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  [X,Y] = meshgrid(-2:.2:2,-2:.2:3);   
Z = X.*exp(-X.^2-Y.^2);  
[C,h] = contour(X,Y,Z);     
set(h,'ShowText','on','TextStep',get(h,'LevelStep')*2)

  [C,h] = contour(X,Y,Z,20);

[C,h] = contour(X,Y,Z,v);

clear all;clc;
[X,Y] = meshgrid(-2:.2:2,-2:.2:3);   
Z = X.*exp(-X.^2-Y.^2);  
[C,h] = contour(X,Y,Z,10);   
set(h,'ShowText','off')
hold on;
[C1,h1] = contour(X,Y,Z,5);
set(h1,'ShowText','on')

2Â¥: Originally posted by ju5200 at 2014-03-12 17:15:39
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clear all;clc;
= meshgrid(-2:.2:2,-2:.2:3);   
Z = X.*exp(-X.^2-Y.^2);  
= contour(X,Y,Z,10);     ...