From: Jianzhou Zhao <jianzhou@seas.upenn.edu>
To: Olivier Schwander <olivier.schwander@chadok.info>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] convertion between OCaml Big_int and C
Date: Wed, 13 Oct 2010 12:01:49 -0400 [thread overview]
Message-ID: <AANLkTi=JMqjjZdo5dbuUQkz8NOJwQpzjk+XPC1Wcpefg@mail.gmail.com> (raw)
In-Reply-To: <20101013144829.GB28174@pomerol.lix.polytechnique.fr>
On Wed, Oct 13, 2010 at 10:48 AM, Olivier Schwander
<olivier.schwander@chadok.info> wrote:
> Le 13 Oct 2010 10:26, Jianzhou Zhao a écrit:
>> I am not sure if this is a reasonable question. Does OCaml already
>> have functions that do convertion between arbitrary-precision integers
>> big_int in OCaml and any representation of large intergers in C? The
>> implementation of big_int (otherlibs/num/big_int.*) uses nat
>> (otherlibs/num/nat.*). Nat is a customized allocation (in C) as a list
>> of native integers to represent arbitrary-precision. So converting
>> big_int into C seems possible to me.
>
> It seems you should have a look at the numerix library or at the OCaml
> binding for GMP. I never used any of them so I cannot guaranty there are
> really working (there are not a lot of references to them) but I think
> they are more likely to be usable on both OCaml and C side.
Thanks. Are they the MLGMP and Numerix listed in "the Caml Hump:
General purpose libraries :: Numeric computation" ?
http://caml.inria.fr/cgi-bin/hump.en.cgi?sort=0&browse=75
>From the documents of Numerix, it runs much faster than the big_int
library, although it may not be as portable as the 'nat' that big_int
replies on.
>
> Cheers,
>
> Olivier
>
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--
Jianzhou
next prev parent reply other threads:[~2010-10-13 16:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-13 14:26 Jianzhou Zhao
2010-10-13 14:48 ` [Caml-list] " Olivier Schwander
2010-10-13 16:01 ` Jianzhou Zhao [this message]
2010-10-13 16:11 ` Olivier Schwander
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