Fix for DiagonalMatrix * OtherMatrix

Summary

This MR provides an overload for the matrix-matrix product involving a DiagonalMatrix as first factor. This was not working properly before, if the second factor is a transposed view of a matrix, see #400 (closed).

In addition to the operator* overload for DiagonalMatrix and some other dense matrix, this MR implements the operator[] overload for the TransposedMatrixWrapper in order to implement the matrix-matrix product. If someone has a better idea, please comment.

• Needs documentation of the new methods.
• Needs some additional tests of the methods.
• Needs !1496 (merged)

Closes #400 (closed)

added bugfix label

requested review from @carsten.graeser

assigned to @simon.praetorius

mentioned in merge request !1478 (merged)

changed the description

changed the description

marked this merge request as draft

marked the checklist item Needs !1496 (merged) as completed

added 92 commits

• edd8fa1a...95b4edaa - 90 commits from branch master
• b828fc8d - Fix for DiagonalMatrix * OtherMatrix
• c1b7862a - Check whether OtherMatrix is a dense matrix

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resolved all threads

added 1 commit

• 6e405afa - Undo changes to transpose

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added 1 commit

• 7d2f974a - Add some documentation

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marked the checklist item Needs documentation of the new methods. as completed

added 2 commits

• 24b83bb9 - Add matrix-matrix multiplication with DiagonalMatrix<1>
• 1ccfedb6 - Add a test of the matrix-matrix multiplication with DiagonalMatrix

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marked the checklist item Needs some additional tests of the methods. as completed

marked this merge request as ready

Looks good.

added 1 commit

• c702e475 - Add some includes of data structures used in the matrix product

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resolved all threads

approved this merge request

merged

mentioned in commit 3dfe5805