From: Jeremy Yallop <jeremy.yallop@ed.ac.uk>
To: Fabrice Marchant <fabricemarchant@free.fr>
Cc: caml-list@yquem.inria.fr
Subject: Re: [Caml-list] functions' recursive construction
Date: Mon, 07 Jul 2008 21:40:36 +0100 [thread overview]
Message-ID: <48727F44.8010500@ed.ac.uk> (raw)
In-Reply-To: <20080707202839.272a4b0b@free.fr>
Fabrice Marchant wrote:
> After Coq, maybe could we program this in Lisp ?
Yes, although this is rather off-topic. Here are two solutions in
(rather rusty) Scheme, both zero-based again. A curried version:
(define (f n)
(cond
((zero? n) (lambda (x) x))
(#t (lambda (_) (f (- n 1))))))
Now
> ((f 0) 1)
1
> (((((f 3) 1) 2) 3) 4)
4
An uncurried version:
(define (f n)
(lambda args (list-ref args n)))
Now
> ((f 0) 1)
1
> ((f 3) 1 2 3 4)
4
Jeremy.
next prev parent reply other threads:[~2008-07-07 20:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-22 23:17 Damien Lefortier
2007-05-22 23:21 ` [Caml-list] " Jon Harrop
2007-05-22 23:31 ` Lukasz Stafiniak
2007-05-22 23:32 ` Lukasz Stafiniak
2007-05-22 23:41 ` Jon Harrop
2007-05-23 6:25 ` Jean-Christophe Filliatre
2008-07-07 18:01 ` Fabrice Marchant
[not found] ` <a58674cc0807071304x1640d670sde3045a0920a5922@mail.gmail.com>
2008-07-07 18:28 ` Fabrice Marchant
2008-07-07 20:40 ` Jeremy Yallop [this message]
[not found] ` <C3DD7276-23D5-41BE-A272-7579586A5559@gmail.com>
2008-07-07 18:36 ` Fabrice Marchant
2008-07-07 20:25 ` Jeremy Yallop
2008-07-07 19:11 ` Fabrice Marchant
2008-07-07 22:48 ` asmadeus77
2008-07-08 9:24 ` Daniel Bünzli
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