st: Re: sorting data puzzles

[Kit Baum <baum@bc.edu>]

No doubt one very important factor is that -sort- is built-in  
(compiled C) code, whereas -gsort- is ado-file code that repeatedly  
calls -sort-. ado-file code is always going to be slower, and a look  
at -gsort.ado- shows a number of calls to replace, compress, generate  
under by-control, etc.

Kit

Kit Baum, Boston College Economics and DIW Berlin
http://ideas.repec.org/e/pba1.html
An Introduction to Modern Econometrics Using Stata:
http://www.stata-press.com/books/imeus.html


On Jan 26, 2008, at 2:33 AM, Sergiy wrote:


> What exactly causes the difference in ascending/descending sorting  
> performance?
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