why do I need to add eps ?

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tomer polsky 2018-9-2

评论： tomer polsky 2018-9-2

hello I want to ask why do I need to add the value eps to this code ?

   x=-8:0.5:8;
   y=x';
   [xi,yi]=meshgrid(x,y);
  r=sqrt(xi.^2+yi.^2)+eps;
   z=sin(r)./r;
  mesh(x,y,z,r)

becouse for some reason if I do not add eps i get a hole in the top, why is that ?

Andrei Bobrov 2018-9-2

编辑：Andrei Bobrov 2018-9-2

To avoid the uncertainty of "0/0" situation when calculating z.

When x = 0 and y = 0.

tomer polsky 2018-9-2

ohh ok thank you very much

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