codegen incorrect argument data type in Matlab example

Hello,

I am trying to use the parfor command and am trying out two of the examples given on the parfor page, but neither will compile due to an issue with codegen. I have the following saved in a file as test_parfor.m

function a = test_parfor %#codegen
  a = ones(10,256);  
  r = rand(10,256);
  parfor i = 1:10
    a(i,:) = real(fft(r(i)));
  end
end

Then, I run

codegen test_parfor

but I receive the error

"Check for incorrect argument data type or missing argument in call to function 'codegen'."

I also tried manually specifying the MEX configuration:

codegen -config:mex test_parfor

to no avail.

I cannot run the second example, either, using the function specify_num_threads. My first thought is that I might be calling the function when it's not in my current path, but that's not the case. I also looked at some common issues with codegen and it looks like there may be compiler compatibility issues with Unix (I'm using MacOS), but I also have XCode 11 installed, so that shouldn't be the problem either. I'd appreciate any help with this.

Answer 1

[Raymond Norris]

There are several codegen functions/methods

• MATLAB Coder
• Control Toolbox

Is it possible you have Control Toolbox installed, but not MATLAB Coder (or perhaps you don't have MATLAB Coder licensed)? To check, run

license inuse
license test matlab_coder

[Greg Kirwin]

Running the second command gives a 1, so it seems like Coder is licensed, but it looks like it's not actually installed, so I am doing so now. So, the issue is that both tools are needed to be able to use codegen?

[Raymond Norris]

I don't support MATLAB Coder, but if you want codegen from MATLAB Coder, then yes, you'd need MATLAB Coder installed. Not aware of what codegen in Control Toolbox does -- just aware that it exists. It's possible this is creating the error.