[yt-users] Combining a large number of disjoint shells

Thomas Hansen thansen at princeton.edu
Fri Mar 28 09:32:48 PDT 2014

Hi everybody,

I'm a bit of a yt-newb, and I was wondering what the best way to handle a
problem I'm working on it.

Basically, I have a (large) list of locations (centers of galaxies), and I
want to make a profile plot using the data from all of the shells a
distance r > 10kpc, r < 100 kpsc from each of these centers.  I tried using
a loop with the expression
x = pf.h.boolean([x, "AND", newShell])
to just build the data up over many iterations before finally using
create_profile after the end of the loop, but this approach ran out of
memory.  Is there a better way to get the sum of a large data set?

Thanks in advance for any help,
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