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general concatenation (cat) of sparse arrays yields dense #17680

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Sacha0 opened this issue Jul 28, 2016 · 0 comments
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general concatenation (cat) of sparse arrays yields dense #17680

Sacha0 opened this issue Jul 28, 2016 · 0 comments
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sparse Sparse arrays types and dispatch Types, subtyping and method dispatch

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@Sacha0
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Sacha0 commented Jul 28, 2016 

julia> cat((1,2), spdiagm(1:4), spdiagm(1:4))
8×8 Array{Int64,2}:
 1  0  0  0  0  0  0  0
 0  2  0  0  0  0  0  0
 0  0  3  0  0  0  0  0
 0  0  0  4  0  0  0  0
 0  0  0  0  1  0  0  0
 0  0  0  0  0  2  0  0
 0  0  0  0  0  0  3  0
 0  0  0  0  0  0  0  4

Cross reference #15172 and #16722. Best!
@kshyatt kshyatt added sparse Sparse arrays types and dispatch Types, subtyping and method dispatch labels Jul 28, 2016
This was referenced Jul 28, 2016
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JeffBezanson added a commit that referenced this issue Jul 29, 2016
@JeffBezanson
Merge pull request #17690 from Sacha0/sparsegencat
ba46baf 
Fix #17680 (sparse general concatenation) and #17686 (concatenation of heterogeneous Matrix-Vector combinations)
KristofferC pushed a commit that referenced this issue Jul 30, 2016
@Sacha0 @KristofferC
Make general concatenations (cat) of combinations of sparse matrice…
51752d4 
…s with sparse matrices or dense matrices/vectors yield sparse arrays (fixes #17680).
@Sacha0 Sacha0 mentioned this issue Aug 7, 2016
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mfasi pushed a commit to mfasi/julia that referenced this issue Sep 5, 2016
@Sacha0 @mfasi
Make general concatenations (cat) of combinations of sparse matrice…
788e01e 
…s with sparse matrices or dense matrices/vectors yield sparse arrays (fixes JuliaLang#17680).
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