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st: RE: Re: Stata Journal and piece of string variables


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Re: Stata Journal and piece of string variables
Date   Sat, 20 Nov 2004 18:03:37 -0000

Scott Merryman suggested 

drop if substr(automob, -3 ,3) == "car"

and Michael Blasnik suggested 
 
drop if match(automob,"*car")

Yet another approach is 

drop if index(automob,"car") == (length(var1) - 2)

which is less direct than the other two. However, 
in general, with string tasks, there are commonly 
different ways to do it, and the basic string 
functions documented at -whelp strfun- usually suffice. 

(I found that -help string- pointed me directly 
to -strfun-.) 

TEWODAJ MOGUES

> > Another question (I don't find lots of info on the search regarding
> > string variables): Is there a way for me to refer to a 
> piece of string
> > var? Say there is a string var called -automob- with values 
> redcar and
> > bluecar. Suppose I want to do something like
> > drop if automob == " * car"
> > thus gettingn rid of rows where the values are redcar or bluecar
> > CLearly this syntax doesn't work, but is there a way to do 
> something in
> > this spirit without too complicated splitting-up of variables?

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