matlab报错Z must be a matrix, not a scalar or vector,哪里出错了?

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matlab报错Z must be a matrix, not a scalar or vector,哪里出错了?
代码为：
x=-3:0.01:3;
y=--2:0.01:2;
[x,y]=meshgrid(x,y);
f=(4-2.1*x.^2+(x.^4)./3).*x.^2+x.*y+(-4+4*y.^2).*y.^2;
mesh(x,y,f);
运行后报错：
Error using mesh (line 76)
Z must be a matrix, not a scalar or vector
Error in picture3 (line 5)
mesh(x,y,f);
请问是哪里出错了?是f=(4-2.1*x.^2+(x.^4)./3).*x.^2+x.*y+(-4+4*y.^2).*y.^2;出错了吗?

y=--2:0.01:2;
这一句多了个负号

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