Error using gpuArray/arrayfun ('MCOS', 'CLASSDEF')

Hello,

i am currently trying to do some calculations of my code on gpu. therefore, i call the following lines:

angles=gpuArray(angles);

[obj.Points(1,:),obj.Points(2,:)]=arrayfun(@(x) laser.calccolpnt(x,cell2mat(Obstacles.Obstaclemap),obj.position,obj.direction,obj.range),angles);

without the first line, this works perfectly fine, anyway, when i add the gpuArray command before, this gives me the following error:

Error using gpuArray/arrayfun
Function passed as first input
argument contains unsupported
'MCOS' language feature 'CLASSDEF'.

i even get this, when the called function looks like this:

function [px,py]=calccolpnt(angle,Obstacles,position,direction,range)

     px=angle;

     py=angle;

end

does anyone know a solution for this problem?

thanks for help.

Answer 1

[Walter Roberson]

MCOS appears to be the name of the newer object-oriented system that uses classdef to define objects.

Restrictions on the called functions for gpuarray and arrayfun are described at http://www.mathworks.com/help/distcomp/run-element-wise-matlab-code-on-a-gpu.html#bsnx7h8-1

I gather that the problem here is that the function you are passing is defined in a classdef and that just is not permitted.

You might be able to call a function outside of a classdef that referred to a user-defined object, but I do not know if it is possible or not.

[Bart van Essen]

Thanks for your help, i now passed the arguments to a function outside of any class. Anyway, I just found out, that i cannot use a functional workspace, making gpuArray pretty useless for me, because the calculations i make are pretty complex and need around 30 lines of code. is there some trick to run complex code on a gpuArray?

[Edric Ellis]

What do you mean by "functional workspace"? The gpuArray version of arrayfun can handle nested and anonymous functions which refer to variables defined in the outer context.