Using coder.extrinsic with "spectrum.periodogram" in simulink?

I am trying to incorporate a matlab function into a simulink model; I've pasted the function into a "Matlab function" simulink block, but it won't run due to various functions not being supported for standalone code generation.

Here's the start of the function:

function [found, m]  = FFTscan( signal, Fs )
Hs=spectrum.periodogram;
PSD=psd(Hs,signal,'Fs',Fs);         %creates FFT of signal

psd(Hs,signal,'Fs',Fs)
released=PSD.Data;                  %strips values from FFT

PSDn=released./max(released);       %normalizes values from FFT
...

Returns the following error:

The function 'spectrum' is not supported for standalone code generation. See the documentation for coder.extrinsic to learn how you can use this function in simulation.

Function 'Subsystem1/Algorithm/MATLAB Function' (#22.166.174), line 7, column 4:
"spectrum"
Launch diagnostic report.

I've tried appending the above code with:

coder.extrinsic('spectrum', 'psd');

But the block still throws the same error. Does anyone know how I can go about using these functions in simulink?

Thanks,

-Will

Answer 1

[Arnab De]

From your code, it appears that spectrum is not a function, but a class. coder.extrinsic declaration does not work with classes. You need to wrap uses of that class in a function and declare that function extrinsic.