In [2]:

x=[];y=[];z=[]
-10.step(10, 0.5) do |i|
  -10.step(10, 0.5) do |j|
    x.push(i)
    y.push(j)
    z.push(Math.sin(Math.sqrt(i*i+j*j))/Math.sqrt(i*i+j*j))
  end
end
z.map!{|val| next (val.nan? ? 0 : val)} #(0,0) will be -inf

Out[2]:

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