Hi Boyan,

Since the grids are uniform, you can do one of a few different things.
The first would be if you want to set up a derived field, you could do
something like:

ds1 = ...
ds2 = ...

@yt.derived_field(name = "my_field", validators = [yt.ValidateSpatial()])
def my_field(field, data):
    f1 = ds1.index.grids[data.id - data._id_offset][field.name]
    f2 = data[field.name]
    return f1 - f2

If you want to simply inspect, you can do
ds1.index.grids[whatever][field] - ds2.index.grids[whatever][field].

-Matt

On Mon, Jun 15, 2015 at 11:05 PM, bh11e <bh11e@my.fsu.edu> wrote:

Hi,

I was wondering if someone could advise on the following problem. Consider two (Enzo) datasets with identical grids. What is the way to plot the difference between a field in one set and a field in the other. Alternatively is there a way to create a new dataset with the calculated difference, after which plotting will be as usual.

Thanks,

--Boyan Hristov
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