[yt-users] Unigrid datasets, covering grid

[Matthew Turk]

Hi Dave,

The covering grid does no interpolation.  The smoothed covering grid
will, but covering grids themselves operate on a filling basis -- for
instance, if you have a 32^3 root grid that you put into a 64^3
covering grid, all cells at the root grid level that have no child
cells will become 8 cells in the final output.

An easy means of verifying this would be to compare a manually-taken
slice through the covering grid to a slice through the entire
simulation domain; the images should be roughly identical, and any
errors should clearly stick out.  Note that the covering grid itself
currently operates via floating point math, but an integer-based
covering grid operator is being tested for inclusion.  (It is
currently only in the hg repositories on hg.enzotools.org and on
bitbucket.)

-Matt

On Wed, May 20, 2009 at 12:38 PM, david collins <antpuncher at gmail.com> wrote:
> Hi, Everyone--
>
> I have a unigrid run that I want to compare to another one, run on a
> different number of processors.  I'd like to extract them both to a
> single numpy array (for each run) so I can difference.  Does the
> covering grid do any interpolation if I want a single N^3 numpy array
> from an N^3 enzo dump on X processors?
>
> Thanks,
> d.
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