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Re: Quiz: which is better 1 div $x or pow($x,-1)?

  • From: David Carlisle <d.p.carlisle@gmail.com>
  • To: Dimitre Novatchev <dnovatchev@gmail.com>
  • Date: Sat, 27 Jun 2020 21:04:45 +0100

Re:  Quiz: which is better 1 div $x or pow($x


On Sat, 27 Jun 2020 at 20:55, Dimitre Novatchev <dnovatchev@gmail.com> wrote:
> you didn't highlight it but -1 is a double so math:pow($x,-1) is quite a tricky function, math:pow($x(xs:int(-1)) with an integer power is much simpler to define.

In case the IEEE 754-2008 Standard for Floating-Point Arithmetic implements pown() with division when the exponent is a negative integer, then they actually transform expression (2) to expression (1), therefore it seems meaningful just to use expression (1).

Dimitre



Ah thanks for the correction.

David


 


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