[yt-users] Cell Volume in regions

[Daniel]

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?

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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