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Add single-term multiplication for AbstractQ on v1.10 and above #52342

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merged 2 commits into from
Dec 5, 2023

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@jishnub jishnub commented Nov 29, 2023

The following works on Julia v1.9 but not on 1.10 and above, as Q is not an AbstractMatrix anymore, and doesn't have access to the fallback method:

julia> Q = qr(rand(4,4)).Q;

julia> *(Q)
4×4 LinearAlgebra.QRCompactWYQ{Float64, Matrix{Float64}, Matrix{Float64}}:
 -0.80458    -0.0760911   0.57709   -0.117597
 -0.0134158  -0.952934   -0.192074  -0.23419
 -0.492601    0.251727   -0.733911  -0.394147
 -0.331385   -0.150867   -0.302406   0.880894

This PR adds a trivial method to reinstate this behavior. A similar method exists for Givens, so something like this may be conceptualized for linear operators. Moreover, this may be pragmatic to avoid breakages. Currently, the tests for LazyArrays are broken on v1.10 as this method is missing.

@jishnub jishnub added linear algebra Linear algebra backport 1.10 Change should be backported to the 1.10 release labels Nov 29, 2023
@jishnub jishnub changed the title Single-term multiplication for AbstractQ Add single-term multiplication for AbstractQ on v1.10 and above Nov 29, 2023
@dkarrasch
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It seems that the array analogue has an eltype restriction <:Number, though I'm not sure why that is. But if we only want to restore previous behaviour, perhaps we should add it?

@dkarrasch dkarrasch merged commit 150c1ad into master Dec 5, 2023
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@dkarrasch dkarrasch deleted the jishnub/AbstractQmul branch December 5, 2023 10:05
KristofferC pushed a commit that referenced this pull request Dec 12, 2023
@KristofferC KristofferC mentioned this pull request Dec 12, 2023
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KristofferC added a commit that referenced this pull request Dec 17, 2023
Backported PRs:
- [x] #51234 <!-- Fix getfield codegen for tuple inputs and unknown
symbol fields. -->
- [x] #52170 <!-- fix invalidations related to `ismutable` -->
- [x] #52342 <!-- Add single-term multiplication for `AbstractQ` on
v1.10 and above -->
- [x] #52333 <!-- bugfix for dot of Hermitian{noncommutative} -->
- [x] #52407 <!-- channels: fix memory ordering violation in iterate -->
- [x] #52405 <!-- Bump LLVM to 15.0.7+10 to fix GC issue -->
- [x] #52441 <!-- Remove `Pkg` dependency from `SuiteSparse_jll` -->
- [x] #52367 <!-- docs: add notes about scratchspaces in depot -->
- [x] #52456 <!-- Make `jl_write_coverage_data` dllexported again -->
- [x] #52294 <!-- GC scheduler refinements -->
- [x] #52359 <!-- make custom log macros work -->
- [x] #52548
@KristofferC KristofferC removed the backport 1.10 Change should be backported to the 1.10 release label Dec 17, 2023
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3 participants