wan
Posts:
1
Registered:
12/20/11


Optimization terminated: No feasible solution found.
Posted:
Dec 20, 2011 2:53 AM


Friends, I try to run a program by fmincon,but I got an error:Optimization terminated: No feasible solution found.Search direction less than 2*options.TolX but constraints are not satisfied.and I don't know what is my mistake... "myfun.m" function f=myfun(x) f=2.20*x(1)*(x(1)1)^2/(x(1)2)+2.20*x(1)*x(2)*(x(2)1)^2/(x(2)2)+2.42*x(1)*x(2)*x(3)*(x(3)1)^2/(x(3)2)+2.75*x(1)*x(2)*x(3)*x(4)*(x(4)1)^2/(x(4)2); and "mycon2.m" function[c,ceq]=mycon2(x) g(1)=1(x(2)*(x(1)2)/(x(2)2))^1/3*(x(2)1)/(x(1)1); g(2)=(x(2)*(x(1)2)/(x(2)2))^1/3*(x(2)1)/(x(1)1)1.2; g(3)=1(1.1*x(3)*(x(2)2)/(x(3)2))^1/3*(x(3)1)/(x(2)1); g(4)=(1.1*x(3)*(x(2)2)/(x(3)2))^1/3*(x(3)1)/(x(2)1)1.2; g(5)=1(1.13636*x(4)*(x(3)2)/(x(4)2))^1/3*(x(4)1)/(x(3)1); g(6)=(1.13636*x(4)*(x(3)2)/(x(4)2))^1/3*(x(4)1)/(x(3)1)1.2; c=[g(1);g(2);g(3);g(4);g(5);g(6)]; ceq=[1590.192x(1)*x(2)*x(3)*x(4)]; command window: >>x0=[7.2 7.2 7.5 4.09]; >>lb=[4;5;5;4]; >>ub=[8;8;8;5.6]; >>options=optimset('largescale','off','maxfunevals',1000000); >>[x,fval]=fmincon(@myfun,x0,[],[],[],[],lb,ub,@mycon2,options) when I try to run the script, I get these messages errors: Optimization terminated: No feasible solution found. Search direction less than 2*options.TolX but constraints are not satisfied. x =
15.7056 10.0989 2.7056 3.7056
fval =
9.8284e+003 Any help is very much appreciated.Wish you a nice day!

