Undefined function or variable

Hello,

I'm trying to improve my code execution speed by using GPU, here is my code :

.
......

    size_mat=size(ind_mat,1);
    tryy=gpuArray(tryy);
    ind_mat=gpuArray(ind_mat);
    tryy=arrayfun(@aGpuFunction, tryy, ind_mat,size_mat);
    sinogram = tryy;
    sinogram = gather(sinogram);

.......

And the function:

.
function tryy = aGpuFunction(tryy,ind_mat,size_mat)
for k=1:size_mat    
if( ind_mat(k,2)~=1&&ind_mat(k,3)~=4008&&ind_mat(k,1)~=1&&ind_mat(k,1)~=4500)
tryy(ind_mat(k,1),ind_mat(k,2))=(tryy(ind_mat(k,1)-1,ind_mat(k,2))+tryy(ind_mat(k,1)+1,ind_mat(k,2))+tryy(ind_mat(k,1),ind_mat(k,2)-1))./3;
tryy(ind_mat(k,1),ind_mat(k,3))=(tryy(ind_mat(k,1)-1,ind_mat(k,3))+tryy(ind_mat(k,1)+1,ind_mat(k,3))+tryy(ind_mat(k,1),ind_mat(k,3)+1))./3;
end
end

When I execute my code, i got the following error :

Error using parallel.gpu.GPUArray/arrayfun
Undefined function or variable 'k'.

Error in antispeckle_filter (line 22)
tryy=arrayfun(@aGpuFunction, tryy, ind_mat,size_mat);

I'm stuck here... Does anyone got an idee ?

Thanks!

Selim

Answer 1

[Andy]

hello Selim,

sorry for the poor error message. it will be improved in a future release.

the main problem with the MATLAB code you are trying to evaluate via arrayfun is it does indexing. currently, indexing is not supported for functions being evaluated by arrayfun as discussed in the doc.

the following link is a good place to start exploring PCT's GPU offering, http://www.mathworks.com/help/toolbox/distcomp/bsic4n4-1.html

for more specific information about arrayfun on the GPU a good place to start is, http://www.mathworks.com/help/toolbox/distcomp/arrayfun.html

thanks,

Andy