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Re: st: Gen Randomized geo coordinates within a range


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Gen Randomized geo coordinates within a range
Date   Fri, 19 Aug 2011 11:36:47 +0200

On Fri, Aug 19, 2011 at 11:17 AM,  <graupel75@gmail.com> wrote:
> I need to generate a set of random geographic coordinates (x,y) given
> a central point, within a given range.

In the example below I assume that the range is a 2 unit by 2 unit
square around the central point and the distribution from which to
draw is a uniform distribution.

*-------------- begin example --------------
clear
input x y
1 1
5 5
1 5
end

forvalues i = 1/10 {
	gen xran`i' = 2*runiform() + x - 1
	gen yran`i' = 2*runiform() + y - 1
	local gr `"`gr' || scatter yran`i' xran`i'"'
}
scatter y x, aspect(1) `gr'
*-------------- end example -----------------
(For more on examples I sent to the Statalist see:
http://www.maartenbuis.nl/example_faq )

Hope this helps,
Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
--------------------------
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