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Clarify usage of pow and abs #286

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May 21, 2024
Merged

Clarify usage of pow and abs #286

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12 changes: 6 additions & 6 deletions .github/workflows/fenicsx-tests.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -22,15 +22,15 @@ jobs:
- name: Set up Python
uses: actions/setup-python@v5
with:
python-version: 3.9
python-version: 3.12

- name: Install test dependencies
run: |
sudo apt-get install -y graphviz libgraphviz-dev ninja-build pkg-config

- name: Install UFL
run: |
pip3 install .
pip3 install --break-system-packages .

- name: Install Basix
run: |
Expand Down Expand Up @@ -65,12 +65,12 @@ jobs:

- name: Install UFL
run: |
pip3 install .
pip3 install --break-system-packages .

- name: Install Basix and FFCx
run: |
python3 -m pip install git+https://github.com/FEniCS/basix.git
python3 -m pip install git+https://github.com/FEniCS/ffcx.git
python3 -m pip install --break-system-packages git+https://github.com/FEniCS/basix.git
python3 -m pip install --break-system-packages git+https://github.com/FEniCS/ffcx.git

- name: Clone DOLFINx
uses: actions/checkout@v4
Expand All @@ -83,6 +83,6 @@ jobs:
cmake -G Ninja -DCMAKE_BUILD_TYPE=Developer -B build -S dolfinx/cpp/
cmake --build build
cmake --install build
python3 -m pip -v install --no-build-isolation --check-build-dependencies --config-settings=cmake.build-type="Developer" dolfinx/python/
python3 -m pip -v install --break-system-packages --no-build-isolation --check-build-dependencies --config-settings=cmake.build-type="Developer" dolfinx/python/
- name: Run DOLFINx unit tests
run: python3 -m pytest -n auto dolfinx/python/test/unit
13 changes: 10 additions & 3 deletions doc/sphinx/source/manual/form_language.rst
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Expand Up @@ -764,11 +764,10 @@ Basic nonlinear functions
Some basic nonlinear functions are also available, their meaning mostly
obvious.

* ``abs(f)``: the absolute value of f.
The following functions are defined and should be imported from `ufl`

* ``sign(f)``: the sign of f (+1 or -1).

* ``pow(f, g)`` or ``f**g``: f to the power g, :math:`f^g`
* ``sign(f)``: the sign of f (+1 or -1).

* ``sqrt(f)``: square root, :math:`\sqrt{f}`

Expand Down Expand Up @@ -806,6 +805,14 @@ obvious.

* ``bessel_K(nu, f)``: Modified Bessel function of the second kind, :math:`K_\nu(f)`

while the following Python built in functions can be used without an import statement

* ``abs(f)``: the absolute value of f.


* ``pow(f, g)`` or ``f**g``: f to the power g, :math:`f^g`


These functions do not accept non-scalar operands or operands with free
indices or ``Argument`` dependencies.

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