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Make dot handle missings #40769

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Make dot handle missings #40769

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8794613
Make `dot` handle `missing`s
dkarrasch May 10, 2021
51d6c15
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dkarrasch May 10, 2021
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3 changes: 3 additions & 0 deletions stdlib/LinearAlgebra/src/generic.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -903,6 +903,9 @@ function dot(x, y) # arbitrary iterables
end

dot(x::Number, y::Number) = conj(x) * y
dot(::Number, ::Missing) = missing
dot(::Missing, ::Number) = missing
dot(::Missing, ::Missing) = missing

function dot(x::AbstractArray, y::AbstractArray)
lx = length(x)
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8 changes: 8 additions & 0 deletions stdlib/LinearAlgebra/test/generic.jl
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Expand Up @@ -512,6 +512,14 @@ end
end
end

@testset "dot with missing" begin
x = [5, 6, missing]
y = [missing, 5, 6]
@test ismissing(dot(x, x))
@test ismissing(dot(x, y))
@test ismissing(dot(y, x))
end

@testset "condskeel #34512" begin
A = rand(3, 3)
@test condskeel(A) ≈ condskeel(A, [8,8,8])
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