From: tar@sevak.isi.edu (Thomas A. Russ)
To: help-gnu-emacs@gnu.org
Subject: Re: Random number generation in LISP or using it
Date: 10 Jun 2009 11:21:09 -0700 [thread overview]
Message-ID: <ymiy6s0lzl6.fsf@blackcat.isi.edu> (raw)
In-Reply-To: 0c194ee2-6347-4a46-8932-37d144e9265a@z7g2000vbh.googlegroups.com
bolega <gnuist006@gmail.com> writes:
> The function "random" does not work in emacs.
How does it not work?
It seems to work for me.
> start line and end line of a marked region and then use that to
> disorder (or re-order) the lines according to a list of random numbers
> generated ?
You could look up shuffling algorithms.
http://en.wikipedia.org/wiki/Shuffle#Shuffling_algorithms
http://en.wikipedia.org/wiki/Fisher-Yates_shuffle
[snip]
> In this case one needs to generate a random number that is an integer
> and lies between the lines start and end of region. It can be done by
> some modulo type operation if available in emacs lisp.
You shouldn't need to do that, since the built-in RANDOM function can do
that for you. Try ^H f random <CR>
--
Thomas A. Russ, USC/Information Sciences Institute
next prev parent reply other threads:[~2009-06-10 18:21 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-10 15:21 Random number generation in LISP or using it bolega
2009-06-10 15:26 ` bolega
2009-06-10 18:04 ` Colin S. Miller
2009-06-10 18:56 ` Lennart Borgman
2009-06-10 18:21 ` Thomas A. Russ [this message]
2009-06-10 18:21 ` Thomas A. Russ
2009-06-10 21:57 ` Xah Lee
2009-06-11 7:34 ` TomSW
2009-07-08 11:54 ` Mario Lang
2009-07-08 12:57 ` Pascal J. Bourguignon
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