Using function of multiple variables in fmincon

Question

0 个投票

I define a function in a separate .m file as:

 function [y]=myfun(r,t,m,n,p)
 syms r,t,p;
 y=limit(diff((p.*exp(1+r.*cos(t)),r,n)),p,1);
 end

I want to use this function in fmincon to minimize over the variables 'r' and 't'.Comments on this problem are welcome. Thanks in advance.

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Answer 1

Matt J 2018-9-17

编辑：Matt J 2018-9-17

1 个投票

You want to re-implement myfun as

 function y=myfun(unknowns, n)
    r=unknowns(1);
    t=unknowns(2);
   y = (cos(t).^n) * exp(1+r.*cos(t));
 end

and then

fmincon(@(x) myfun(x,n), [r0,t0], ...other arguments...)

Matt J 2018-9-17

编辑：Matt J 2018-9-17

Following my example or the examples here, you can pass whatever known parameters you want to the function, in addition to the unknowns.

You can also always use matlabFunction to convert a symbolic expression to a non-symbolic Matlab function for use with fmincon, or whatever.

Shrobona Bagchi 2018-9-21

Thank you for link on additional parameters. It solved the problem.