[yt-users] Profiles, root grid

[Matthew Turk]

Hi Dave,

On Tue, May 10, 2011 at 10:39 AM, David Collins
<dcollins at physics.ucsd.edu> wrote:
>> The covering grid is a bit special, in that it is not *quite* a data
>> container.  It can't be evaluated lazily, as you have seen.  This is
>> because it's designed to actually fill in a grid, which it then
>> returns to you -- sometimes with cells from the grids it contains
>> being included multiple times, as necessary.  I'm not sure we can get
>> around this, but I think that the grid collection might work?  Any
>> ideas?
>>
>
> Aha, that makes sense.  It works with HardWorking reader just fine, so
> maybe an error could be raised if lazy_reader is used with that kind
> of object.

I'll give a go at implementing that.

As a brief aside, I kind of regret calling it 'lazy_reader' now.  Back
when that got put in -- something like four years ago? -- it was to
distinguish from loading all the data at once and manipulating it in
memory.  I think the 'lazy' came from the idea of load-on-demand.
Nowadays it's just an unfortunate artifact that has a fun side effect
of being slightly confusing.  :(

-Matt

>
> d.
>
>
>
>
>
>> Best,
>>
>> Matt
>>
>>>
>>> Thanks!
>>> d.
>>>
>>>>
>>>> -Matt
>>>>
>>>> On Mon, May 9, 2011 at 10:24 AM, David Collins
>>>> <dcollins at physics.ucsd.edu> wrote:
>>>>> Hey, Matt--
>>>>>
>>>>> I found that if I do "lazy_reader = False" the covering grid works
>>>>> fine.  It looks like somewhere the field string in one of the
>>>>> __getitem__  calls is being treated like a list.
>>>>>
>>>>> I'm interested in using this with some derivative quantities, can I
>>>>> just send 'DivV' to the grid collection in your example, or will I
>>>>> have to let it know that it should grab ghost zones?
>>>>>
>>>>> d.
>>>>>
>>>>> On Mon, May 9, 2011 at 10:57 AM, Matthew Turk <matthewturk at gmail.com> wrote:
>>>>>> Hi David,
>>>>>>
>>>>>> Try a grid_collection:
>>>>>>
>>>>>> gc = pf.h.grid_collection([0.5,0.5,0.5], [pf.h.grids[0]])
>>>>>>
>>>>>> Note that it still requires a 'center'.  Also, this object is not
>>>>>> supposed to do any child masking, so if you find that it does, let me
>>>>>> know.
>>>>>>
>>>>>> -Matt
>>>>>>
>>>>>> On Mon, May 9, 2011 at 9:43 AM, david collins <antpuncher at gmail.com> wrote:
>>>>>>> Hi there--
>>>>>>>
>>>>>>> I'd like to add a profile object using only the root grid.  I
>>>>>>> typically do something like this:
>>>>>>>
>>>>>>> pc.add_profile_object(region,fields, weight=weight)
>>>>>>>
>>>>>>> Is there a way to restrict this to only root grid tiles?  I've tried
>>>>>>> using a covering grid, but that's throwing some key error (that I'm
>>>>>>> looking into presently, I'll have more info if/as I sort it out)
>>>>>>>
>>>>>>> Thanks,
>>>>>>> d.
>>>>>>>
>>>>>>> --
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>>>>>
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