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>>  function isinfinity(x) return x+1==x end
>
>Your isinfinity() won't work once you run out of mantissa bits (at around
>1e16 in IEEE doubles), where 1e16+1=1e16.

Ok, right. Sorry about that. On IEEE machines, you can use

  function isinfinity(x)
   if x>0 then return x==(1/0) else return x==(-1/0) end
  end

--lhf