proof of concept for mul_tr #1386
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Fixed a (presumed) typo in documentation in matrix_view.rs. Previously it says fixed_view and fixed_slice returns a matrix with `(R::dim(), CView::dim())` consecutive components. I just changed R to RView, because presumably this is a typo.
Fixed a (presumed) typo in documentation in matrix_view.rs. Previously it says fixed_view and fixed_slice returns a matrix with `(RView, CView)` consecutive components. As per-input, and after re-reading the documentation and source code. Seems like RView and CView should be used instead of RView::dim() and CViem::dim().
Fixed spacing in documentation.
added mut_tr and the corresponding hidden yy_mul_to_uninit function.
added a test for mul_tr to verify that we get m.mul_tr(v) is m*v.transpose(). also changed the name of the previous test for tr_mul to clarify which side of the multiplication is being transposed.
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I saw issue #1254. Attempted to implement it following the implementation for tr_mul. I'm not quire sure why the original hidden function was called xx_mul_to_unit (specifically the xx part), but I made a corresponding function yy_mul_to_uninit.
Opening this pull request mainly to gather feedback, and if all is good I should be able to make other variations of the functions in ops.rs such as mul_ad, mul_tr_to, etc.