From: bolega <gnuist006@gmail.com>
To: help-gnu-emacs@gnu.org
Subject: Re: lambda inside a let or letrec
Date: Wed, 9 Jun 2010 23:18:25 -0700 (PDT) [thread overview]
Message-ID: <571723a4-e5b3-403a-b856-fb377ee68c73@c10g2000yqi.googlegroups.com> (raw)
In-Reply-To: 3f3fa71f-f6a5-43e7-9736-c4bfc013141c@e5g2000yqn.googlegroups.com
On Jun 9, 10:37 pm, bolega <gnuist...@gmail.com> wrote:
> let me write it more clearly with indents as follows :
>
> (let
> ((a (lambda (n) (+ 1 n)))
> (b 3))
> (a b))
>
> On Jun 9, 10:34 pm, bolega <gnuist...@gmail.com> wrote:
>
> > My apologies in advance to comp.lang.scheme and comp.lang.lisp.
>
> > I am trying to run a certain syntax inside emacs lisp.
>
> > I know basically how let works
>
> > (let (list of pairs of var value) (function))
>
> > This is like a lambda function call , only the order is different.
>
> > But the novelty i saw reading a book on common lisp or scheme is this
> > and i failed to run in emacs. plz tell what modifications are needed
> > and i know they are different.
>
> > ( (lambda (n) (+ 1 n)) 3) ;;; works in emacs
>
> > (let
> > ((a (lambda (n) (+ 1 n))) (b 3)) (a b)) ;;; does NOT work in emacs
>
> > basically we are trying to use / abuse the let in that in the pair we
> > define a equal to a lambda. Then another pair where a value of b is
> > defined.
>
> > next, we want a to operate on b.
>
> > Why does it fail ?
>
> > The scheme/lisp book/paper where it was seen (forgot) used letrec.
>
> > Can someone enlighten me how set! and let can be used to formulate
> > recursion when the let has no recursion built in it ?
>
> > thanks a lot.
> > cheers
The following works where I have replaced the association of lambda to
a _by_ the association of lambda function call to a, ie a numerical
value.
(let
((a ((lambda (n) (+ 1 n)) 5))
(b 3))
(+ a b))
I am sure I am making some trivial mistake
next prev parent reply other threads:[~2010-06-10 6:18 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-10 5:34 lambda inside a let or letrec bolega
2010-06-10 5:37 ` bolega
2010-06-10 6:18 ` bolega [this message]
2010-06-10 5:37 ` bolega
2010-06-10 7:22 ` Helmut Eller
2010-06-10 14:28 ` Pascal J. Bourguignon
2010-06-11 0:42 ` bolega
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