why can't i plot this function? :(

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Hassan Dehghani
Hassan Dehghani 2014-5-29
评论： Hassan Dehghani 2014-5-29
I'm trying to plot this function. It gives me the following error.
Warning: Matrix is singular to working precision
I'm using Matlab 2011a.
G=@(x1,x2)(-(1+cos(12*sqrt(x1^2+x2^2)))/(0.5*(x1^2+x2^2)+2));
x=-5:.1:5; y=-5:.1:5; [x1 x2]=meshgrid(x,y);
mesh(x2,x1,G(x1,x2))

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David Sanchez
David Sanchez 2014-5-29
Try it this way:
x = -5:.1:5;
y = -5:.1:5;
[x1 x2] = meshgrid(x,y);
G2 = -(1+cos(12.*sqrt(x1.^2+x2.^2)))./(0.5.*(x1.^2+x2.^2)+2);
mesh(x2,x1,G2)

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