[yt-users] Cutting region confusion

[Stephanie Tonnesen]

I haven't done the projection, but changed the disk definition to

disk = pf.h.disk([0.0,0.0,0.0][0.0,0.0,1.0],1.2,0.1925)

(more or less what Nathan suggested) and end up with basically the same
values for the "Ones" count.

I thought that in the disk definition the z input was the total height of
the cylinder?

-Stephanie


On Mon, Aug 4, 2014 at 2:36 PM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

> So tracep25 includes about half of the cells that tdp25 does.
>
> What if you do this instead:
>
> tracerp25 = alld.cut_region(["grid['specific_scalar[0]'] >
> 0.25","grid['z'] < 0.385","grid['z'] > -0.385","grid['cyl_Rcode'] < 1.2"])
>
>
> On Mon, Aug 4, 2014 at 11:34 AM, Stephanie Tonnesen <stonnes at gmail.com>
> wrote:
>
>> 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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