How do we know the density of one specific coordinate ？

Yun Wang

17 Aug '20

Hi Dylan,
After download snapshot files， I read the DM's density data using Python scripts that you provided.
I found that the density data is a one-dimensional array, and we all know that density should be depend
on spatial coordinates. So, how do we relate the density to the coordinate?

Hi Dylan,

After download snapshot files， I read the DM's density data using Python scripts that you provided.

I found that the density data is a one-dimensional array, and we all know that density should be depend

on spatial coordinates. So, how do we relate the density to the coordinate?

Hi Yun,

The snapshot values of

`Density`

provide the values at a set of (x,y,z) positions, given by`Coordinates`

.You can think the of the dataset as a "scattered point set" or "scattered data", as opposed to a "grid" or "gridded data", which it is not.

So, if I want to obtain information about the density field, I should load "Density" and "Coordinates" simultaneously.

Is this right?

If you want to analyze how the density field varies in space, then yes.

Thank you, I got it!