MATLAB: Passing GPUArray to feval

Question

I have the following kernel

_global_ void func( float * arr, int N ) {

     int rtid = blockDim.x * blockIdx.x + threadIdx.x;
     if( rtid < N )
    {
      float* row = (float*)((char*)arr + rtid*N*sizeof(float) ); 
      for (int c = 1; c < N; ++c) 
      { 
        //Manipulation
      } 
    } 
}

When I call the kernel from MATLAB using

gtm= parallel.gpu.GPUArray(ones(a,b,'double')); OR gtm= parallel.gpu.GPUArray(ones(1,b,'double'));

gtm=k.feval(gtm,b);

it is giving the following error:

 Error using ==> feval
parallel.gpu.GPUArray must match the exact input type as specified on the kernel
prototype.

Error in ==> sameInit at 65 gtm=k.feval(gtm,b);

Can someone please tell me where am I going wrong.

Thanking You, Viharri P L V.

Answer 1

You are creating gtm as a double, and trying to pass it as the first input to a kernel that expects a float. Try using this instead:

 gtm = parallel.gpu.GPUArray.ones(a, b, 'single');