[yt-users] Subtracting datasets

[Jonah Miller]

Hi Matt,

I see. Thanks.

Best,
Jonah

On 15-06-16 09:53 AM, Matthew Turk wrote:
> Hi Jonah,
>
> If they're not identical in shape, you'd have to do some type of
> regularization stpe, which wouldn't be automated yet.  But this is
> something I hope to make automated, although it's not on the current
> schedule.
>
> -Matt
>
> On Tue, Jun 16, 2015 at 8:41 AM, Jonah Miller
> <jonah.maxwell.miller at gmail.com> wrote:
>> Hi Matt, Boyan,
>>
>> Although I'm not currently struggling with this, I will eventually encounter
>> a similar situation... What would one do if the grid was not uniform? Would
>> a derived field still work if the grids were identical?
>>
>> Best,
>> Jonah
>>
>>
>> On 15-06-16 09:34 AM, Matthew Turk wrote:
>>
>> 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 at 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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