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Re: fix for expt bug
From: |
Ramakrishnan Muthukrishnan |
Subject: |
Re: fix for expt bug |
Date: |
Wed, 3 Nov 2010 23:55:00 +0530 |
On Wed, Nov 3, 2010 at 11:23 PM, Ramakrishnan Muthukrishnan
<address@hidden> wrote:
> On Wed, Nov 3, 2010 at 9:52 PM, Mark H Weaver <address@hidden> wrote:
>> Ramakrishnan and others,
>>
>> I just realized that there is a better way to fix these bugs. We don't
>> need a new top-level case in expt after all. Instead, we generalize the
>> scm_integer_expt case to support inexact integer exponents.
>>
>> Within that case, if the exponent is an inexact integer, then we make it
>> exact and make the base inexact, and then call scm_integer_expt.
>
> Mark,
>
> Why do we need to convert the base to inexact? is there any problem if
> they are just as it is and we convert only the exponent to exact when
> they are exact?
scheme@(guile-user)> (integer-expt (exact->inexact 3/2) (inexact->exact 4.0))
$17 = 5.0625
scheme@(guile-user)> (integer-expt 3/2 (inexact->exact 4.0))
$18 = 81/16
scheme@(guile-user)> (integer-expt (exact->inexact 3/2) (inexact->exact 4.0))
$19 = 5.0625
We want an output representation in an inexact form. For that reason,
we would want to do exact to inexact conversion of base. Is that
correct?
Mark, I guess your patch solves the problem in a much more efficient way.
thanks
--
Ramakrishnan
- Re: fix for expt bug, (continued)
- Re: fix for expt bug, Ramakrishnan Muthukrishnan, 2010/11/02
- Re: fix for expt bug, Ramakrishnan Muthukrishnan, 2010/11/02
- Re: fix for expt bug, Mark H Weaver, 2010/11/02
- Re: fix for expt bug, Ludovic Courtès, 2010/11/02
- Re: fix for expt bug, Mark H Weaver, 2010/11/02
- Re: fix for expt bug, Ramakrishnan Muthukrishnan, 2010/11/03
- Re: fix for expt bug, Mark H Weaver, 2010/11/03
- Re: fix for expt bug, Ramakrishnan Muthukrishnan, 2010/11/03
- Re: fix for expt bug, Mark H Weaver, 2010/11/03
- Re: fix for expt bug, Ramakrishnan Muthukrishnan, 2010/11/03
- Re: fix for expt bug,
Ramakrishnan Muthukrishnan <=
- Re: fix for expt bug, Ludovic Courtès, 2010/11/03
- Re: fix for expt bug, Mark H Weaver, 2010/11/04
- Re: fix for expt bug, Ludovic Courtès, 2010/11/08
- Re: fix for expt bug, Andy Wingo, 2010/11/20
- Re: fix for expt bug, Ludovic Courtès, 2010/11/21
- [PATCH] Fix bugs in expt and integer-expt, Mark H Weaver, 2010/11/04
- Re: [PATCH] Fix bugs in expt and integer-expt, Ludovic Courtès, 2010/11/10