Linear algebra test coverage for SubArray

[andreasnoack]

Below is the list of linear algebra test files that we'll need to extend with SubArray tests. Please update the list if SubArrays are already covered (systematically) for the file

• arnoldi.jl
• bidiag.jl
• bunchkaufman.jl
• cholesky.jl
• dense.jl
• diagonal.jl
• eigen.jl
• generic.jl (see Adding SubArray tests to generic.jl, includes fix for linreg bug found julia#15145)
• givens.jl
• lapack.jl
• lu.jl
• lq.jl
• matmul.jl
• pinv.jl
• qr.jl
• schur.jl
• special.jl
• svd.jl
• symmetric.jl
• triangular.jl
• tridiag.jl
• uniformscaling.jl (see Test UniformScaling methods with SubArrays. julia#14731)

[andreasnoack]

@kshyatt Are tridiagonal, bidiagonal and diagonal now covered? If so, please update the list.

[pkofod]

just to be 100% sure, this is simply to make sure that the functions return the same thing / work even if it's a SubArray and not an array?

[kshyatt]

Yeah, the idea is to make sure Diagonal {*, +, -, /} SubArray still works.

[pkofod]

svd.jl should be covered by JuliaLang/julia#15314 .

[andreasnoack]

Great. Top post is now updated.

[pkofod]

I'll probably grab some more the coming days, and pile them in a PR with separate commits. I assume none are taken?

[tkelman]

Nope, go nuts. Keep em coming @pkofod, big fan of your recent contributions.

[pkofod]

Most of arnoldi.jl is sparse matrices. Should these just be ignored here? Methods don't seem to be defined for sparse matrices (#15355 ) possibly because it will rarely be a good idea to operate on views of sparse matrices.