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Update basix.ufl.mixed_element factory function for case of a single element #882

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Update basix.ufl.mixed_element factory function for case of a single element #882

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726516f
Update Basix for mixed elements
garth-wells Nov 19, 2024
ad38d3a
Typing update
garth-wells Nov 19, 2024
679bce7
Fix typo
garth-wells Nov 19, 2024
a2f6235
Remove single dispatch
garth-wells Nov 19, 2024
fbb37f8
Logic fix
garth-wells Nov 19, 2024
4e5c218
Test fix
garth-wells Nov 19, 2024
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7 changes: 5 additions & 2 deletions python/basix/ufl.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2229,12 +2229,15 @@ def mixed_element(elements: list[_ElementBase]) -> _ElementBase:
"""Create a UFL compatible mixed element from a list of elements.

Args:
elements: The list of elements
elements: List of elements.

Returns:
A mixed finite element.
"""
return _MixedElement(elements)
if len(elements) > 1:
return _MixedElement(elements)
else:
return elements[0]


def quadrature_element(
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12 changes: 12 additions & 0 deletions test/test_ufl_wrapper.py
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Expand Up @@ -98,11 +98,23 @@ def test_enriched_element(elements):
"e,space0,space1",
[
(basix.ufl.element("Lagrange", basix.CellType.triangle, 2), "H1", basix.SobolevSpace.H1),
(
basix.ufl.mixed_element([basix.ufl.element("Lagrange", basix.CellType.triangle, 2)]),
"H1",
basix.SobolevSpace.H1,
),
(
basix.ufl.element("Discontinuous Lagrange", basix.CellType.triangle, 0),
"L2",
basix.SobolevSpace.L2,
),
(
basix.ufl.mixed_element(
[basix.ufl.element("Discontinuous Lagrange", basix.CellType.triangle, 0)]
),
"L2",
basix.SobolevSpace.L2,
),
(
basix.ufl.mixed_element(
[
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