From: Sven Luther <luther@dpt-info.u-strasbg.fr>
To: Christoph Bauer <c_bauer@informatik.uni-kl.de>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Need unsigned int
Date: Mon, 20 Jan 2003 21:58:20 +0100 [thread overview]
Message-ID: <20030120205820.GA3051@iliana> (raw)
In-Reply-To: <m3d6mrej5p.fsf@diebuntekuh.de>
On Mon, Jan 20, 2003 at 08:05:38PM +0100, Christoph Bauer wrote:
> Hi,
>
> my program need to calculate a hash key of a matrix (with dimension 8
> x 8). It is necessary that this calculation is very fast, so my
> program will update the hash key after every small modification of the
> matrix. My problem is that the hash key should be an unsigned int
> or an unsigned long in.
>
> My problem occurs here (Mersenne prime number 2^31-1):
> let big_prim = 2147483647
> val big_prim : int = -1
Solution #1 : buy yourself a 64bit box, and you will have integers upto
2^63-1 :)))
Solution #2 : Use the Int64 module.
Solution #3 : Use the ocaml bignum module.
Friendly,
Sven Luther
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next prev parent reply other threads:[~2003-01-20 20:58 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-20 19:05 Christoph Bauer
2003-01-20 20:58 ` Sven Luther [this message]
2003-01-22 14:55 ` Nicolas Cannasse
2003-01-23 15:00 ` Damien Doligez
2003-01-24 0:39 ` David Chase
2003-01-25 13:50 ` Nicolas Cannasse
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