How to record the function value for each iteration with using fmincon function.

clc, clear all

%Inıtial Guess
x0=[1,6];
%%
%Lower and upper bounds
LB=[-inf];
UB=[10];
%%
%fmincon function
[x,fval]=fmincon(@objfun,x0,[],[],[],[],LB,UB,@confun,[]);
%%
%Constraint Function
function [c,ceq]=confun(x)

%inequality constraints
c=[x(1)+x(2)-5];

%equality constraints
ceq=[];
end

%%

%Object Function
function [f]=objfun(x)
f=(x(1)^2-5*x(2));
end

[Walter Roberson]

Ok, suppose that you had the values. What would you do with them?

[IBRAHIM BOZTAS]

I just want to see how many iteration that I have and what is the fval and x values for each iteration.

[Walter Roberson]

Have you considered using the option for 'display', 'iter' ?

Have you considered using the option for 'plotfcn' so that the values are plotted during the calculation?

[Alan Weiss]

You might want to give 2-D bounds. You have a 2-D variable, but give bounds only on the first component.

These examples might also be of interest: Example of a Nested Output Function (uses base MATLAB) or for fmincon see Output Functions for Optimization Toolbox™.

Alan Weiss

MATLAB mathematical toolbox documentation