[yt-users] Cutting region confusion

[Stephanie Tonnesen]

Hi John,

When I change the tracerp25 selections to all have <= or >= symbols, the
value basically doesn't change.  With the gt/lt and equal-to "Ones" is
definitely different:

tracerp25 is 1099285
tdp25 is 2028955

So the selection criteria is definitely more stringent on
tracerp25 = alld.cut_region(["grid['
specific_scalar[0]'] > 0.25","grid['z'] <= 0.1925","grid['z'] >=
-0.1925","grid['cyl_Rcode'] <= 1.2"])

-Stephanie



On Mon, Aug 4, 2014 at 2:11 PM, John ZuHone <jzuhone at gmail.com> wrote:

> Hi Stephanie,
>
> I suspect the problem is that these are not *exactly* the same regions.
> Have you tried checking the result of:
>
> tdp25["Ones"].sum()
>
> tracerp25["Ones"].sum()
>
> which would be a quick way to determine the number of cells in each region.
>
> What might be going on (but I have yet to verify) is that the disk
> selection container object is using >= and <= for the zone selection,
> whereas you used > and < in the definition of your cut region. You might
> try swapping those out and seeing if that changes things.
>
> Best,
>
> John Z
>
> On Aug 4, 2014, at 1:15 PM, Stephanie Tonnesen <stonnes at gmail.com> wrote:
>
> > Hi all,
> >
> > I am trying to get the total mass in a disk region of my simulation.  I
> am using athena data and yt 2.7-dev.  I thought I was defining the region
> in the same way using two methods:
> >
> > alld = pf.h.all_data()
> > tracerp25 = alld.cut_region(["grid['specific_scalar[0]'] >
> 0.25","grid['z'] < 0.1925","grid['z'] > -0.1925","grid['cyl_Rcode'] < 1.2"])
> >
> > disk = pf.h.disk([0.0,0.0,0.0],[0.0,0.0,1.0],1.2,0.385)
> > tdp25 = disk.cut_region(["grid['specific_scalar[0]'] > 0.25"])
> >
> > but when I print the total mass I get answers that differ by 10%
> >
> > print tracerp25.quantities["TotalQuantity"]("CellMassMsun")
> > print tdp25.quantities["TotalQuantity"]("CellMassMsun")
> >
> > >>[8019047231.5192223]
> > >>[8886968784.4710732]
> >
> > Can someone point out where my difference is?
> >
> > Thanks!
> >
> > Stephanie
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>
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