Inplace transpose for unit Triangular may skip diagonal #53101
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jishnub
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domain:linear algebra
dkarrasch
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Jan 31, 2024
KristofferC
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Feb 6, 2024
Since the diagonal elements of a `UnitUpperTriangular` are given by
`onelement`, these should be unchanged under `transpose/adjoint`, and we
don't need to access these elements in the parent array when performing
in-place operations.
Fixes
```julia
julia> using LinearAlgebra
julia> M = Matrix{BigFloat}(undef, 2, 2);
julia> M[1,2] = 3;
julia> U = UnitUpperTriangular(M)
2×2 UnitUpperTriangular{BigFloat, Matrix{BigFloat}}:
1.0 3.0
⋅ 1.0
julia> transpose!(U)
ERROR: UndefRefError: access to undefined reference
Stacktrace:
[1] getindex
@ ./essentials.jl:882 [inlined]
[2] getindex
@ ./array.jl:915 [inlined]
[3] copytri!
@ ~/packages/julias/julia-latest/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:414 [inlined]
[4] transpose!(A::UnitUpperTriangular{BigFloat, Matrix{BigFloat}})
@ LinearAlgebra ~/packages/julias/julia-latest/share/julia/stdlib/v1.11/LinearAlgebra/src/triangular.jl:470
[5] top-level scope
@ REPL[5]:1
```
After this PR:
```julia
julia> transpose!(U)
2×2 UnitLowerTriangular{BigFloat, Matrix{BigFloat}}:
1.0 ⋅
3.0 1.0
```
(cherry picked from commit cc74d24)
KristofferC
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the
backport 1.10
KristofferC
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Feb 6, 2024
A few stragglers. Backported PRs: - [x] #53091 <!-- Ensure elision of `require_one_based_indexing` with high-dim array views --> - [x] #53117 <!-- Try to fix incorrect documentation of `nthreads` --> - [x] #52855 <!-- Fix variable name in scaling an `AbstractTriangular` with zero alpha --> - [x] #52952 <!-- [REPLCompletions] enable completions for `using Module.Inner|` --> - [x] #53101 <!-- Inplace transpose for unit Triangular may skip diagonal --> Need manual backport: - [ ] #52505 <!-- fix alignment of emit_unbox_store copy --> Non-merged PRs with backport label: - [ ] #53125 <!-- coverage: count coverage where explicitly requested by inference only --> - [ ] #52694 <!-- Reinstate similar for AbstractQ for backward compatibility --> - [ ] #51479 <!-- prevent code loading from lookin in the versioned environment when building Julia -->
Drvi
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Jun 7, 2024
) Since the diagonal elements of a `UnitUpperTriangular` are given by `onelement`, these should be unchanged under `transpose/adjoint`, and we don't need to access these elements in the parent array when performing in-place operations. Fixes ```julia julia> using LinearAlgebra julia> M = Matrix{BigFloat}(undef, 2, 2); julia> M[1,2] = 3; julia> U = UnitUpperTriangular(M) 2×2 UnitUpperTriangular{BigFloat, Matrix{BigFloat}}: 1.0 3.0 ⋅ 1.0 julia> transpose!(U) ERROR: UndefRefError: access to undefined reference Stacktrace: [1] getindex @ ./essentials.jl:882 [inlined] [2] getindex @ ./array.jl:915 [inlined] [3] copytri! @ ~/packages/julias/julia-latest/share/julia/stdlib/v1.11/LinearAlgebra/src/matmul.jl:414 [inlined] [4] transpose!(A::UnitUpperTriangular{BigFloat, Matrix{BigFloat}}) @ LinearAlgebra ~/packages/julias/julia-latest/share/julia/stdlib/v1.11/LinearAlgebra/src/triangular.jl:470 [5] top-level scope @ REPL[5]:1 ``` After this PR: ```julia julia> transpose!(U) 2×2 UnitLowerTriangular{BigFloat, Matrix{BigFloat}}: 1.0 ⋅ 3.0 1.0 ``` (cherry picked from commit cc74d24)
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Since the diagonal elements of a
UnitUpperTriangularare given byonelement, these should be unchanged undertranspose/adjoint, and we don't need to access these elements in the parent array when performing in-place operations.Fixes
After this PR: