st: Re: How can I check that a variable exists?

["Martin Weiss" <martin.weiss1@gmx.de>]

<>

******
sysuse auto, clear

capture confirm variable weight
if !_rc {
                       di in red "weight exists"
               }
               else {
                       di in red "weight does not exist"
               }


drop weight

capture confirm weight
if !_rc {
                       di in red "weight exists"
               }
               else {
                       di in red "weight does not exist"
               }
******

HTH
Martin
_______________________
----- Original Message ----- 
From: "Benjamin Villena Roldan" <bvillena@troi.cc.rochester.edu>
To: <statalist@hsphsun2.harvard.edu>
Sent: Thursday, March 12, 2009 11:16 PM
Subject: st: How can I check that a variable exists?


> Dear statalist,
> This may sound like a trivial question, but I unsuccessfully looked for an
> answer so far.
>  I need to perform certain action A if there is a variable XA defined in
> the dta file, and an action B if there is a variable XB in the dta file. 
> How
> can I do so? Any ideas?
>
> Thanks
>
> Benjamin
>
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/