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Asked by ss4johnny Hall on 22 Aug 2013

I am considering an optimization where both the objective and non-linear constraint and functions of a function, such as (excluding some details):

f = @(w,Y) Y*w; g = @(w,Y) mean(f(w,Y)); h = @(w,Y) var(f(w,Y)); obj_con = @(w,Y) -g(w,Y); nonl_con = @(w,Y) deal(h(w,Y)-K,[]);

options = optimset('Algorithm','active-set');

out = fmincon(@(x) obj_con(x,Y),x0,[],[],Aeq,beq,lb,ub,@(x) nonl_con(x,Y),options);

I have purposefully made this simpler than what I actually plan to do to get the general point across (in particular, f and h will be more complicated and the optimization may take place with functions other than fmincon).

Using the Matlab profiler, I determined that the function f is called twice at each iteration of the optimization (once for g and once for h).

Is there any way to set up the optimization of the functions so that it is only called once?

One approach I am not interested in is to remove f and make the calculation within g and h. That still does not resolve the issue of having to make such a calculation twice.

Answer by Alan Weiss on 22 Aug 2013

Accepted answer

Objective and Nonlinear Constraints in the Same Function has the information you seek.

Alan Weiss

MATLAB mathematical toolbox documentation

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