How to use "@" functionhandle for multiple inputs? (to use with fmincon)

Hallo,

I wrote a function (which works by itself), which can be called like this:

[output]=get_amps(input,par)

"output" can not be written as simple analytical function of "input".

Now I want to optimize the parameters "par" using fmincon:

input_a=a; % a is a vector in the workspace
par0=[100,5000];
out_a = @opt_a get_amps(input_a,par0); % here is the problem

objective = @opt_a sum((input_a-out_a).^2);
p_opt=fmincon(objective,par0);

In line3 I get the error:

" Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. ..."

How to use the @function handle with functions with multiple inputs?

Is there a better way to optimze parameters of a (non-analytical) function than fmincon?

I would be greatfull for any help.

best

Ralf

[Walter Roberson]

http://www.mathworks.com/help/matlab/math/parameterizing-functions.html

[Ralf Schmauder]

This was indeed helpfull! However, now I am strugeling how to use this with fmincon:

I can specify which parameters to optimize - but is there a way to specify data (input_a) without making it global?

Answer 1

[Matt J]

objective = @(p) sum(  ( a - get_amps(a, p) ).^2);

par0=[100,5000];

p_opt=fmincon(objective,par0);

[Ralf Schmauder]

Thank you, that was more usefull than the matlab documentation!