[yt-users] length of octree and smoothed arrays

[Matthew Turk]

Hi Desika,

Your particles are pretty randomly distributed, so it's refining
everywhere up to a given level.  Try changing to np.random.normal, but
you might need to clip.  There's also a factor of eight for leaf
nodes, because a leaf node by default becomes eight cells.

http://paste.yt-project.org/show/4782/

This gives the results I was expecting.  Do they look okay to you?

-Matt

On Thu, Jun 12, 2014 at 12:30 PM, Desika Narayanan
<dnarayan at haverford.edu> wrote:
> Hi Matt,
>
> I just did yt update very recently (like an hour ago).  an hg id gives:
>
> yt-hg desika$ hg id
>
> ea182fc68fae (yt-3.0) tip
>
>
>
>
>
> On Thu, Jun 12, 2014 at 2:28 PM, Matthew Turk <matthewturk at gmail.com> wrote:
>>
>> Hi Desika,
>>
>> I actually can't get your script to run.  Which changeset are you on?
>>
>> -Matt
>>
>> On Thu, Jun 12, 2014 at 12:13 PM, Desika Narayanan
>> <dnarayan at haverford.edu> wrote:
>> > Hi Matt,
>> >
>> > Thanks - the numbers are the same as the length of the numbers of ones
>> > in
>> > saved['octree'], total sizes of octree and size of density array:
>> >
>> > saved["octree"].sum()  = 4681
>> > saved["octree"].size  = 37499
>> > ad["deposit", "all_density"].size = 262144
>> >
>> >
>> >
>> >
>> > On Thu, Jun 12, 2014 at 2:06 PM, Matthew Turk <matthewturk at gmail.com>
>> > wrote:
>> >>
>> >> Hi Desika,
>> >>
>> >> On Thu, Jun 12, 2014 at 12:04 PM, Desika Narayanan
>> >> <dnarayan at haverford.edu> wrote:
>> >> > Hi All,
>> >> >
>> >> > First, I'm on an updated yt 3.0 updated about 5 minutes ago. (hg id:
>> >> > ea182fc68fae (yt-3.0) tip)
>> >> >
>> >> > This might be related to Matt's update on octree on June 8th (in
>> >> > response to
>> >> > the CIC stuff) that I don't quite understand, but I've run into the
>> >> > following issue highlighted in the example code:
>> >> >
>> >> > http://paste.yt-project.org/show/4781/
>> >> >
>> >> > Here, I create a fake data set (motivated by Nathan's shared notebook
>> >> > earlier this week), construct the octree, and then smooth the density
>> >> > onto a
>> >> > grid with:
>> >> >
>> >> >>density = ad["deposit","all_density"]
>> >> >
>> >> > What I find is that the number of elements in the density array is
>> >> > not
>> >> > the
>> >> > same as the number of 0's (i.e Falses) in the generated octree
>> >> > (revealed
>> >> > by
>> >> >
>> >> >>saved["octree"]
>> >> >
>> >> > in the above script).   Nominally, I thought the smoothing happened
>> >> > onto
>> >> > the
>> >> > same octree mesh that I generate with
>> >> > ds.index.oct_handler.save_octree().
>> >> > Is this not the case?  Or, is there a way to make it the case in the
>> >> > order
>> >> > that I call things?
>> >>
>> >> No, it should all be the same.  What're the values of:
>> >>
>> >> saved["octree"].sum()
>> >> saved["octree"].size
>> >> ad["deposit", "all_density"].size
>> >>
>> >> >
>> >> > Thanks,
>> >> > desika
>> >> >
>> >> >
>> >> >
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