几种三维图画法

整理的很好，值得借鉴

n=100; 
a=1; 
b=1; 
x=linspace(-4,4,n); 
y=linspace(-4,4,n); 
[xx,yy]=meshgrid(x,y); 
zz=(sin(pi*xx/a)./((pi*xx)/a)).*(sin(pi*yy/b)./((pi*yy)/b)); 
plot3(xx,yy,zz); 
hidden off 
text(4,5,0.9,'z=sinc(x,y)')

n=100; 
a=1; 
b=1; 
x=linspace(-4,4,n); 
y=linspace(-4,4,n); 
[xx,yy]=meshgrid(x,y); 
zz=(sin(pi*xx/a)./((pi*xx)/a)).*(sin(pi*yy/b)./((pi*yy)/b)); 
mesh(xx,yy,zz); 
hidden off 
text(4,5,0.9,'z=sinc(x,y)')

n=100; 
a=1; 
b=1; 
x=linspace(-4,4,n); 
y=linspace(-4,4,n); 
[xx,yy]=meshgrid(x,y); 
zz=(sin(pi*xx/a)./((pi*xx)/a)).*(sin(pi*yy/b)./((pi*yy)/b)); 
surf(xx,yy,zz); 
hidden off 
text(4,5,0.9,'z=sinc(x,y)')