[Date Index]
[Thread Index]
[Author Index]
Re: Random spherical troubles
*To*: mathgroup at smc.vnet.net
*Subject*: [mg25230] Re: [mg25170] Random spherical troubles
*From*: Geoffrey Steeves <gsteeves at gpu.srv.ualberta.ca>
*Date*: Fri, 15 Sep 2000 02:22:00 -0400 (EDT)
*Organization*: University of Alberta
*References*: <8pmmhc$r6a@smc.vnet.net>
*Sender*: owner-wri-mathgroup at wolfram.com
I just happened upon this post, but I think I have a similar question.
In studying whether a sequence of numbers is random, one can construct
what is called a Noise
Sphere(http://mathworld.wolfram.com/NoiseSphere.html). When I tried this
out, I got a non-uniform distibution of points concentrated along
the verticle axis (phi ~= 0) of the sphere. Initially I thought that this
was an artifact of my pseudo-random number generator, but I later tried
this out with "real" random numbers and got the same distribution.
Looking at the mapping(as it is shown on the web page):
theta = 2 * Pi * Random[]
phi = Pi * Random[]
r = Sqrt[Random[]]
I thought that the problem was with the distribution in phi. Is this a
mistake in the map? Or am I misunderstanding the what a Noise spehere is
supposed to be? Thanks for the help!
--
_______________________________________________________________________________
Geoff Steeves // University of Alberta Physics //
http://www.ualberta.ca/~gsteeves
-------------------------------------------------------------------------------
Prev by Date:
**RowReduce of badly conditioned matrix**
Next by Date:
**Re: Mapping down two lists**
Previous by thread:
**Re: Random spherical troubles**
Next by thread:
**Re: Re: Random spherical troubles**
| |