Why can't I use gpuArray in Simulink?

Hello!

I am trying to use gpuArrays in a MATLAB function block inside my Simulink Model. It is throwing the following error,

Undefined function or variable 'gpuArray'.

Function 'Signal Generation/IQ Signal Generation (Simulation)/GenerateTxSignals/Build Transmitter Signals/MATLAB Function' (#1183.3137.3156), line 86, column 26:
"gpuArray(SigSource)"

I was trying to convert an existing Array into a GPU Array,

SigSource = gpuArray(SigSource);

Is it not possible to use gpuArray inside a MATLAB function block?

Other Details,

• MATLAB Version: 2017a
• Driver Version: '23.21.13.9133 (391.33)'
• Parallel Computing Toolbox Version 6.10 (R2017a)

Answer 1

[Bhavanithya Thiraviaraja]

Declaring coder.extrinsic('gpuArray') before calling the function solves the issue. However, it should be noted that there is no code Generation for this function as it is declared extrinsic.

[Joss Knight]

This certainly should be possible and sounds like a bug. Can you provide an example model that reproduces this issue?

[Joss Knight]

Oh, I think I understand - this is an Embedded MATLAB function block, presumably. Since gpuArray is not supported for code generation (unless you have GPU Coder), this error is expected. gpuArray will work inside an ordinary MATLAB function block.