MATLAB system. The ' tf ' class does not support code generation.

Hello everyone, When I want to do a Matlab system in Simulink, I encountered some errors.

Then this is my Function code

    function out = NF(in,f_back12)
    %#codegen
    f1=f_back12;
    Wr=2*pi*f1;
    Sr=0.0707; 

    testNF=tf([1 (2*Wr*Sr) Wr^2],[1 (2*Wr*0.707) Wr^2]);
    out=in*testNF;
    end

Finally, it is an error occurred.

I want to how to generate the transfer function in Function?

Please help me, thank you

[Ryan Rizzo]

Same problem here! Did you solve this?

[Bartha Balazs]

I'm facing the sane issue :( did you found any solution ?

[punit mishra]

same problem here

[Mathieu NOE]

hello

if I were you, I would discretize all my filters in a script (if you start with continuous model , use c2dm )

then pass the parameters to the "discrete filter" block.

Answer 1

[Mohamed]

try to use this coder.extrinsic("tf")

[Taleb Vahabzadeh]

Thanks Mohamed.

Answer 2

[Saurabh]

Hi Zhao,

So, the objective is to generate code for the ‘tf’ class which is used inside the MATLAB Function block and when doing so it’s throwing an error that the ‘tf’ class does not support code generation.

The lines in the provided function that do not support code generation are definition of ‘testNF’.

The same can be found here:

https://www.mathworks.com/help/coder/ug/how-working-with-matlab-classes-is-different-for-code-generation.html#bt_v1ql

The possible workaround for this is to define a separate m-function on the path:

function testNF = mytf(Wr, Sr,)
testNF = tf([1 (2*Wr*Sr) Wr^2],[1 (2*Wr*0.707) Wr^2]); 
end

function out = NF(in,f_back12)
coder.extrinsic(‘mytf’)
%#codegen 
f1=f_back12;
Wr=2*pi*f1;
Sr=0.0707; 
testNF=mytf(Wr, Sr)
out=in*testNF;
end

‘coder.extrinsic’ declares a function as extrinsic and executes it in MATLAB. For more information about ‘coder.extrinsic’ refer to this link: https://www.mathworks.com/help/simulink/slref/coder.extrinsic.html?s_tid=doc_ta

Alternatively, one can use a ‘Transfer function’ block outside the ‘MATLAB function’ block and provide the input directly to the Function block, as discussed here:

https://www.mathworks.com/matlabcentral/answers/389421-simulink-does-not-support-code-generation-issue?s_tid=srchtitle

I hope this was helpful.