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Re: st: looping over parallel lists - is there a alternative to "for"?


From   "Ada Ma" <heu034@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: looping over parallel lists - is there a alternative to "for"?
Date   Thu, 16 Mar 2006 11:45:19 +0000

I suppose you can have three globals and then have one loop to loop
through them?  Some samples can be found in C Baum's "A little bit of
Stata programming goes a long way ..."

http://www.stata.com/meeting/11uk/baum.pdf

I quite like the -for- command as well, sometimes I only want to loop
one line of command and using commands like -forvalue- and -foreach-
gets a bit complicated.  And speaking for myself, using -for- would
save me from making typos like using ) instead of }.



On 3/16/06, Gawrich Stefan <s.gawrich@hlpug.hessen.de> wrote:
> Hi,
>
> I do a lot of routine or repetitive data analysis and use loops and lists
> frequently (btw, thx to Nick Cox, his "How to fact lists with fortitude"
> helped me a lot).
>
> I'm wondering why the "for"-command is officialy out of date in Stata while
> one of it's best features  - the use of parallel lists - can't be done
> otherwise. Or am I missing something?
>
> One example: I routinely map ten different diseases with tmap and save the
> maps as a graphic file.
>
> for var var1-var10 \ any "Disease1" "Disease2" [...] \ any "Filename1"
> "Filename2" [...] : ///
> tmap choro X, id(county) map("county-Coordinates.dta") title("Y") \ graph
> export "Z.png", replace
>
> In this example each graph is determined by something like a 3-tuple of
> variable, title and saving-filename.
> This is just basic code, in real life the code blows up and becomes hard to
> read, as we all know, "for" has some disadvantages.
> So if it can be done in a more structured manner, I would like to know...
>
> Best wishes
>
> Dr. Stefan Gawrich
> Hesse State Health Office
> Wolframstr. 33
> 35683 Dillenburg
>
>
>
>
>
>
>
>
>
> *
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>


--
Ada Ma
Research Fellow
Health Economics Research Unit
University of Aberdeen, UK.
http://www.abdn.ac.uk/heru/
Tel: +44 (0) 1224 553863
Fax: +44 (0) 1224 550926

*
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