Fix constructors of Symmetric and Hermitian #21622
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fredrikekre
commented
Apr 28, 2017
| if A.uplo == char_uplo(uplo) | ||
| return A | ||
| else | ||
| throw(ArgumentError("Cannot construct Symmetric; uplo doesn't match")) |
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Suggestions for better messages here? :)
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why not just ignore the uplo argument? Presumably, if you're building a symmetric matrix from an already symmetric matrix, taking the lower or upper triangle should not matter since they are the same.
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I think it is unlikely that people will hit this exception on purpose, i.e. where they want to flip the storage. We can revisit if it is really an issue.
andreasnoack
approved these changes
Apr 29, 2017
tkelman
reviewed
Apr 29, 2017
| @@ -41,6 +41,15 @@ julia> Slower = Symmetric(A, :L) | |||
| Note that `Supper` will not be equal to `Slower` unless `A` is itself symmetric (e.g. if `A == A.'`). | |||
| """ | |||
| Symmetric(A::AbstractMatrix, uplo::Symbol=:U) = (checksquare(A); Symmetric{eltype(A),typeof(A)}(A, char_uplo(uplo))) | |||
| Symmetric(A::Symmetric) = A | |||
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tiny bit inconsistent that here the default uplo matches that of the input, whereas on all other types it defaults to upper
This was referenced Jun 7, 2017
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Fix JuliaLang/LinearAlgebra.jl#423