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


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: How can I check that a variable exists?
Date   Thu, 12 Mar 2009 23:22:32 +0100

<>

******
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


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