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Re: [Chicken-users] Different factorial results
From: |
Peter Bex |
Subject: |
Re: [Chicken-users] Different factorial results |
Date: |
Fri, 3 Jun 2011 19:06:43 +0200 |
User-agent: |
Mutt/1.4.2.3i |
On Fri, Jun 03, 2011 at 12:49:26PM -0400, John Cowan wrote:
> Steve Graham scripsit:
>
> > Thanks, Mario. Worked like a charm. Why is that not part of the base
> > package?
>
> Licensing. The numbers egg has to be GPL, because it depends on the GMP
> (GNU Multi-precision Library) which is GPL.
This is no longer true and hasn't been for over a year now.
The current "numbers" code is a heavily modified version of Scheme48's
code, which is itself based on the MIT Scheme code which was BSD-licensed
at some point in time.
> The overall license for Chicken, however, is BSD.
> There are alternatives to the GMP, but it is
> the gold standard: fast, accurate, space-conserving.
The GMP-based numbers egg was actually very slow because it made heavy
use of finalizers and malloc()ed memory. The new code is a bit faster.
Probably a GMP-based numbers egg which uses Chicken-managed memory would
be faster still, but the license annoys me and I still have hopes to get
bignums in Chicken core someday :)
It's not in core mostly because it would make things slower (though I'm
not 100% convinced of that; there's type dispatching for fixnums/flonums
already anyway) and because it is an extra-large additional pile of code.
Cheers,
Peter
--
http://sjamaan.ath.cx
--
"The process of preparing programs for a digital computer
is especially attractive, not only because it can be economically
and scientifically rewarding, but also because it can be an aesthetic
experience much like composing poetry or music."
-- Donald Knuth
- [Chicken-users] Different factorial results, Steve Graham, 2011/06/03
- Re: [Chicken-users] Different factorial results, Mario Domenech Goulart, 2011/06/03
- Re: [Chicken-users] Different factorial results, Steve Graham, 2011/06/03
- Re: [Chicken-users] Different factorial results, John Cowan, 2011/06/03
- Re: [Chicken-users] Different factorial results, Mario Domenech Goulart, 2011/06/03
- Re: [Chicken-users] Different factorial results, Kon Lovett, 2011/06/03
- Re: [Chicken-users] Different factorial results,
Peter Bex <=
- Re: [Chicken-users] Different factorial results, Alex Queiroz, 2011/06/03
- Re: [Chicken-users] Different factorial results, Steve Graham, 2011/06/03
- Re: [Chicken-users] Different factorial results, Jim Ursetto, 2011/06/03