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stdlib/SparseArrays: add rmul! and lmul! of sparse matrix with Diagonal #29296

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merged 5 commits into from
Sep 29, 2018
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stdlib/SparseArrays: add rmul! and lmul! of sparse matrix with Diagonal #29296

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0537f6b
Add rmul! and lmul! of sparse matrix with Diagonal
dkarrasch Sep 21, 2018
b93376c
Merge pull request #1 from dkarrasch/dk_rmul_lmul_sp_diag
dkarrasch Sep 21, 2018
43af178
Some optimization
dkarrasch Sep 21, 2018
2efc646
merge loops again for consistency
dkarrasch Sep 21, 2018
2edf05f
remove unused parametrized type
dkarrasch Sep 28, 2018
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22 changes: 22 additions & 0 deletions stdlib/SparseArrays/src/linalg.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1017,11 +1017,33 @@ function rmul!(A::SparseMatrixCSC, b::Number)
rmul!(A.nzval, b)
return A
end

function lmul!(b::Number, A::SparseMatrixCSC)
lmul!(b, A.nzval)
return A
end

function rmul!(A::SparseMatrixCSC, D::Diagonal{T}) where T
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T is never used in the function body so I think you can make this signature

function rmul!(A::SparseMatrixCSC, D::Diagonal). (same for lmul)

m, n = size(A)
(n == size(D, 1)) || throw(DimensionMismatch())
Anzval = A.nzval
@inbounds for col = 1:n, p = A.colptr[col]:(A.colptr[col + 1] - 1)
Anzval[p] *= D.diag[col]
end
return A
end

function lmul!(D::Diagonal{T}, A::SparseMatrixCSC) where T
m, n = size(A)
(m == size(D, 2)) || throw(DimensionMismatch())
Anzval = A.nzval
Arowval = A.rowval
@inbounds for col = 1:n, p = A.colptr[col]:(A.colptr[col + 1] - 1)
Anzval[p] *= D.diag[Arowval[p]]
end
return A
end

function \(A::SparseMatrixCSC, B::AbstractVecOrMat)
@assert !has_offset_axes(A, B)
m, n = size(A)
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