[yt-users] Cell Volume in regions

[Matthew Turk]

Hi Daniel,

On Wed, Jul 9, 2014 at 10:57 AM, Daniel <cunnama at gmail.com> wrote:
> Hi Nathan,
>
> Thanks for getting back to me.
>
> That is odd, because then if my region includes all the particles I have
> equal elements in cell_volume and all the other gas quantities?
>

Yup, that is a bit odd.  How are you loading the data?  Are you
specifying either n_ref or over_refine_factor when doing so?

-Matt

> Kind Regards,
> Daniel
>
>
> On 9 July 2014 15:06, Nathan Goldbaum <nathan12343 at gmail.com> wrote:
>>
>> Hi Daniel,
>>
>> The cell_volume field is an alias for ('gas, 'cell_volume'), which for
>> Gadget data corresponds to the volume of octree cells. In general there will
>> be fewer octree cells than particles.  I'm a little surprised the numbers
>> are so close since the default option is to refine octree cells when more
>> than 64 particles are in a cell, although the precise structure of the
>> octree will depend on the particle distribution.
>>
>> Nathan
>>
>>
>> On Wednesday, July 9, 2014, Daniel <cunnama at gmail.com> wrote:
>>>
>>> Hi there,
>>>
>>> I am extracting a region from a Gadget dataset using the sphere function
>>> and then attempting to access the "cell_volume" field.
>>>
>>> For some reason the number of elements in the cell volume field is not
>>> equal to the number of particles in the region.
>>>
>>> For example I have 4341760 particles but only 4228930 cell volume
>>> elements.
>>>
>>> I have extracted a sphere which encompassed all the particles and the
>>> number of cell volume elements is then equal.
>>>
>>> Any ideas or advice would be greatly appreciated.
>>>
>>> Kind Regards,
>>> Daniel
>>
>>
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