Functions arrayfun and roots with GPU computing

Hi guys, I would like to compute the roots of N 8th order polynomials using the matlab function roots. I also would like to accomplish this task by taking advantage of GPU computing.

I've tried doing so with the following code:

rts_GPU=arrayfun(@(c4,c0) roots([C8,0,0,0,c4,0,0,0,c0]),aC4,aC0);

Where

• C8 is constant
• aC4 and aC0 are column vectors (created on the GPU) containing the coefficients associated to x^4 and x^0

But I get the following error:

Error using gpuArray/arrayfun
Function passed as first input argument contains unsupported or unknown function 'roots'.

But it is not true that the function "roots" it is not supported. Anyway, the code runs fine if aC4 and aC0 are not created on the GPU and 'UniformOutput' is set to false.

Maybe arrayfun is not even the right "tool" to do this, does anyone know how to solve this problem? Thanks in advance

Answer 1

[Edric Ellis]

The list of functions supported for use with gpuArray arrayfun is here. Unfortunately, roots is not supported for gpuArray arrayfun.

[Dave]

Ok I was wrong, I was looking at the list of functions that supported gpuArray input arguments. Thank you.