MATLAB is not responding
显示 更早的评论
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)
5 个评论
Jan
2012-2-15
Do you mean that Matlab is busy? Is this a problem or an effect of the complexity of the calculations?
Nikolaos
2012-2-16
Jan
2012-2-16
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
2012-2-17
I think it's all those comments in greek, Matlab is trying to tarnslate them but it's not very good at languages...
Nikolaos
2012-2-17
采纳的回答
Selwyn
2012-2-17
0 个投票
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.
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Variables 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
