This surprised me: julia> typeof(copy(rand(4,4)')) Matrix{Float64} (alias for Array{Float64, 2}) julia> typeof(deepcopy(rand(4,4)')) LinearAlgebra.Adjoint{Float64, Matrix{Float64}} I have an algorithm which looks prettier when written assuming row-major order. To ensure the code looks pretty and …

The interface of copy is mostly a convention, but generally if the argument is a wrapper that provides a “view” (eg Adjoint, PermutedDimsArray, SubArray), would you expect that it copies the parent and makes a similar view? This may be a reasonable use case in some contexts, but that’s not how it w…

Why is `copy(adjoint)` not an adjoint object?

Internals & Design

Krastanov February 16, 2021, 4:23am 2

More generally, why is copy not preserving the type of the object it is copying?

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Why is `copy(adjoint)` not an adjoint object?

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