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MakisH merged 2 commits into from
Mar 9, 2026
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Nutils adapter: Document scipy backend option #841

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Nutils adapter: Document scipy backend option
MakisH Mar 9, 2026
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Merge branch 'master' into MakisH-patch-6
MakisH Mar 9, 2026
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2 changes: 2 additions & 0 deletions content/docs/adapters/nutils/adapter-nutils.md
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Expand Up @@ -18,3 +18,5 @@ The best way to learn how to couple a [Nutils](http://www.nutils.org/) applicati
We recommend using a Python virtual environment to install different Nutils versions. See the `requirements.txt` and the `run.sh` of the cases included in the preCICE tutorials for an example.

Version 8 requires `bottombar` as a dependency. `pip` might automatically install version `2.0`, which has [known issues](https://github.com/precice/precice/issues/1443) when used with preCICE. A [patch](https://github.com/evalf/bottombar/commit/fd2dc3a76db282e5ba1f12047683100a299cf651) was implemented in version `2.1`, thus a workaround is to explicitly re-install version `2.1`: `pip3 install bottombar==2.1` (in the same [virtual environment](https://docs.python.org/3/library/venv.html#creating-virtual-environments)).

In case you get an error `nutils.Matrix.MatrixError: reordering problem`, this might be an issue with the [solver backend](https://nutils.org/install-matrix.html) on your system. In that case, try setting `NUTILS_MATRIX=scipy` before calling the respective Nutils solver (requires installing the Python package `scipy`).