[SciPy-user] neighbourhood of randomly scattered points
Wed Aug 29 18:26:26 CDT 2007
Robert Kern a écrit :
> White noise isn't all that uniform. It does clump, and some kinds of displays
> may show that off more than others. The orthogonal striations are a side effect
> of your square definition of "neighborhood" that you used to plot and not
> anything intrinsic to the data.
> If you do need something more spatially uniform than what real pseudorandomness
> gives you, then you should look at low-discrepancy sequences.
Sorry, I don't understand.
1) My algorithm to enumerate the number of neighbours in the
neighbourhood does work fine
and has been validated.
shows the result for a rectangular neighbourhood. That's ok,
there are striations, but this is not the problem.
shows the result for a circular neighbourhood. There is no more striations.
The question is : why I get (for the circular case) around 90 neighbours
at il = xl = 450 and around 40 at il = xl = 200, ie less than half, if
completely random ?
I was expecting something more "uniform":
the mean is about 70 and the std about 10.
More information about the SciPy-user