-- d0 is what you judge as "is at about zero" for your input
-- select it such in size, that you don't get an "overflow" or
-- such that 1/d0 is your max ± vertical plot value (= clipping)
function f3 x
local d0=0.001
if abs(x-3) < d0 then
return empty -- don't plot in case of an empty return
else return 1/(x-3)
end f3
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