Add istriu, istril, issymmetric, and ishermitian methods for UniformS…

…caling (#17950)
JuliaLang · Aug 18, 2016 · 57df5f1 · 57df5f1
1 parent 04047f6
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diff --git a/base/linalg/uniformscaling.jl b/base/linalg/uniformscaling.jl
@@ -29,6 +29,11 @@ one{T}(J::UniformScaling{T}) = one(UniformScaling{T})
 zero{T}(::Type{UniformScaling{T}}) = UniformScaling(zero(T))
 zero{T}(J::UniformScaling{T}) = zero(UniformScaling{T})
 
+istriu(::UniformScaling) = true
+istril(::UniformScaling) = true
+issymmetric(::UniformScaling) = true
+ishermitian(J::UniformScaling) = isreal(J.λ)
+
 (+)(J1::UniformScaling, J2::UniformScaling) = UniformScaling(J1.λ+J2.λ)
 (+){T}(B::BitArray{2},J::UniformScaling{T}) = Array(B) + J
 (+)(J::UniformScaling, B::BitArray{2})      = J + Array(B)

diff --git a/test/linalg/uniformscaling.jl b/test/linalg/uniformscaling.jl
@@ -16,6 +16,12 @@ srand(123)
 @test one(UniformScaling(rand(Complex128))) == one(UniformScaling{Complex128})
 @test eltype(one(UniformScaling(rand(Complex128)))) == Complex128
 @test -one(UniformScaling(2)) == UniformScaling(-1)
+@test istriu(I)
+@test istril(I)
+@test issymmetric(I)
+@test issymmetric(UniformScaling(complex(1.0,1.0)))
+@test ishermitian(I)
+@test !ishermitian(UniformScaling(complex(1.0,1.0)))
 
 α = randn()
 @test α .* UniformScaling(1.0) == UniformScaling(1.0) .* α