[yt-users] subregion halo find

[Geoffrey So]

I was trying to see if I can analyze a big simulation by using it as a big
statistical sample, it was just a test of a backup plan B.

Plan A is of course analyze the big sim with many cores and lots of memory,
so hopefully plan A works.

From
G.S.

On Wed, Sep 21, 2011 at 3:04 PM, Stephen Skory <s at skory.us> wrote:

> Hi Geoffrey,
>
> > Hi Stephen, I'm trying to do halo finding in a subregion of the box, but
> do
> > the various halo finders know that the boundary conditions are no longer
> > periodic?  If periodic BC is on by default, is there a flag to switch off
> > periodicity during the subregion halo find?
>
> I think that this question is ill-posed in the sense that I'm not sure
> that anything good will happen if you try halo-finding in a region
> that touches one of the periodic box edges. The subregion halo finding
> is a kludge that is primarily meant for looking at stuff only where
> you're interested, say in the center of your nested-grid simulation,
> far away from the boundaries.
>
> To answer your specific question as best I can: No, there is nothing
> to turn off the periodic boundaries with subregion finding. But I
> think you shouldn't be doing subregion finding where the boundaries
> are a concern. I think Bad Things (tm) will happen.
>
> Let me know if that doesn't help!
>
> --
> Stephen Skory
> s at skory.us
> http://stephenskory.com/
> 510.621.3687 (google voice)
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