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Re: st: Re: Appending several files


From   Jeph Herrin <junk@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Re: Appending several files
Date   Mon, 16 Oct 2006 14:04:52 -0400

Good trick, I will use this. I recently advocated the addition
of an [empty] option to -append-, which would force -append- to
act like -use- if there were no dataset in memory. However, those
who don't often -append- didn't see the hardship in trapping the
first file.

cheers,
Jeph


Jens Lauritsen wrote:
A simple technique can be useful to "trick" Stata to behave like a dataset exists:
* create an empty dataset with one observation and one variable:
set obs 1
gen articifialvar = 1

* now you can do anything where Stata expects an open data set to be present, e.g. from
* the current discussion:
qui fs *
foreach f in `r(files)' {
append using `f'
}

* following appending all the files the first imaginary observation and variable can be dropped:
drop artificialvar
drop in 1

regards
Jens Lauritsen
Odense, Denmark

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