how to implement symbolic matlab function on simulink?

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Fatma Abdullah
Fatma Abdullah 2017-10-17
评论： Walter Roberson 2017-11-2
im trying to implement the following function on matlab function on simulink but error 'syms is not supported for a stand alone code generation' occures
function fkt = fcn(c,p,k,N)
syms t
ft=p^(-c/2)*(c/2)*t.^((c/2)-1).*exp(-(t./p).^(c/2));
Ft=1-exp(-(t/p).^(c/2));
fkt=k*nchoosek(N/2,k)*(1-Ft)^(N/2-k)*(Ft)^(k-1)*ft
end
  2 个评论
Nicolas Schmit
Nicolas Schmit 2017-10-18
Simulink works only with numerical data. Why do you need to use the Symbolic Toolbox in a MATLAB function?
Fatma Abdullah
Fatma Abdullah 2017-10-18
um working on paper to try to simulate complicated system with calculations of integration and convolution that are almost impossible to be evaluated in matlab.....um taking the easy way instead of complicated matlab programing

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回答（1 个）

Sean de Wolski
Sean de Wolski 2017-11-2
You can do this by putting syms inside of a function called by a MATLAB Function block where the inner function is flagged as extrinsic:
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Fatma Abdullah
Fatma Abdullah 2017-11-2
i'm trying to generate code for standalone work, not in acceleration mode
Walter Roberson
Walter Roberson 2017-11-2
In that case, extrinsic is not going to work, unfortunately. You will need to use a MATLAB Function block for at least the nchoosek; perhaps it would be easier to put it all into a MATLAB Function block to do the
(c*k*t^(c/2 - 1)*exp(-(t/p)^(c/2))^(N/2 - k + 1)*nchoosek(N/2, k)*(1 - exp(-(t/p)^(c/2)))^(k - 1))/(2*p^(c/2))

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