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RE: st: foreach program


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: foreach program
Date   Fri, 8 Sep 2006 16:49:18 +0100

Quite so. There would be little point in -forval- 
if it were not more efficient as -foreach- 
is more general and could loop over anything -forval-
loops over. 

The key difference is that  -foreach- must store 
what it loops over, which could be thousands of things, 
while -forval- can calculate the loop index on the fly. 

Nick 
n.j.cox@durham.ac.uk 

Scott Cunningham
 
> This appears to be working.  I'm going to have to really dig into  
> this to figure out why mine did not work, though.  I admit, I don't  
> understand when to use -forval- and -foreach-.  They seem  
> interchangeable, but you identified an efficiency gain for using - 
> forval- here that I need to better understand.  I can study the  
> manuals, though.

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