[yt-users] selecting data by refinement level

[Matthew Turk]

Hi Klaus,

There are two ways to do this. The first is to create a collection of grids
(ds.grid_collection) from grids at the refinement level you're interested
in. But, I think this will include all points (including overlapping) which
will give undesirable results if you just want a Max refinement or Min
refinement.

The other way would be to make a data objects as per usual, for instance
with ds.all_data(), and before accessing any fields, set the attributes
min_level and max_level on that object. That should restrict the selection,
and will correctly remove overlapping points (up to max_level) if the two
values are different.

Let us know if that helps!

Matt

On Jun 6, 2017 6:37 PM, "Klaus Weide" <klaus at flash.uchicago.edu> wrote:

> Hi all,
>
> I have recently started using yt to for processing some FLASH results.
>
> Here is something that I think should be easy, but I haven't found an
> obvious and simple way in the documentation. I would like to analyze only
> cells (blocks) that are at a specific refinement level (let's say the
> highest) and discard all other cells (blocks). Is there an interface
> for defining a region by refinement level(s), immediately after loading an
> AMR file?
>
> I know I have access to cell properties like 'dx', 'dy' and could select
> cells based on that, but hopefully there is a more direct (and perhaps
> more efficient) way.
>
> Klaus
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