In https://github.com/JuliaLang/julia/pull/38315#issuecomment-722623188 I suggested iterating over nonzero values as a possible efficient generic constructor for SparseMatrix I then proceed to realize that there isn’t such a function that works generically. SparseArrays has findnz, but it only seems to be defined for SparseMatrixCSC and SparseVector. Why is this? This feels like it would be a really useful method to have for generic structured arrays.
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