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Default degree 3 quadrature on triangle inefficient? #27

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chrisrichardson opened this issue Jul 26, 2016 · 3 comments
Open

Default degree 3 quadrature on triangle inefficient? #27

chrisrichardson opened this issue Jul 26, 2016 · 3 comments
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enhancement minor

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@chrisrichardson
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Original report by Miklós Homolya (Bitbucket: miklos1, GitHub: miklos1).

FIAT has generic rules for generating arbitrary order collapsed quadrature on triangles and tetrahedra ("canonical"). It also has a few hand-written rules for low-order quadrature on triangles and tetrahedra ("default"), which are presumably more efficient. The default rules indeed have fewer quadrature points than the canonical ones in all cases except one: degree 3 quadrature on the triangle.

The default scheme uses 6-point quadrature in this case, while the canonical scheme only uses 2 x 2 = 4 points.
@chrisrichardson
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Original comment by Jan Blechta (Bitbucket: blechta, GitHub: blechta).

Fix in branch jan/fix-issue-27 and next.

@chrisrichardson
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Original comment by Jan Blechta (Bitbucket: blechta, GitHub: blechta).

Fixed by 8ceb29a

@chrisrichardson
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Original comment by Jan Blechta (Bitbucket: blechta, GitHub: blechta).

Issue #28 was marked as a duplicate of this issue.

@chrisrichardson chrisrichardson mentioned this issue Jun 10, 2019
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