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Slightly loosen a test so that linalg tests pass when using MKL #42315

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Sep 20, 2021
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Slightly loosen a test so that linalg tests pass when using MKL #42315

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2 changes: 1 addition & 1 deletion stdlib/LinearAlgebra/test/matmul.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -152,7 +152,7 @@ end
for vf in (copy(vvf), view(vvf, 1:3)), C in (copy(CC), view(CC, 1:3, 1:3))
@test mul!(C, vf, transpose(vf)) == vf*vf'
C .= C0 = rand(eltype(C), size(C))
@test mul!(C, vf, transpose(vf), 2, 3) == 2vf*vf' .+ 3C0
@test mul!(C, vf, transpose(vf), 2, 3) ≈ 2vf*vf' .+ 3C0
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I'm wondering if this was exact equality for a reason, cc @tkf

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The difference is 1e-15 in one of the elements. 3 of these tests fail with MKL.

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I think I simply copied the pattern from mul!(C, vf, transpose(vf)) == vf*vf' just above.

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@andreasnoack andreasnoack Sep 20, 2021 •
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In the test above, I think the idea is that it should be the exact same code path for the right and left hand side and therefore exact equality. It wasn't obvious to me that this test should take the same path for right and left hand side but wondered if that was your intention. If not then this PR should be fine.

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Yeah, sorry, I was sloppy. This change LGTM too.

end
end

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