Britton,
What about the halos themselves? How do they compare to each other?
Can you perform a simple N^2 check on the halos for closest neighbor
in the other method, compare the masses and radii, and see if this is
in fact a halo finding problem?
What about plotting them? Do you see visually similar results?
-Matt
On Thu, Oct 15, 2009 at 9:43 AM, Britton Smith
Stephen,
It looks like if I take any random particle in a halo made with yt FOF, it's in a completely different halo in inline FOF, or not in any halo at all. Michele is checking this out right now, but it basically looks like the particle lists for the same halo found with the two different methods are completely different.
Britton
On Thu, Oct 15, 2009 at 10:22 AM, Stephen Skory
wrote: Britton,
I'll check the yt FOF IDs against Enzo right now. The halo output of the code seems just fine, so if there's a bug, it's minor. I'll let you know what I find.
I remembered that the kD tree yt FOF uses is a bit inaccurate, and that could be a source of difference between the two sets of FOF haloes. But you said the differences were huge, and the kD inaccuracy should give only small differences, especially in FOF. Just a thought.
_______________________________________________________ sskory@physics.ucsd.edu o__ Stephen Skory http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student ________________________________(_)_\(_)_______________
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