How can I use anonymous function / cfit in simulink ?

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Ezor
Ezor 2017-1-10
评论： James Whidborne 2021-2-20
Hello everyone,
I have created several models stored as anonymous functions or cfit objects (I can change for one another, depending on what is the best in that case) in the main workspace.
I would like to use them in Simulink, namely take as input a signal u, and use my function f on it f(u) = y where y will be the output signal in simulink.
So far, I have tried to call them in Matlab Function Block but it doesn't work. For instance, with coder.extrinsic
function y = fcn(u)
y=0;
coder.extrinsic('evalin')
coder.extrinsic('my_fun_in_WS')
fun = evalin('base','my_fun_in_WS');
y = fun(u);
end
It seems that u has not the right type since I get this error Function output 'y' cannot be an mxArray in this context. Consider preinitializing the output variable with a known type.
However, if I put
y = feval(fun,42);
Then the output is correct (constant, equal to fun(42))
Do you have any solution to workout this issue?
Thank you in advance (and sorry for bad english)
Edward

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回答（1 个）

Sean de Wolski
Sean de Wolski 2017-1-12
编辑：Sean de Wolski 2017-1-13
See my answer here:
http://www.mathworks.com/matlabcentral/answers/316742-i-have-a-knn-classification-model-i-want-to-simulate-the-same-in-simulink#answer_247057
EDIT In R2016b, anonymous functions are supported for code generation and thus can be used directly inside of the MATLAB function block:
For cfit, sfit objects you will still need to call those inside of a separate MATLAB function labeled as coder.extrinsic in the MATLAB function block.
  4 个评论
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Ezor
Ezor 2017-1-16
Unfortunatly, I have to work on Matlab2014a, but it's good to know !
Wes Yeagley
Wes Yeagley 2018-1-22
Could you show an example where you use a cfit object in Simulink. I am having trouble calling the cfit object in a separate Matlab function and thus cannot use it in Simulink.

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