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st: RE: numlist maximum capacity


From   "Nick Winter" <nwinter@policystudies.com>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: numlist maximum capacity
Date   Tue, 8 Apr 2003 13:32:04 -0400

> -----Original Message-----
> From: Euler P. G. de Mello [mailto:euler@cedeplar.ufmg.br] 
> Sent: Tuesday, April 08, 2003 1:38 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: numlist maximum capacity
> 
> 
> Dear Statalisters,
> I am trying to loop over 1870 cases using the -foreach- 
> function, e.g.:
> 
> . foreach n of numlist 1/1870{ display(`n')}
> invalid numlist has too many elements
> r(123);
> 
> Does anybody know what's the maximum number of elements of a 
> -numlist-?
> Thanks beforehand for the attention,
> Euler P.G de Mello
> [stata 7.0, win 98]
> 
> Ps.:
> I have already managed to circunvene this situation by using 
> something like:
> 
> local step=0
> foreach n of numlist 1/2 {
>         foreach m of numlist 1/5 {
>                 display(5*`step'+`m')
>                 }
>         local step=`step'+1
>   
> }
> 

For the limits, type

	. help limits

As it happens, the limit for numlists is 1600 elements.  Whether or not
you are over that limit, it would be more efficient to code:

	forvalues n=1/1870 {
		<<do something>>>
	}

If you need a numlist that does not increment by one, then you could do
something like:

	local n 0
	while `n'<10000 {
		<<do something>>
		local n=`n'+2
	}

This would give you the numbers 0 through 10000 in steps of two, or the
equivalent of 0(2)10000.

Nick Winter

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