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why do I need to add eps ?

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tomer polsky
tomer polsky on 2 Sep 2018
Commented: tomer polsky on 2 Sep 2018
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 ?

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Answers (1)

Andrei Bobrov
Andrei Bobrov on 2 Sep 2018
Edited: Andrei Bobrov on 2 Sep 2018
To avoid the uncertainty of "0/0" situation when calculating z.
When x = 0 and y = 0.

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tomer polsky
tomer polsky on 2 Sep 2018
ohh ok thank you very much

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