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

Question

Robert 2023-6-12

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https://ww2.mathworks.cn/matlabcentral/answers/1982004-how-do-i-use-matlab-coder-to-generate-c-code-for-an-iir-filter-that-was-generated-by-designfilt

编辑： Raghava S N 2023-6-13

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.

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Answer 1

Raghava S N 2023-6-13

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https://ww2.mathworks.cn/matlabcentral/answers/1982004-how-do-i-use-matlab-coder-to-generate-c-code-for-an-iir-filter-that-was-generated-by-designfilt#answer_1254524

编辑：Raghava S N 2023-6-13

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: