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ldiv! for Diagonal and a sparse vector #613

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Apr 7, 2025
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ldiv! for Diagonal and a sparse vector #613

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2 changes: 1 addition & 1 deletion src/linalg.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -1312,7 +1312,7 @@ function rdiv!(A::AbstractSparseMatrixCSC{T}, D::Diagonal{T}) where T
A
end

function ldiv!(D::Diagonal{T}, A::AbstractSparseMatrixCSC{T}) where {T}
function ldiv!(D::Diagonal{T}, A::Union{AbstractSparseMatrixCSC{T}, AbstractSparseVector{T}}) where {T}
# require_one_based_indexing(A)
if size(A, 1) != length(D.diag)
throw(DimensionMismatch("diagonal matrix is $(length(D.diag)) by $(length(D.diag)) but right hand side has $(size(A, 1)) rows"))
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3 changes: 3 additions & 0 deletions test/linalg.jl
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Expand Up @@ -338,6 +338,9 @@ end
@test lmul!(transpose(copy(D)), copy(b)) ≈ transpose(MD)*bd
@test lmul!(adjoint(copy(D)), copy(b)) ≈ MD'*bd
end

v = sprand(eltype(D), size(D,1), 0.1)
@test ldiv!(D, copy(v)) == D \ Array(v)
end
end

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