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[LinearAlgebra] Add isdiag/isposdef for Diagonal and UniformScaling #29638

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merged 10 commits into from Oct 16, 2018

correct isposdef(::UniformScaling)

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dkarrasch committed Oct 15, 2018
commit b53c3a5e6a93286d3ae3039780e617c24340cfc7
@@ -79,7 +79,7 @@ istriu(::UniformScaling) = true
istril(::UniformScaling) = true
issymmetric(::UniformScaling) = true
ishermitian(J::UniformScaling) = isreal(J.λ)
isposdef(J::UniformScaling) = J.λ > zero(J.λ)
isposdef(J::UniformScaling) = isposdef(J.λ)

(+)(J::UniformScaling, x::Number) = J.λ + x
(+)(x::Number, J::UniformScaling) = x + J.λ
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