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Re: st: Appending several files


From   kantor.d@att.net
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Appending several files
Date   Mon, 16 Oct 2006 02:18:26 +0000

Ulrich Kohler already supplied an interesting solution.  I'd like to show how I usually handle this sort of situation (which does come up often -- with either -append- or -merge-). This might be more of an old-fashioned programmer's method.

local j "0"
foreach f in `r(files)' { 
 if `j' == 0 {
  use `f'
 }
 else {
  append using `f' 
 }
local ++j
}

One can be more clever by putting the ++j (or j++) inside the -if- statement, if you prefer.
I haven't yet tried that technique; it might go 
if `j++' ==0
(if I have the syntax right -- or is it `=j++' ... ?) or even
if ~`j++'

I hope this is may be useful.
--David
-------------- Original message from "Nuno Soares" <ns.mlists@gmail.com>: -------------- 


> Hi everyone, 
> 
> I'm trying to make Stata to append several files that are in a given 
> directory without the need of specifying the name of each one. I was 
> thinking of doing something like this (using the fs package): 
> 
> clear 
> cd "C:\data" 
> qui fs * 
> foreach f in `r(files)' { 
> append using `f' 
> } 
> 
> The problem with this code is that Stata doesn't allow to append a data file 
> when it doesn't have a file opened (it will return the error message: 
> "no dataset in use 
> r(3)") 
> 
> This means that I must have at least one of the files loaded in Stata before 
> using the above code. But if I then use the above code, I would end up 
> getting duplicate observations, because the file I've first used is also 
> appended... Any ideas of how to solve this issue? 
> 
> Best, 
> 
> Nuno 
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