matlab中Warning:Matrix is singular to working precision.应该怎么解

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matlab中Warning:Matrix is singular to working precision.应该怎么解决,绘制三维图,
syms x y
x=0:0.05:2;
y=-2:0.1:2;
[X,Y]=meshgrid(x,y);
f=sqrt(1+X.^2+2*X*cos(Y+2*pi/3)/sqrt(1+X.^2+2*X*cos(Y)));
surf(X,Y,f);
我想绘制三维图形

x=0:0.05:2;
y=-2:0.1:2;
[X,Y]=meshgrid(x,y);
f=sqrt(1+X.^2+2*X.*cos(Y+2*pi/3)./sqrt(1+X.^2+2*X.*cos(Y))); % 点乘、点除
surf(X,Y,f);

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