how do i get a contour plot for this code?

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Aishwarya Bangalore Kumar
评论： Aishwarya Bangalore Kumar 2018-2-14
This is my code and I'm trying to get a contour plot for it. But I am not getting it. Can anyone help me
f=@(x,y) sin(x)+cos(y);
x0 = [5.5,5.5];
options = optimoptions('fminunc','Display','iter ','Algorithm','quasi-newton');
[opt, opt_cost]=fminunc('hw2pr2_cost',x0,options);
lb = (pi/2); ub = (2*pi);
options = optimoptions('fmincon','Display','iter','Algorithm','active-set');
[optx_con, opt_costcon] = fmincon('hw2pr2_cost',x0,[],[],[],[],lb,ub,'hw2pr2_constraint',options);
fcontour(f);
hold on
plot(opt(1),opt(2),'ko');
%contour(y,y,'ko');
hold on
plot(optx_con(1),optx_con(2),'ko');
%contour(y,y,'ko');
y=-x;
hold on
plot(x,y);
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Walter Roberson
Walter Roberson 2018-2-14
Yes, you should assign a value to x before running that code. It is not at all clear what you are expecting, though. Are you trying to plot a 45 degree angle from top left to bottom right? If so then there are other ways of doing that.
your plot(x,y) is not going to be a contour plot. fminunc() and fmincon() are going to return vectors of length 2 that you are plotting as individual points on top of the fcontour() result. The function you are plotting through fcontour() has nothing obvious to do with whatever hw2pr2_cost does.

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