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[ Last edited by sunxiao on 2009-3-9 at 09:02 ]
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madcai(½ð±Ò+1,VIP+0):sÊǸıä¼ýÍ·µÄ³¤¶È,²¢²»Äܸıä´Öϸѽ
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[x,y]=meshgrid(-2:.2:2,-1:.15:1);

z=x.*exp(-y.^2);

[px,py]=gradient(z,.2,.15);

contour(x,y,z);

hold on,quiver(x,y,px,py),axis image

¶à±ßÐεÄÌîÉ«fill(x,y,c)

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quiver(...,scale) automatically scales the arrows to fit within the grid and then stretches them by the factor scale. scale = 2 doubles their relative length, and scale = 0.5 halves the length.
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