[Yt-dev] L7 HOP center_of_mass problem

Britton Smith brittonsmith at gmail.com
Mon Apr 27 10:09:35 PDT 2009


Are these negative numbers for halos that are sitting on domain boundaries
or are they completely nonsensical?  If it's the former, then maybe
something subtle has changed with how the code deals with periodic
boundaries.  Just a thought.

Britton

On Mon, Apr 27, 2009 at 10:57 AM, Matthew Turk <matthewturk at gmail.com>wrote:

> Hi Stephen,
>
> > With the new setup, I'm getting negative values for the center_of_mass()
> for some of the haloes in L7 running parallel HOP. It's a small fraction of
> the total. I am not getting this effect on smaller datasets for this reason.
>
> Which new setup?  With the patch including hop_numpy.h applied?  And,
> can you tell us what these negative values look like?
>
> > Matt, can you think of anything you changed when you did the HaloFinding
> switchover that would affect this?
>
> Not that I can think of.  I got the same results on the small
> datasets; hop should be called in the same way.  Can you show us one
> or two of the lines where you get the negative values?
>
> -Matt
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