Add basic operations for row/column reductions in matrix objects #4517
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lib/matobj.gi
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| # Checks | ||
| if not( 0 < row and row <= NrRows(mat) ) then | ||
| ErrorNoReturn("the second argument <row> has to fulfill 0 < row <= NrRows(mat) "); | ||
| fi; |
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According to Codecov, this function is lacking tests
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So far, we have only written tests for SwapMatrixRows and SwapMatrixColumns. We plan to also write tests for all other functions that we added.
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Tests for all functions have been added.
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It seems like GAP is always using the "IsRowListMatrix" functions. Is there a way to define a matrix object which is not a "RowListMatrix"?
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Good question. In the end, this is what IsPlistMatrixRep (or perhaps IsStrictPlistMatrixRep) should do; see PR #2973 . It shouldn't be hard to do that atop the mentioned PR.
Co-authored-by: Max Horn <max@quendi.de>
Co-authored-by: Max Horn <max@quendi.de>
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The commit e334988 produced an error. Therefore, the old code of the "SwapMatrixRows" function is used again.
lib/matobjplist.gi
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| temp := mat[row1]; | ||
| mat[row1] := mat[row2]; | ||
| mat[row2] := temp; | ||
| mat{[row1,row2]} := mat{[row2,row1]}; | ||
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This gives us an error:
Error, List Assignments: <rhss> must be a dense list (not a positional object) in
mat{[ row1, row2 ]} := mat{[ row2, row1 ]}; at .../GAP/gap/lib/matobjplist.gi:1351 called from
<function "SwapMatrixRows for a mutable IsRowListMatrix, one row number, second row number">( <arguments> )
called from read-eval loop at *stdin*:6
type 'quit;' to quit to outer loop
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This problem shows a bug in GAP, see issue #4533.
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kind: enhancement
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release notes: use title
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At the moment some functions cannot be tested because we don't have a MatrixObj which is not a IsRowListMatrix. Everything else should be finished (A little bit disappointed because of the slow performance mentioned in #3962 ). |
The slow performance is only for |
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PR #4557 may help! Once that's in, we could use it here (this actually motivated me to finally tackle |
Description
Closes #3962
Text for release notes
Implements elementary matrix operation for MatrixObjects