Fix copy for partly initialized unit triangular #1350
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jishnub
added
backport 1.12
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## master #1350 +/- ##
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+ Coverage 93.12% 93.75% +0.62%
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dkarrasch
approved these changes
May 13, 2025
dkarrasch
approved these changes
May 13, 2025
jishnub
added a commit
that referenced
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May 14, 2025
Currently, we forward copy for unit triangular matrices to the parents.
This also copies the diagonal, which may not be initialized in the
parent. This PR fixes this.
After this, the following works again
```julia
julia> M = Matrix{BigFloat}(undef,2,2);
julia> M[2,1] = 3;
julia> M'
2×2 adjoint(::Matrix{BigFloat}) with eltype BigFloat:
#undef 3.0
#undef #undef
julia> U = UnitUpperTriangular(M')
2×2 UnitUpperTriangular{BigFloat, Adjoint{BigFloat, Matrix{BigFloat}}}:
1.0 3.0
⋅ 1.0
julia> copyto!(similar(M), U)
2×2 Matrix{BigFloat}:
1.0 3.0
0.0 1.0
```
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Currently, we forward copy for unit triangular matrices to the parents. This also copies the diagonal, which may not be initialized in the parent. This PR fixes this.
After this, the following works again