[yt-users] clump to field?

[David Collins]

Is there an easy way to turn
  data._get_cut_mask(grid)
into an AMR region?

Then I could just do a boolean "or" on those regions from each of the
regions?

d.


On Fri, May 17, 2013 at 1:34 PM, Matthew Turk <matthewturk at gmail.com> wrote:

> On Fri, May 17, 2013 at 3:31 PM, david collins <dcollins4096 at gmail.com>
> wrote:
> > Hi, all--
> >
> > I have a clump that I've gotten with the clump finder.  I'd like to paint
> > those zones of that clump with a flag, so I can exclude that region from
> > other analysis.  I'm a little stuck on how to get this done-- I feel
> like it
> > needs to involve clump.data._flush_data_to_grids and a cut_mask, but I'm
> a
> > little stuck on how to define the field that I flush_to_grids.
> >
>
> I have to think about specifically how you might do this, but I do
> believe that you can probably accomplish what you're looking for by
> using a boolean region.
>
> > Specifically, how to get the cut_mask information to the field, and how
> to
> > avoid clobbering the paint from one clump with another (or, from one grid
> > with another)
> >
> > I'm trying to do something like:
> >
> > <code>
> > for grid in clump.data._grids:
> >     cut_mask = clump.data._get_cut_mask(grid)
> >     def masked_region(field,data):
> >         cut_mask = data.get_field_parameter('cut_mask', None)
> >         try:
> >             base = data['masked_region']
> >         except:
> >             base = na.zeros(data['Density'].shape)
> >         if cut_mask is not None:
> >             base = na.maximum(base,cut_mask)
> >         return base
> >
> >
> add_field('masked_region',function=masked_region,validators=[ValidateGridType()],
> > not_in_all=True)
> >     grid.set_field_parameter('cut_mask',cut_mask)
> >     print grid, cut_mask.sum(), grid['masked_region'].sum()
> > clump.data._flush_to_grids('masked_region',0)
> > </code>
> >
> > but clump['masked_region'].sum() only returns the flagged zones in the
> first
> > of the grids.
> >
> > I feel like this is something I've done before, but can't find any
> reference
> > to it in my email or old scripts.  Apologies if this has been answered
> > elsewhere, or it's obvious and I'm being thick.
> >
> > Thanks!
> > d.
> >
> >
> >
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> >
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