[yt-users] FRB extraction details

David Collins dcollins4096 at gmail.com
Mon Apr 20 11:19:52 PDT 2015 

Done and done.

Thanks!

d.

On Mon, Apr 20, 2015 at 2:05 PM, Nathan Goldbaum <nathan12343 at gmail.com>
wrote:

>
>
> On Mon, Apr 20, 2015 at 10:57 AM, David Collins <dcollins4096 at gmail.com>
> wrote:
>
>> Hi, Nathan and Everybody--
>>
>> I've tried several iterations of quantities with and without units and
>> keep getting errors.  Here are the things I've tried, perhaps there's
>> something dumb I'm doing.  I won't have any free space for deeper debugging
>> for a few weeks, but I can look for a fix then. Low priority, I can simply
>> flag out the zeros for now, but this is where I"m at right now:
>>
>> Thanks a ton!
>>
>> >>>  proj = ds.proj("density","z")
>> >>>  Delta = (0.1,'code_length')
>> >>>  dx = (1./512,'code_length')
>> >>> frb=proj.to_frb(Delta,dx)
>> works great!
>> >>> frb=proj.to_frb( [Delta, Delta],[dx,dx])
>> raceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "tmp.py", line 22, in <module>
>>     frb=proj.to_frb( [Delta, Delta],[dx,dx])
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/data_containers.py",
>> line 909, in to_frb
>>     width = self.ds.quan(w, input_units = u)
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/units/yt_array.py",
>> line 1153, in __new__
>>     raise RuntimeError("YTQuantity values must be numeric")
>> RuntimeError: YTQuantity values must be numeric
>>
>>
>> Also I tried using a ds.arr:
>> >>> Delta = ds.arr([0.1,0.1],'code_length')
>> >>> dx = ds.arr([1./512, 1./512], 'code_length')
>> >>> frb=proj.to_frb( Delta, dx)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>>   File "tmp.py", line 26, in <module>
>>     frb=proj.to_frb( Delta, dx)
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/data_objects/data_containers.py",
>> line 909, in to_frb
>>     width = self.ds.quan(w, input_units = u)
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/units/yt_array.py",
>> line 1155, in __new__
>>     dtype=dtype)
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/units/yt_array.py",
>> line 308, in __new__
>>     input_array.units = Unit(input_units, registry=registry)
>>   File
>> "/home/dcollins4096/local-yt-2014-08-27/src/yt-hg/yt/units/unit_object.py",
>> line 169, in __new__
>>     % (unit_expr, type(unit_expr)))
>> yt.units.unit_object.UnitParseError: Unit representation must be a string
>> or sympy Expr. 0.1 code_length has type <class
>> 'yt.units.yt_array.YTQuantity'>.
>>
>>
>>
> Any chance you can create issues for these examples so we don't drop them?
>
>
>>
>> On Mon, Apr 20, 2015 at 1:36 PM, Nathan Goldbaum <nathan12343 at gmail.com>
>> wrote:
>>
>>>
>>>
>>> On Mon, Apr 20, 2015 at 10:32 AM, David Collins <dcollins4096 at gmail.com>
>>> wrote:
>>>
>>>> Sorry, I should clarify--
>>>>
>>>> I tried doing
>>>> >>> frb=proj( (W1,W2), (dx1, dx2))
>>>> and it complained that the second value wasn't a string.  Is there a
>>>> way to tell the frb that the tuple isn't a (value, unit) pair?
>>>>
>>>>
>>> This should be accounted for internally.  If it's not doing that right
>>> now it's should be a straightforward fix.  Can you create a short example
>>> that's not working for you and file an issue about it, or if you're feeling
>>> ambitious, submit a PR with a fix?
>>>
>>> That said, I think a tuple like `((3, 'pc'), (2, 'pc'))` will work.
>>>
>>>
>>>> Thanks!
>>>> d.
>>>>
>>>> On Mon, Apr 20, 2015 at 1:31 PM, David Collins <dcollins4096 at gmail.com>
>>>> wrote:
>>>>
>>>>> Hi, Matt and Everybody--
>>>>>
>>>>> I have another dumb question.  If I want a non-square FRB, is that
>>>>> possible?
>>>>>
>>>>> d.
>>>>>
>>>>> On Mon, Apr 20, 2015 at 12:38 PM, David Collins <
>>>>> dcollins4096 at gmail.com> wrote:
>>>>>
>>>>>> Great.  Thanks, Matt!
>>>>>>
>>>>>> d.
>>>>>>
>>>>>> On Mon, Apr 20, 2015 at 11:44 AM, Matthew Turk <matthewturk at gmail.com
>>>>>> > wrote:
>>>>>>
>>>>>>> Hi Dave,
>>>>>>>
>>>>>>> That's how it works by default, except at the boundaries of pixels
>>>>>>> that don't line up with cell boundaries, where it computes partial
>>>>>>> contributions. That can be turned off by setting antialias to false.
>>>>>>>
>>>>>>> Matt
>>>>>>>
>>>>>>> On Mon, Apr 20, 2015, 10:42 AM David Collins <dcollins4096 at gmail.com>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi, Everybody!
>>>>>>>>
>>>>>>>> If I make an FRB and have the resolution that of the finest zones,
>>>>>>>> how doe the coarser zones get filled?  Is it possible for them to be forced
>>>>>>>> to be piecewise-constant sampling of the coarse data?
>>>>>>>>
>>>>>>>> d.
>>>>>>>>
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>>>>>
>>>>>
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