Deprecate scale #15258
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Deprecate scale #15258
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| OPENBLAS_BRANCH=v0.2.15 | |||
| OPENBLAS_SHA1=53e849f4fcae4363a64576de00e982722c7304f9 | |||
| OPENBLAS_BRANCH=develop | |||
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don't hide this in an unrelated pr
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| If ``A`` is a matrix and ``b`` is a vector, then ``scale(A,b)`` scales each column ``i`` of ``A`` by ``b[i]`` (similar to ``A*diagm(b)``\ ), while ``scale(b,A)`` scales each row ``i`` of ``A`` by ``b[i]`` (similar to ``diagm(b)*A``\ ), returning a new array. | ||
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| Note: for large ``A``\ , ``scale`` can be much faster than ``A .* b`` or ``b .* A``\ , due to the use of BLAS. |
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so is this not true any more?
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The deprecation suggestion is to use Diagonal(b)*A which calls BLAS. Actually, the difference is not really because of BLAS, but broadcasting overhead. With a nested loop, the code vectorizes and is as fast as BLAS on my machine.
We could move the "Note" to an entry for *(Diagonal,Matrix) or broadcast, but I'm not sure it will be easy to find in any of those places.
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KristofferC
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Feb 28, 2016
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In favor of
Diagonal(x)*Aorα*A.Fixes JuliaLang/LinearAlgebra.jl#248.
Update: Note that the potential small slowdown of
Diagonal(x)*Ainstead ofscale(x,A)should be eliminated thanks to #15259.