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st: AW: RE: Number of a subset of variables in local


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: RE: Number of a subset of variables in local
Date   Thu, 19 Aug 2010 15:45:31 +0200

<> 

Also, Sven, you want to be extra careful when applying both solutions to a
large project, i.e. many members of the -varlist- "name*":

*************
clear*

forv i=1/100{
	gen name`i'=.
}

unab myvars1: name*
local mycount1=wordcount("`myvars1'")

qui d name*, varlist
*local myvars2 `r(varlist)'
local myvars2 =r(varlist)
local mycount2: list sizeof myvars2
ma di

di in r `mycount1' ", "  `mycount2'
*************


If you comment in the line

- local myvars2 `r(varlist)'-

and -consequently- comment out the line below it, you will get the correct
result "100" for -local- "mycount2". See NJC`s
http://www.stata-journal.com/article.html?article=pr0045 for explanations...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Trelle Sven
Gesendet: Donnerstag, 19. August 2010 15:27
An: statalist@hsphsun2.harvard.edu
Betreff: st: RE: Number of a subset of variables in local

Thanks to Martin and Antoine, that was quick. 
Both solutions work fine (Antoine's is two lines though). 
Thread closed. Sven

Two line solution:
 unab myvars : name*
 local mycount=wordcount("`myvars'")

Three line solution:
 d name*, varlist
 local myvars=r(varlist)
 local mycount: list sizeof myvars




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