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Re: st: QUestion using -fs- package


From   "Michael N. Mitchell" <Michael.Norman.Mitchell@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: QUestion using -fs- package
Date   Tue, 08 Jun 2010 13:31:30 -0700

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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