MATLAB is not responding

Hello everybody, I am a beginner in Matlab and I have a problem with optimization using fmincon. I use an objective function file, a (non linear) constraints file and a script file which contains the fmincon function. When I run the last file Matlab's not responding.

These are the codes, thank you

 *objective function file:*

function [ C ] = objparadeigma4(var)
  % αντικειμενική συνάρτηση του προβλήματος 4
  L=30;
  V=80;
  D=var(1);
  W=var(2);

    C= 255*L+137*L*D^1.5+55500*W^0.5+10500*W^0.925+17000;

    % Δεν καταλαβαίνει τη μεταβλητή W, μάλλον επειδή δεν ξέρει μέχρι στιγμής το
    % D
    end
*constraints file*

function [c,ceq] = paradeigma4constraints(var)
% Περιέχει τους μη γραμμικούς περιορισμούς του προβλήματος 4
L=30;
V=80;
D=var(1);
W=var(2);

%Περιορισμοί
c=[];
ceq=[2.66*10^(-9)*(L*V^3)/D^5+1.78*10^(-10)*(L*V^2.68)/D^4.68-W];

end

script file

% script paradeigma4.m
% επιλύει το πρόβλημα 4
clc
L=30;
V=80;
D=var(1);
W=var(2);
var0=[1.1,0.25];

[D,W,C]=fmincon(@objparadeigma4,var0,[],[],[],[],0.25,6,@paradeigma4constraints);

disp('η βελτιστη τιμή της συναρτήσεως είναι c='),disp(C),disp('για D και για W = ')
disp(D),disp(W)

[Jan]

Do you mean that Matlab is busy? Is this a problem or an effect of the complexity of the calculations?

[Nikolaos]

Yes I mean that Matlab is busy continuously after that.

[Jan]

And you assume, that Matlab should be ready after some seconds already? Did you use the profiler to find out, where the time is spent in?

[Oleg Komarov]

I think it's all those comments in greek, Matlab is trying to tarnslate them but it's not very good at languages...

[Nikolaos]

Thank you, I'm trying the profiler and then using comments in English

Answer 1

[Selwyn]

As a debugging suggestion, take the semicolon out of your [D,W,C]=fmincon..... statement and watch for output at the command line.

It should show if things are moving or standing still. If its standing still then I'd guess its something inside fmincon, but if its moving and giving values for D,W and C that you expect then its just busy calculating things.

[Nikolaos]

Thank you I'll try it..!