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Add getindex method to LU{Tridiagonal} for extracting factors (and full) #12137

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merged 1 commit into from
Jul 14, 2015
Merged

Add getindex method to LU{Tridiagonal} for extracting factors (and full) #12137

merged 1 commit into from
Jul 14, 2015

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andreasnoack
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This one has been missing for a while. Fixes JuliaLang/LinearAlgebra.jl#215, but returns a Matrix because the factors have to be stored as Matrixes. I don't think it is worth the trouble to make full return a Tridiagonal. I've added a specialized full method that returns the original Tridiagonal matrix.

@kshyatt kshyatt added the linear algebra Linear algebra label Jul 13, 2015
@andreasnoack
Add getindex method to LU{Tridiagonal} for extracting factors and full
857b367 
method to reconstruct the Tridiagonal matrix.
@andreasnoack andreasnoack changed the title Add getindex method to LU{Triangular} for extracting factors Add getindex method to LU{Tridiagonal} for extracting factors Jul 14, 2015
@andreasnoack andreasnoack changed the title Add getindex method to LU{Tridiagonal} for extracting factors Add getindex method to LU{Tridiagonal} for extracting factors (and full) Jul 14, 2015
andreasnoack added a commit that referenced this pull request Jul 14, 2015
@andreasnoack
Merge pull request #12137 from JuliaLang/anj/lu
0c2d664 
Add getindex method to LU{Tridiagonal} for extracting factors (and full)
@andreasnoack andreasnoack merged commit 0c2d664 into master Jul 14, 2015
@andreasnoack andreasnoack deleted the anj/lu branch July 14, 2015 14:50
@tkelman
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tkelman commented Jul 14, 2015

full returning a Tridiagonal is a little strange

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For factorizations, I think of full as the way of getting the original matrix back. We could consider other names for that.

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tkelman commented Jul 14, 2015

convert ?

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No because then you'd have to specify a type.

Den tirsdag den 14. juli 2015 skrev Tony Kelman [email protected]:

convert ?

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#12137 (comment).

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tkelman commented Jul 14, 2015

That seems like a good thing - the issue here is you've overloaded full with different ambiguous meanings. I think of full as always returning a dense array. This "inverse of factorize" meaning is really a totally separate thing.

@tkelman tkelman mentioned this pull request Jul 14, 2015
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tkelman commented Jul 14, 2015

opened JuliaLang/LinearAlgebra.jl#229

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full broken for LU{Tridiagonal} via missing getindex(::LU{Tridiagonal}, ::Symbol)
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@andreasnoack @tkelman @kshyatt