SparseMatrixCSR extension

[termi-official]

Towards #848 and #628 . This should show how we could assemble into custom sparse matrix formats.

TODO

• Fix inhomogeneous boundary conditions
• Add devdocs
• Add test

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.70%. Comparing base (b56e2c9) to head (0f42594).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #864      +/-   ##
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+ Coverage   93.57%   93.70%   +0.12%     
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  Files          39       40       +1     
  Lines        6074     6160      +86     
==========================================
+ Hits         5684     5772      +88     
+ Misses        390      388       -2     

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[KnutAM]

Just took a look as I was curious, nice work on factoring out some parts - this will make it easier to extend!

[lijas]

Nice!
It could be nice to use the SparseMatrixCSR in one of the tutorials also (for testing and showing user that it is possible)

[fredrikekre]

I suppose in all(?) cases the solver will dictate what matrix you need to, or can, use. Is there any solver that can handle SparseMatrixCSR but not SparseMatrixCSC?

[termi-official]

Nice! It could be nice to use the SparseMatrixCSR in one of the tutorials also (for testing and showing user that it is possible)

I decided to not use it in one of the tutorials for now, because I didn't wanted to clutter any of these. It should also be clear how to use it from the docstring of start_assemble ? Which test is missing in https://github.com/Ferrite-FEM/Ferrite.jl/pull/864/files#diff-7fa26eddc1fe6a8a5341e0fcdffb1d8c256e6a566819cfcf70b625ef80ab6abd ? (At least codecov says I have coverage).

[termi-official]

I suppose in all(?) cases the solver will dictate what matrix you need to, or can, use. Is there any solver that can handle SparseMatrixCSR but not SparseMatrixCSC?

If you talk about matrix formats, then e.g. Ginkgo and Hypre just have CSR formats (and no CSC).

[fredrikekre]

Yea but then you wouldn't go through SparseMatrixCSR.jl but directly to a HYPRE matrix or Ginkgo matrix?

[termi-official]

Yea but then you wouldn't go through SparseMatrixCSR.jl but directly to a HYPRE matrix or Ginkgo matrix?

Yes

[termi-official]

What is the correct way to communicate this? Adding @docs breaks the CI, because the doc string is already listed in references.