[yt-users] strange particle field behavior

[Matthew Turk]

On Fri, May 10, 2013 at 4:44 PM, Britton Smith <brittonsmith at gmail.com> wrote:
> Hi all,
>
> I am seeing something odd with a field called "IsStarParticle".  This is an
> Enzo field defined in the following way:
>
> def _IsStarParticle(field, data):
>     is_star = (data['creation_time'] > 0).astype('float64')
>     return is_star
>
> When I do the following:
> print pf.h.grids[0]['IsStarParticle']
>
> I get the expected field of 1s and 0s.
>
> When I do this:
> all_data = pf.h.all_data()
> print all_data['IsStarParticle']
>
> I get the values that correspond to the creation_time field.  It does not
> matter in what order I do this.  Whenever I try to access the field from a
> geometric object, I get the actual creation time and not the field I expect.
> Whenever I access it from a grid object, I get the right thing.
>
> Does anyone know what's going on here?

No, not really.  But there is one thing that I should note, which is
that it may be getting caused by using "IsStarParticle" as a boolean
index.  Which would not work correctly, and would just return the 0th
and 1st values of whatever array it's being used as an index into.  I
think.

-Matt

>
> Britton
>
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