[yt-users] Data Objects across simulation files

[Nathan Goldbaum]

As Matt indicated, this isn't yet possible in yt.

If you have an idea of how to implement this in practice, I think we'd be
more than happy to help out if you have questions. An interface to compare
datasets (i.e. a DifferencePlot, or something like that) is commonly
requested but no one has really put time in on yet.

I've done similar things in the past by extracting covering grids or
smoothed covering grids from a simulation. This samples all of the data at
a fixed resolution level, making cross-dataset comparisons much easier to
reason about.

-Nathan

On Tue, Oct 18, 2016 at 10:59 AM, Matthew Turk <matthewturk at gmail.com>
wrote:

> Hi Jason,
>
> Right now, this is best done via the time series ... but it's also one
> of my favorite feature requests.  It would be really fun to implement,
> I think.
>
> On Tue, Oct 18, 2016 at 10:55 AM, Jason Galyardt
> <jason.galyardt at gmail.com> wrote:
> > Dear yt-users,
> >
> > Does anyone know whether it's possible to define a data object using one
> > simulation file (an AMR grid simulation -- FLASH) and then apply that
> > physical selection region to another simulation file (representing a
> > different time in the same simulation)?
> >
> > For example, I'd like construct a cut_region data object using, say,
> > temperature and density to select a particular feature at time t_n; I
> would
> > then like to look at the gas in this same physical region at time t_m,
> where
> > t_m < t_n. I assume that this would require somehow converting a
> collection
> > of cells making up the cut_region from time t_n to a description of a
> > (complex) geometrical selection, then applying this geometrical
> selection to
> > the data file from time t_m. The caveat here is that the cells in the
> > selected region may have time-varying levels of refinement.
> >
> > This seems like a non-trivial feature to implement, so I thought I'd ask
> > whether it's already available.
> >
> > Cheers,
> > Jason
> >
> > ------
> > Jason Galyardt
> > University of Georgia
> >
> >
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> >
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