作业帮这个程序哪里出问题了,该怎么修改?目标函数：function f=myfun(x)f=2.5*x(1)+0.25*x(2)+0.012*x(2)*x(3)+10;约束文件：function[c,ceq]=mycon(x)c(1)=(1.82*10^5)/(x(3)^2)-225;c(2)=[((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2]-150;c(3)=((1.
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/20 03:27:22
![这个程序哪里出问题了,该怎么修改?目标函数：function f=myfun(x)f=2.5*x(1)+0.25*x(2)+0.012*x(2)*x(3)+10;约束文件：function[c,ceq]=mycon(x)c(1)=(1.82*10^5)/(x(3)^2)-225;c(2)=[((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2]-150;c(3)=((1.](/uploads/image/z/472500-36-0.jpg?t=%E8%BF%99%E4%B8%AA%E7%A8%8B%E5%BA%8F%E5%93%AA%E9%87%8C%E5%87%BA%E9%97%AE%E9%A2%98%E4%BA%86%2C%E8%AF%A5%E6%80%8E%E4%B9%88%E4%BF%AE%E6%94%B9%3F%E7%9B%AE%E6%A0%87%E5%87%BD%E6%95%B0%EF%BC%9Afunction+f%3Dmyfun%28x%29f%3D2.5%2Ax%281%29%2B0.25%2Ax%282%29%2B0.012%2Ax%282%29%2Ax%283%29%2B10%3B%E7%BA%A6%E6%9D%9F%E6%96%87%E4%BB%B6%EF%BC%9Afunction%5Bc%2Cceq%5D%3Dmycon%28x%29c%281%29%3D%281.82%2A10%5E5%29%2F%28x%283%29%5E2%29-225%3Bc%282%29%3D%5B%28%280.008%2Ax%281%29%2B1%29%2A1.5%2A%2810%5E5%29%29%2F0.89%2Ax%281%29%5E2%5D-150%3Bc%283%29%3D%28%281.)
这个程序哪里出问题了,该怎么修改?目标函数：function f=myfun(x)f=2.5*x(1)+0.25*x(2)+0.012*x(2)*x(3)+10;约束文件：function[c,ceq]=mycon(x)c(1)=(1.82*10^5)/(x(3)^2)-225;c(2)=[((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2]-150;c(3)=((1.
这个程序哪里出问题了,该怎么修改?
目标函数：
function f=myfun(x)
f=2.5*x(1)+0.25*x(2)+0.012*x(2)*x(3)+10;
约束文件：
function[c,ceq]=mycon(x)
c(1)=(1.82*10^5)/(x(3)^2)-225;
c(2)=[((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2]-150;
c(3)=((1.61*1e6)/(x(1)^2))-[(0.008*x(1)+1)*8.33*10^5/(0.89*(x(1)^2))]-150;
c(4)=0.5*(1.82*10^5)/(x(3)^2)+0.5*[(0.008*x(1)+1)*1.5*(10^5)/(0.89*x(1)^2)]-150;
c(5)=0.5*(1.82*10^5)/(x(3)^2)+0.5*[(1.61*(1e6)/(x(1)^2))-[(0.008*x(1)+1)*8.33*(10^5)/(0.89*x(1)^2)]-150;
ceq=[ ];
优化命令：
x0=[50,40,30];
options=optimset('display','iter','largescale','off')
[x,fval,exitflag,output]=fmincon(@myfun,x0,[],[],[],[],[],[],@mycon,options)
错误提示：
Error:File:C:\Documents and Settings\Administrator\桌面\a\mycon.m Line:7 Column:4
Assignment statements do not produce results.(Use == to test
for equality.)
Error in ==> C:\Documents and Settings\Administrator\桌面\a\Untitled3.m
On line 3 ==> [x,fval,exitflag,output]=fmincon(@myfun,x0,[],[],[],[],[],[],@mycon,options)
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这个程序哪里出问题了,该怎么修改?目标函数：function f=myfun(x)f=2.5*x(1)+0.25*x(2)+0.012*x(2)*x(3)+10;约束文件：function[c,ceq]=mycon(x)c(1)=(1.82*10^5)/(x(3)^2)-225;c(2)=[((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2]-150;c(3)=((1.
把约束条件里的方括号 改为圆括号!
function [c,ceq]=mycon(x)
c(1)=(1.82*10^5)/(x(3)^2)-225;
c(2)=(((0.008*x(1)+1)*1.5*(10^5))/0.89*x(1)^2)-150;
c(3)=((1.61*1e6)/(x(1)^2))-[(0.008*x(1)+1)*8.33*10^5/(0.89*(x(1)^2))]-150;
c(4)=0.5*(1.82*10^5)/(x(3)^2)+0.5*((0.008*x(1)+1)*1.5*(10^5)/(0.89*x(1)^2))-150;
c(5)=0.5*(1.82*10^5)/(x(3)^2)+0.5*((1.61*(1e6)/(x(1)^2))-((0.008*x(1)+1)*8.33*(10^5)/(0.89*x(1)^2))-150);
ceq=[ ];
结果:
x =
1.0e+04 *
0.0007 0.0040 2.5301
fval =
1.2183e+04
exitflag =
0
output =
iterations: 75
funcCount: 303
lssteplength: 2
stepsize: 0.1082
algorithm: 'medium-scale: SQP, Quasi-Newton, line-search'
firstorderopt: 303.8591
constrviolation: 1.0010e+07
message: [1x142 char]
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