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Re: st: RE: findname any of


From   Jakob Petersen <jpeterb@essex.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: findname any of
Date   Mon, 03 Oct 2011 14:23:05 +0100

Thanks to Jesper and Nick

A two-step solution could be:

* A *************************************
sysuse auto,clear
cap n findname make, type(string)
local varlist `r(varlist)'
di "`varlist'"
isvar guitar make
local varlist `r(varlist)'
di "`varlist'"
cap n findname `varlist', type(string)
local varlist `r(varlist)'
di "`varlist'"
**************************************

Jakob

On 03/10/2011 14:12, Nick Cox wrote:
Please note that -findname- had a bug fixed in 10.4:

SJ-10-4 dm0048_1  . . . . . . . . . . . . . . . . Software update for findname
         (help findname if installed)  . . . . . . . . . . . . . . .  N. J. Cox
         Q4/10   SJ 10(4):691
         update for not option

SJ-10-2 dm0048  . . . . . . . . . . . . . .  Speaking Stata: Finding variables
         (help findname if installed)  . . . . . . . . . . . . . . .  N. J. Cox
         Q2/10   SJ 10(2):281--296
         produces a list of variable names showing which variables
         have specific properties, such as being of string type, or
         having value labels attached, or having a date format

In respect to this example:

sysuse auto
cap n findname guitar make
local varlist `r(varlist)'
su `varlist'

-findname- does not return a varlist in this case, so r(varlist), therefore `varlist', is empty and Stata sees -su-, and reacts accordingly.  Your interpretation of this example is thus incorrect. Nor is -ds- different in this respect.

More crucially, what I think you want is that -findname- ignores non-variable names, at least under an option. I can see that you might want that, but I am wary of complicating a command that already seems to be too complicated to have caught on much.

Check out -isvar- at SSC.


Nick
n.j.cox@durham.ac.uk

Jakob Petersen

I would like to create macro lists of variables based on various
conditions (Stata 11.2).

The question: Is it possible to specify -findname- to "any of" instead
of "all of"?

If a variable is not found the `r(varlist)' seems to end up listing all
variable
names (same for -ds-):

*1 *************************************
sysuse auto,clear
cap n findname make
local varlist `r(varlist)'
su `varlist'
cap n findname guitar make
local varlist `r(varlist)'
su `varlist'
**************************************


I guess !_rc {} could be used to fix this:

*2 *************************************
sysuse auto,clear
cap n findname make
if !_rc {
local varlist `r(varlist)'
su `varlist'
}
cap n findname guitar make
if !_rc {
local varlist `r(varlist)'
su `varlist'
}
**************************************

-lookfor- could be an ("any of") alternative, but is much more limited
in terms of options compared to -findname-

* 3 *************************************
sysuse auto,clear
cap n lookfor make
if !_rc {
local varlist `r(varlist)'
su `varlist'
}
cap n lookfor guitar make
if !_rc {
local varlist `r(varlist)'
su `varlist'
}
**************************************


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--
Kind regards,
Jakob


/*
Jakob Petersen
Institute for Social and Economic Research (ISER)
University of Essex, Colchester, Essex CO4 3SQ, UK
T: +44 (01206) 873683
E: jpeterb@essex.ac.uk
www.iser.essex.ac.uk
*/

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