Re: st: QUestion using -fs- package

["Michael N. Mitchell" <Michael.Norman.Mitchell@gmail.com>]

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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