Re: Why is there no 'math.round'?

[David Kastrup <dak@...>]

"troels knak-nielsen" <troelskn@gmail.com> writes:

> On Wed, Apr 23, 2008 at 2:36 PM, Bogdan Marinescu
> <bogdan.marinescu@gmail.com> wrote:
>> "is there any particularly strong reason why lua needs one?".
>>
>> Maybe because just about any decent math library out there has one ? Think I
>> ran in this problem myself a while ago.
>
> If I'm not mistaken, there are several competing ways of rounding a
> perfect half.

Sure.  But the optimal round-to-even strategy is non-trivial to
implement in a system-independent manner and/or in a high level
language.  But it is part of IEEE standards.  So it is rather cheap to
provide low-level, usually.

-- 
David Kastrup