[yt-users] Total quantity projected over

[Geoffrey So]

er change projy_average to projy_proj

From
G.S.

On Fri, Mar 15, 2013 at 2:34 PM, Geoffrey So <gsiisg at gmail.com> wrote:

> I think you can get the number from the projy_average object with
> projy_average.field_data['CellMass']
> and double check that against what you calculate
>
> From
> G.S.
>
>
> On Fri, Mar 15, 2013 at 2:26 PM, Elizabeth Tasker <
> tasker at astro1.sci.hokudai.ac.jp> wrote:
>
>> wonderful!
>>
>> Thank you!
>>
>> Elizabeth
>>
>>
>> On Mar 15, 2013, at 5:17 PM, Matthew Turk <matthewturk at gmail.com> wrote:
>>
>> > Hi Elizabeth,
>> >
>> > On Fri, Mar 15, 2013 at 5:15 PM, Elizabeth Tasker
>> > <tasker at astro1.sci.hokudai.ac.jp> wrote:
>> >> Hi,
>> >>
>> >> When you create a projection:
>> >>
>> >> projy_proj = pf.h.proj(2, 'Density', source=cloud)
>> >>
>> >> is there a way of knowing the sum of the quantity that has been
>> integrated over? (or equally, knowing the integration depth for each cell,
>> so the total quantity can be calculated)?
>> >>
>> >> I'd like to sum up the mass above a certain surface density threshold
>> in my source, "cloud". From the above, projy_proj will tell me which
>> regions of my cloud are above a threshold, but I can't think of an easy way
>> to know how much mass has been summed over in that cell.
>> >>
>> >> projy_average = pf.h.proj(2, "CellMass", weight_field="Ones",
>> source=cloud) will give me an average, but not a total.
>> >
>> > You could sum up the cell sizes:
>> >
>> > (proj["pdx"] * 2.0)**2.sum()
>> >
>> > Note that pdx is half-widths, so we multiply by two.  This will need
>> > to be unit-converted from code to whatever.
>> >
>> > -Matt
>> >
>> >>
>> >> Elizabeth
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