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function z=banana(x,y)
z=100*(y-x.^2).^2+(1-x).^2;
%z=100*(x(2)-x(1).^2).^2+(1-x(1)).^2;
x=-2:0.1:2;
y=-2:0.1:2;
[X,Y]=meshgrid(x,y);
Z=banana(X,Y);
subplot(131)
mesh(X,Y,Z)
subplot(132)
fh=@(x,y)100*(y-x.^2).^2+(1-x).^2;%º¯Êý¾ä±ú
ezmesh(fh,[-2 2])
subplot(131)
syms x y;%¶¨Òå·ûºÅ±äÁ¿
f=100*(y-x^2)^2+(1-x)^2;
ezmesh(f,[-2,2])
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