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st: substring of a variable name


From   Martin Rio <axolx@fastmail.fm>
To   statalist@hsphsun2.harvard.edu
Subject   st: substring of a variable name
Date   Thu, 30 Jun 2005 16:53:07 -0500

I have a dataset with several variables named:
datax1 datax2 datay1 datapt datafj

and I'd like to remove the 4 first characters of each to get variables
with names:
x1 x2 y1 pt fj

I tried:

foreach var of varlist data* {
 	local newname substr(`var', 4, length(`var')-2)
 	rename `var' `newname'
}

It seems that the standard string functions may not apply to macros. Any
ideas on how to do this? Are there string functions specific to macros? I
was looking at the documentation for macro extended functions but did not
find something that would seem to do it.

thanks in advance,
martin

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