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


From   Antoine Terracol <Antoine.Terracol@univ-paris1.fr>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: RE: Number of a subset of variables in local
Date   Thu, 19 Aug 2010 16:02:41 +0200

OK, in fact, with lists larger than 37 names, both the following work:

local mycount1: list sizeof myvars
local mycount2: word count myvars

but

local mycount3=wordcount("`myvars'") will byte

--------------------------------------
clear*

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

unab myvars: name*
local mycount1: list sizeof myvars
local mycount2:word count(`"`myvars'"')
local mycount3=wordcount("`myvars'")
di `mycount1'
di "`mycount2'"
di "`mycount3'"
-----------------------------------------

Antoine

On 19/08/2010 15:54, Antoine Terracol wrote:
Right, had forgotten about that (though I've been beaten more than once...)

So I guess the correct 2-liner would be:

unab myvars : name*
local mycount: list sizeof myvars

Antoine



On 19/08/2010 15:45, Martin Weiss wrote:

<>

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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