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st: RE: RE: Deleting Characters of a Var Name by index Number


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Deleting Characters of a Var Name by index Number
Date   Thu, 1 May 2008 21:10:46 +0100

No. Belay that. I don't understand your example and your rule now that I
look at it again. 

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox
Sent: 01 May 2008 21:00
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: Deleting Characters of a Var Name by index Number

What you want may be called a macro in other languages, but it is not in
Stata. 
There is no need to write any new command, program or do file. 

foreach var of var <whatever> { 
	local newvar = substr("`var'", 1, length("`var'")-2) +
substr("`var'", -1, 1) 
	rename `var' `newvar' 
}

Alternatively, check out -renvars- (-search- for locations). Use the
-map()- option. 

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

Kyle Caswell

I would like to write a macro that renames variables by deleting a
specific 
character of a variable name for a group of variables.

For example, suppose that I have variables X31 X42 X53 and so on.   I
would 
like to wite a macro that does something like the following:

foreach var of varlist X31 X42 X53{
    rename `var' = [X and only the second to last character from the
*left* 
of `var']
}

That is, X31 would then be renamed X1 and X42 would be X5 and so on.


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