Question

刚看数学建模matlab,下边这个程序为啥不出图？

刚看数学建模matlab,下边这个程序为啥不出图？clc,clear
a=0;
hold on
while a<0.05
c=[-0.05,-0.27,-0.19,-0.185,-0.185];
A=[zeros(4,1),diag([0.025,0.015,0.055,0.026])];
b=a*ones(4,1);
Aeq=[1,1.01,1.02,1.045,1.065];
beq=1;
LB=zeros(5,1);
[x,Q]=linprog(c,A,b,Aeq,beq,LB);
Q=-Q;
plot(a,Q,'*k');
a=a+0.001;
end
xlabel('x'),ylabel('Q')

Answer 1

这个程序为啥不出图？其原因是 hold on 位置不对。应该放在plot（）函数命令的后面。即

plot(a,Q,'*k');hold on

更改后运行，得到如下图形