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Re: selecting radnom number from 2D array [message #75412 is a reply to message #75410]

Thu, 10 March 2011 07:46

pgrigis
Messages: 436
Registered: September 2007

Senior Member

On Mar 9, 7:36 pm, Ashok <ashokrija...@gmail.com> wrote:
> I have 3 sets of two dimensional array. I need to select random 100
> points from each array (same random point i.e. latitude and
> longitude). How can I do that using RANDOMU()? is there any other idea
> to do this?

Please do be careful and recognize that a random point
on a sphere will not have a uniform distribution of latitudes,
and a set of point with a uniform distribution of latitudes
will not be uniform on a sphere.

For instance to obtain the following uniform distributions

www.grigis.ch/spherepoints.png

I had to account for that.

Ciao,
Paolo

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[Message index]

		Re: selecting radnom number from 2D array By: David Fanning on Thu, 10 March 2011 08:08
		Re: selecting radnom number from 2D array By: David Fanning on Thu, 10 March 2011 08:03
		Re: selecting radnom number from 2D array By: pgrigis on Thu, 10 March 2011 07:46
		Re: selecting radnom number from 2D array By: Gray on Wed, 09 March 2011 17:09
		Re: selecting radnom number from 2D array By: Ashok on Thu, 10 March 2011 14:57

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