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RE: st: QUestion using -fs- package


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: QUestion using -fs- package
Date   Tue, 8 Jun 2010 22:45:35 +0200

<>

"2) You (or someone else) might be interested in putting a -note- in the
data file 
(rather than a variable). If you wanted to do that, you could change the
-gen- command to be

   note : This comes from the `f' data file"





The -note- is fine, but you could at any point in time replicate it via

***********
sysuse auto, clear
qui _getfilename "`c(filename)'"
di in r r(filename)
***********


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Michael N.
Mitchell
Sent: Dienstag, 8. Juni 2010 22:32
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: QUestion using -fs- package

Dear Nuno

   I think you are 99% of the way there. I think the problem is that the
variable -file- 
needs to be a string variable, thus you might try this....

qui fs *.dta
foreach f in `r(files)' {
	use `f', clear
	cap drop file
	gen str50 file="`f'"
  	save, replace
}

   Two other thoughts...

   1) the -save , replace- is a pretty scary command. If you make a bad
mistake you could 
destroy the original file. So, when doing something experimental like this,
it is prudent 
to have a solid backup of all the data files.

   2) You (or someone else) might be interested in putting a -note- in the
data file 
(rather than a variable). If you wanted to do that, you could change the
-gen- command to be

   note : This comes from the `f' data file

I hope that helps,

Michael N. Mitchell
Data Management Using Stata      - http://www.stata.com/bookstore/dmus.html
A Visual Guide to Stata Graphics - http://www.stata.com/bookstore/vgsg.html
Stata tidbit of the week         - http://www.MichaelNormanMitchell.com



On 2010-06-08 1.11 PM, Nuno Soares wrote:
> Hi everyone,
>
> I'm using the -fs- command to look into a directory for several files,
open
> them, insert a new variable with the file name, and save them. The code is
> the following:
>
> qui fs *.dta
> foreach f in `r(files)' {
> 	use `f', clear
> 	cap drop file
> 	gen file=`f'		
> 	save, replace
> }
>
> However, when I run the code I get the following error code:
> wscopear:  operator invalid
> r(198);
>
> Basically the gen file=`f' command is returning the above error. Any way
of
> doing what it is intended to do?
>
> All the best,
>
> Nuno
>
>
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