Sparse for gpuArray problem

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shahrizan jamaludin
评论： Joss Knight 2016-3-21
Hello, i got problem with the code below:
pix=pix1; %pix1 is gpuArray with size 5194x2
P1=pix(:,2); %gpuArray with size 5194x1
P2=pix(:,1); %gpuArray with size 5194x1
spr=sparse(P1,P2,1,size(A,1),size(A,2));
%Error using gpuArray/sparse. Too many input arguments
but if i put "gather", it shows no error.
pix=pix1; %pix1 is gpuArray with size 5194x2
pix=gather(pix); % double with 5194x2
P1=pix(:,2); %double with size 5194x1
P2=pix(:,1); %double with size 5194x1
spr=sparse(P1,P2,1,size(A,1),size(A,2));
What went wrong? Any limitation for sparse in gpuArray? My GPU is 4GB

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采纳的回答

Joss Knight
Joss Knight 2016-3-8
Yes, in R2015b the five-argument form of sparse is not supported for gpuArray. See help gpuArray/sparse.
Now that it's out you can upgrade to R2016a, which does support the five-argument form of gpuArray/sparse.
  2 个评论
Joss Knight
Joss Knight 2016-3-21
By the way, in R2015b you can use accumarray, which has very much the same syntax as the 5-argument form of sparse. All you do is combine i and j into one matrix, also combine m and n into one size input, and specify the 6th argument as true (output sparse matrix), namely:
S = accumarray([i j], s, [m n], [], [], true);
is equivalent to
S = sparse(i, j, s, m, n);

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