From: Andy Wingo <wingo@pobox.com>
To: Mark H Weaver <mhw@netris.org>
Cc: guile-devel@gnu.org
Subject: Re: [PATCH] Fast R6RS div/mod; improved extensibility of numerics
Date: Mon, 31 Jan 2011 20:26:22 +0100 [thread overview]
Message-ID: <m3r5bsyiw1.fsf@unquote.localdomain> (raw)
In-Reply-To: <87vd15x9fu.fsf@yeeloong.netris.org> (Mark H. Weaver's message of "Mon, 31 Jan 2011 12:35:49 -0500")
On Mon 31 Jan 2011 18:35, Mark H Weaver <mhw@netris.org> writes:
> Andy Wingo <wingo@pobox.com> writes:
>>> The last patch might be slightly controversial. Although it does not
>>> make `integer-expt' a generic function, nonetheless it can now
>>> exponentiate _any_ scheme object that can be multiplied using `*'.
>>
>> To me this is fine, in principle; but I wonder about causing `(expt #t
>> 0)' to produce 1. It seems that in any case the range of the output
>> should be continuous -- i.e. if (expt <my-matrix> 1) produces a matrix,
>> and (expt <my-matrix> n) for n > 1 makes a matrix, then (expt
>> <my-matrix> 0) should also produce a matrix. Or no?
>
> When using generic arithmetic operators, there's no way to return
> objects of the correct type in all corner cases like this.
Well... OK! I'm feeling reckless, so I'm applying and pushing your
patch. Here goes nothing!
Andy
--
http://wingolog.org/
next prev parent reply other threads:[~2011-01-31 19:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-30 16:27 [PATCH] Fast R6RS div/mod; improved extensibility of numerics Mark H Weaver
2011-01-30 22:24 ` Andy Wingo
2011-01-30 22:55 ` Ludovic Courtès
2011-01-31 6:19 ` [PATCH] Rework the testing framework for number-theoretic division operators Mark H Weaver
2011-01-31 8:52 ` Andy Wingo
2011-01-31 17:14 ` [PATCH] Fast R6RS div/mod; improved extensibility of numerics Mark H Weaver
2011-01-31 17:35 ` Mark H Weaver
2011-01-31 19:26 ` Andy Wingo [this message]
2011-01-31 20:16 ` Andy Wingo
2011-01-31 20:30 ` Mark H Weaver
2011-01-31 20:46 ` Andy Wingo
2011-01-31 20:46 ` Mark H Weaver
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