Error using gpuArray/subsasgn

Hi everyone

I am working on GPU. I have a problem with it. I try to assign to a gpu Array. but i get this error.

it is working on CPU, however GPU is not.

"Error using gpuArray/subsasgn

When assigning into a GPUArray, the subscripts must contain unique values. Subscript 1 contained repeated values."

can you tell me how to solve this error?

Thanks

Answer 1

[Edric Ellis]

You can avoid this error by ensuring that your subscript contains only unique values, using the MATLAB function unique. For example:

gvec = gpuArray(1:100);
% Indexes to assign - contains repeated indices
idxs = [1 1 2 3];
% Values to assign
vals = rand(1, 4);
% This would get an error - the assignment happens in parallel on the GPU, 
% so which value should gvec(1) get - vals(1) or vals(2)?
%gvec(idxs) = vals;

% Use UNIQUE on idxs
[uniqueIdxs, locOfUniqueIdxs] = unique(idxs);
% Assign using only the unique indices, and the corresponding values
gvec(uniqueIdxs) = vals(locOfUniqueIdxs);

[Guangyi Zhang]

my problem is "Error, gpuArray/subsasgn

Sparse gpuArrays are not supported for this function."

how to solve that?

[Edric Ellis]

You cannot modify sparse gpuArray data once you have put it on the GPU - you should set up the data as you want it to be, then send it to the GPU.