From: Wolfgang Schuster <schuster.wolfgang@gmail.com>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: A macro which gives a random name
Date: Sat, 18 Apr 2015 19:23:48 +0200 [thread overview]
Message-ID: <088338A7-A713-415A-9DF5-26804CDA9C7F@gmail.com> (raw)
In-Reply-To: <6DC048B9-D53F-46B3-973D-C25FD93D3C27@gmail.com>
> Am 18.04.2015 um 18:55 schrieb Otared Kavian <otared@gmail.com>:
>
> Hi everyone,
>
> In the example below I define a macro which chooses at random a name from a list of names. But I wonder whether this can be done in a more clever way without using a numerical macro created with math.random in Lua. The shortcoming of the macro below is that before hand I must know the nomber of elements in the list of names (for instance 5 in the example below), while it may happen that I need to create as many as random names that there are elements in the list, but sometimes I don’t know what is this number.
>
> Thanks for any insight and help.
> Best regards: OK
> %%%% begin random-names.tex
> \setuprandomize[2015] % set a seed
>
> \starttext
>
> \startluacode
> Name = {'F', 'G', 'u', 'v', 'W'}
> \stopluacode
>
> \define[3]\RandomName{%
> \setevalue{Named#1}{\ctxlua{tex.print(math.random(#2,#3))}}}
> \define\RandomFunctionName{\ctxlua{tex.print(Name[\NamedFunctionNumber])}}
>
> \dorecurse{10}{\RandomName{FunctionNumber}{1}{5}%
> Give an example of a function $\RandomFunctionName : {\Bbb R} \longrightarrow {\Bbb R}$ which has a derivative only at the origin, and such that $\RandomFunctionName(0) = 1$.\par \hairline\par}
>
> \stoptext
> %%%% begin random-names.tex
You can access the size of your Name table with #Name but have to replace # with \letterhash when you use it in a TeX command because # is already taken for the TeX arguments.
\starttext
\startluacode
Name = {'F', 'G', 'u', 'v', 'W'}
\stopluacode
\define\RandomFunctionName
{\startlua
local listsize = \letterhash Name ;
local randomvalue = math.random(1,listsize) ;
context(Name[randomvalue])
\stoplua}
\dorecurse{10}{Give an example of a function $\RandomFunctionName : {\Bbb R} \longrightarrow {\Bbb R}$ which has a derivative only at the origin, and such that $\RandomFunctionName(0) = 1$.\par \hairline\par}
\stoptext
Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___________________________________________________________________________________
next prev parent reply other threads:[~2015-04-18 17:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-18 16:55 Otared Kavian
2015-04-18 17:23 ` Wolfgang Schuster [this message]
2015-04-18 19:16 ` Otared Kavian
2015-04-18 20:24 ` Otared Kavian
2015-04-18 20:36 ` Hans Hagen
2015-04-19 7:51 ` Otared Kavian
2015-04-19 9:55 ` Hans Hagen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=088338A7-A713-415A-9DF5-26804CDA9C7F@gmail.com \
--to=schuster.wolfgang@gmail.com \
--cc=ntg-context@ntg.nl \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).