\n\n### Getting Started\n\n- To start a Tcl interpreter run the shell command:\n\n ```bash\n python -m opensees\n ```\n\n- The `opensees` package exposes a compatibility layer that exactly reproduces\n the original *OpenSeesPy* functions, but does so without mandating a single\n global program state. To run OpenSeesPy scripts, just change the import:\n ```python\n import openseespy.opensees\n ```\n to\n ```python\n import opensees.openseespy\n ```\n For true stateless modeling, the `Model` class should be used instead of the legacy\n `model` function; documentation is under development.\n\n\n<!-- Badge links -->\n\n[pypi-d-image]: https://img.shields.io/pypi/dm/opensees.svg\n[license-badge]: https://img.shields.io/pypi/l/opensees.svg\n[pypi-d-link]: https://pypi.org/project/opensees\n[pypi-v-image]: https://img.shields.io/pypi/v/opensees.svg\n[pypi-v-link]: https://pypi.org/project/opensees\n\n\nSee also:\n\n- [`osmg`](https://pypi.org/project/osmg) OpenSees Model Generator\n- [`sees`](https://pypi.org/project/sees) Modern rendering library\n- [`mdof`](https://pypi.org/project/mdof) Optimized system identification library\n- [`sdof`](https://pypi.org/project/sdof) Optimized integration for single degree of freedom systems\n\nFor more projects by the STAIRlab, visit https://github.com/STAIRlab .\n\n## Support\n\n<table align=\"center\" style=\"border: 0;\">\n <tr style=\"background-color:rgba(0, 0, 0, 0);\">\n <td style=\"background-color:rgba(0, 0, 0, 0);\" colspan=\"3\">\n <a>\n <img src=\"https://raw.githubusercontent.com/claudioperez/opensees/master/docs/figures/opensees.svg\" \n width=\"600\" alt=\"OpenSeesRT Logo\">\n </a>\n </td>\n </tr>\n\n<tr>\n <td>\n <a href=\"https://peer.berkeley.edu\">\n <img src=\"https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/peer-black-300.png\"\n alt=\"PEER Logo\" width=\"200\"/>\n </a>\n </td>\n\n <td>\n <a href=\"https://dot.ca.gov/\">\n <img src=\"https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/Caltrans.svg.png\"\n alt=\"Caltrans Logo\" width=\"200\"/>\n </a>\n </td>\n\n <td>\n <a href=\"https://brace2.herokuapp.com\">\n <img src=\"https://raw.githubusercontent.com/claudioperez/sdof/master/docs/assets/stairlab.svg\"\n alt=\"BRACE2 Logo\" width=\"200\"/>\n </a>\n </td>\n \n </tr>\n</table>\n\n",
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