请问高手这怎么改啊，在matlab中的修改？

[x,y]=meshgrid([0:0.1:1],[-3:0.1:3]);
z=y-x.^2/9;
surf(x,y,z);
>> [x,y]=meshgrid([0.1:0.05:1],[2000:100:2900]);
z=y-x.^2/9;
surf(x,y,z);
>> [x,y]=meshgrid([0.1:0.05:1],[2000:100:2900]);
z=y-y*x.^2/9;
surf(x,y,z);
??? Error using ==> mtimes
Inner matrix dimensions must agree.

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[x,y]=meshgrid([0.1:0.05:1],[2000:100:2900]);
z=y-y.*x.^2/9;
surf(x,y,z);

只需肢蔽改要在y-y后面加一个.就行了历判，因为在Matlab里并好面数组与数组的相乘是里面元素的乘法都是点乘

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