How do I use MATLAB Coder to generate C++ code for an IIR filter that was generated by designfilt?

I have the file gpsFilterTest.m with:

Fpass = .5;

Fstop = 1;

Ap = .5;

Astop = 80;

FsampleRate = 10;

dellip = designfilt('lowpassiir','PassbandFrequency', Fpass,...

'StopbandFrequency', Fstop, 'PassbandRipple', Ap,...

'StopbandAttenuation',Astop,'SampleRate',FsampleRate, 'DesignMethod', 'ellip');

gpsData = 0:1:1000;

gpsIndex = gpsData;

gpsData = gpsData + transpose(randn(1001,1));

filteredGpsData = gpsFilter(gpsData);

plot(gpsIndex,filteredGpsData);

I have the file gpsFilter.m with:

function filteredGpsData = gpsFilter(gpsData)

%#codegen

filteredGpsData = filter(dellip,gpsData);

end

I get this error when I try to automatically define input types:

I hope the answer to this question will help others besides me.

Answer 1

[Raghava S N]

So, first of all, the dellip argument should be declared inside the gpsFilter function, because code generation does not support arrays of classes as function parameter. Once you declare dellip inside gpsFilter by sending Fpass,Fstop,Ap,Astop,FsampleRate as parameters to gpsFilter, MATLAB Coder gives the following error:

Do check out the following articles on how to solve this issue.

How to write C code generation for ' not available function for standalone generation' ? - MATLAB Answers - MATLAB Central (mathworks.com)

Resolve Error: Function Is Not Supported for Code Generation - MATLAB & Simulink (mathworks.com)