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bugfix for ldiv!(D::Diagonal, B::StridedVecOrMat) and tests #32104

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Jun 18, 2019
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bugfix for ldiv!(D::Diagonal, B::StridedVecOrMat) and tests #32104

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2 changes: 1 addition & 1 deletion stdlib/LinearAlgebra/src/diagonal.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -481,7 +481,7 @@ function ldiv!(D::Diagonal, B::StridedVecOrMat)
if di == 0
throw(SingularException(i))
end
B[i,j] /= di
B[i,j] = di \ B[i,j]
end
end
return B
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9 changes: 9 additions & 0 deletions stdlib/LinearAlgebra/test/diagonal.jl
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Expand Up @@ -441,6 +441,15 @@ end
@test det(D) == 4
end

@testset "linear solve for block diagonal matrices" begin
D = Diagonal([rand(2,2) for _ in 1:5])
b = [rand(2,2) for _ in 1:5]
B = [rand(2,2) for _ in 1:5, _ in 1:5]
@test ldiv!(D, copy(b)) ≈ Diagonal(inv.(D.diag)) * b
@test ldiv!(D, copy(B)) ≈ Diagonal(inv.(D.diag)) * B
@test rdiv!(copy(B), D) ≈ B * Diagonal(inv.(D.diag))
end

@testset "multiplication with Symmetric/Hermitian" begin
for T in (Float64, ComplexF64)
D = Diagonal(randn(T, n))
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