[yt-users] cut region vs. projection?

[Britton Smith]

Hi Dave,

One last followup here.  You should be able to also create your cut region
as you described in your original post, and then use the "source" keyword
in the projection call.
proj = pf.h.proj(0,"Density",source=cut_region)

This way is more versatile, since you can do profiling and derived
quantities (and eventually rendering) for cut regions, whereas the
field_cuts method only applies to projections.  Because of this, field_cuts
will probably be phased out at some point.

Britton


On Tue, Apr 23, 2013 at 11:13 AM, David Collins
<dcollins at physics.ucsd.edu>wrote:

> Perfect, thanks, Britton!
>
> d.
>
>
> On Mon, Apr 22, 2013 at 6:20 PM, Britton Smith <brittonsmith at gmail.com>wrote:
>
>> Hi Dave,
>>
>> You can use the field_cuts keyword for just such a thing.  You can supply
>> multiple strings to be eval'ed in a list.  For example,
>>
>> proj = pf.h.proj(0, 'Density', field_cuts=['grid["Density"] > 0.1',
>> 'grid["Density"] < 0.2'])
>>
>> Of course, you could also use one long string connected with ands.  This
>> may not be documented, but certainly should be.
>>
>> Britton
>>
>>
>> On Mon, Apr 22, 2013 at 6:00 PM, David Collins <dcollins4096 at gmail.com>wrote:
>>
>>> Hi, all--
>>>
>>> Can I hand a cut_region to a projection?
>>>
>>> I want to make a bunch of projections based on parameters, and don't
>>> want to have to instantiate 47 different fields.  I'm hoping something like
>>>
>>> region = pf.h.all_data().cut_region('grid["Density"] > 0.1 and
>>> grid["Density"] < 0.2')
>>> proj = pf.h.proj(0,"Density",region=cut_region)
>>>
>>> or something like that.  Is that possible?  I'm poking around the help
>>> and source, but no method immediately popped out at me.
>>>
>>> Thanks,
>>> d.
>>>
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>>>
>>>
>>
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>
>
> --
> Sent from my computer.
>
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