[yt-users] getting the average density inside a data container

[Britton Smith]

Hi Kearn,

Have a look at this section in the documentation:
http://yt-project.org/docs/2.6/analyzing/objects.html#processing-objects-derived-quantities

That should tell you what you need to know.

Britton


On Sat, Nov 30, 2013 at 11:49 AM, <k.grisdale at surrey.ac.uk> wrote:

>  Hi Britton,
>
>  Thanks for the reply. Your advice with the region command helped and I
> now have that working.
>
>  I have tried to implement the commands you suggest to find the average
> density in side my object, but I don’t really understand how to apply them.
> Could you elaborate on them?
>
>  Thanks
>
>  Kearn
>
>  On 30 Nov 2013, at 09:23, Britton Smith <brittonsmith at gmail.com> wrote:
>
>  Hi Kearn,
>
>  I believe the issue with the region is that the arguments are center,
> left corner, right corner.  Each of those needs to be a triple.
>
>  On the other issue, is AveragedDensity a field you created?  If not, I
> don't believe it exists.  If you want to take the average inside some
> object, you should do something like:
> object.quantities["WeightedAverageQuantity"](field, weight_field)
>
>  Britton
>
>
> On Sat, Nov 30, 2013 at 7:12 AM, <k.grisdale at surrey.ac.uk> wrote:
>
>> Hi yt Users
>>
>>  I am trying to create a data container that is a cube from which I can
>> extract the average density of the gas inside the cube. I am using Ramses
>> data.
>>
>>  When I create a data container using:
>>
>>  p6 = load("output_00006/info_00006.txt", fields =
>> ["Density","x-velocity", "y-velocity", "z-velocity", "Pressure"])
>> cen = [0, 0, 0]
>> box = p6.h.region(cen, 0.2/p6['cm'], 0.3/p6['cm’])
>>  print box["Density”]
>>
>>  I get this error:
>>
>>  TypeError: 'float' object has no attribute ‘__getitem__'
>>
>>  I have tried creating a sphere as a data container and this works for
>> the Density, but then when I try to take the AverageDensity in the sphere:
>>
>>  sphere = p6.h.sphere(cen, 0.7/p6['cm’])
>> print sphere['AveragedDensity’]
>>
>>   I get this error:
>>
>>  enerationInProgress                      Traceback (most recent call
>> last)
>> <ipython-input-28-574d78c4fb5c> in <module>()
>> ----> 1 print sphere['AveragedDensity']
>>
>>  /Applications/Code/yt/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc
>> in __getitem__(self, key)
>>     187                 return self.field_data[f]
>>     188             else:
>> --> 189                 self.get_data(f)
>>     190         # Note that this is less succinct so that we can account
>> for the case
>>     191         # when there are, for example, no elements in the object.
>>
>>  /Applications/Code/yt/yt-x86_64/src/yt-hg/yt/data_objects/data_containers.pyc
>> in get_data(self, fields)
>>     514             return
>>     515         elif self._locked == True:
>> --> 516             raise GenerationInProgress(fields)
>>     517         # At this point, we want to figure out *all* our
>> dependencies.
>>     518         fields_to_get = self._identify_dependencies(fields_to_get)
>>
>>  Any idea what I am doing wrong or if there is another way to go about
>> this?
>>
>>  Thanks
>>
>>  Kearn
>>
>> _______________________________________________
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>> yt-users at lists.spacepope.org
>> http://lists.spacepope.org/listinfo.cgi/yt-users-spacepope.org
>>
>>
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