[yt-users] Cell Volume in regions

[Nathan Goldbaum]

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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