Anonymous function alternative for MATLAB Coder?

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Mike Wa
Mike Wa on 28 Jul 2015
Answered: Ryan Livingston on 29 Jul 2015
I'm using fmincon and would like to export my code to C++ via MATLAB Coder. However, my objective function uses more arguments than just the variable being optimised. To allow this, I use an anonymous function handle for my objective function:
idealx=fmincon(@(x)obj_fun(x,y,z,...),...);
MATLAB Coder does not support anonymous functions. What alternative can I use to pass additional objective function arguments that MATLAB Coder supports?
  1 Comment
Ryan Livingston
Ryan Livingston on 29 Jul 2015
MATLAB Coder unfortunately does not support fmincon either since it isn't in the list of supported functions.

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Answers (2)

Muthu Annamalai
Muthu Annamalai on 28 Jul 2015
Edited: Muthu Annamalai on 28 Jul 2015
You may write out your function with extra arguments as object.
First define this class,
classdef FcnWithArgs
properties
a
b
c
end
methods
function obj = FcnWithArgs(a,b,c)
obj.a = a;
% etc.
end
function yval = invoke(obj,xval)
yval = original_function( xval, obj.a, obj.b, obj.c )
end
end
end
Next you can make an instance of this class and use it with fmincon This could be codegen compatible. Worth a try.

Ryan Livingston
Ryan Livingston on 29 Jul 2015
For the general issue of replacing an anonymous function for code generation, see this question on fminsearch that describes modelling an anonymous function using persistent variables.

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