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å½æ°å¾ z = xexp(-x^2-y^2) 为ä¾è®²è§£åºæ¬æä½ï¼é¦å
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xa = -2:0.2:2;
ya = xa;
[x,y] = meshgrid(xa,ya);
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% calculate z data
z = x.*exp(-x.^2 - y.^2);
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mesh(x,y,z);
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