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RE: st: STATA loop terminating over missing variables


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: STATA loop terminating over missing variables
Date   Mon, 1 Dec 2008 14:15:07 -0000

The original question seems backwards. The purpose of the loop as
written is to create (e.g.) mindiff1_2 from mindiff1 and mindiff_2, so
that far from being a problem, the prior non-existence of mindiff1_2 is
expected. Perhaps the questioner meant that some of the
mindiff1-mindiff15 may not exist, in which case a better syntax is (as
indicated by Maarten) 

forval i = 1/15 { 
	forval j = 1/15 { 
		capture gen mindiff`i'_`j' = mindiff`i' - mindiff`j' 
	} 
} 
 
Note correction of typo ``i' to `i'. 

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

Maarten buis

--- Akshay SHanker <ashanker@optusnet.com.au> wrote:
> I am running the following simple loop which i need some help with:
> 
> forvalues i =1/15 {
> forvalues j=1/15{
> gen mindiff`i'_`j' = mindiff``i' - mindiff`j' 
> }
> }
> 
> The problem is that not all combinations of i and j exist , so for
> example mindiff1_2 may not exist. Everytime the loop goes over such a
> variable, the loop terminates and thus stops running the loop over
> all consecutive variables which may exist. How do i stop the loop
> from terminating? 

see: -help capture-


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