[AGORA-mailing-list] ANN: ytree 2.2 released

[Britton Smith]

Hi everyone,

ytree version 2.2 is released!

ytree is an extension of yt for working with merger-tree data from
multiple sources.

This release adds a couple new features as well as improvements for
i/o and memory usage.

- New feature: vector fields return x/y/z components of a vector as a
  single array with automatically created magnitude fields.
- New feature: a select_halos function to search all trees for halos
  matching specified criteria.
- Enhancement: significant refactors of the field and i/o systems to
  reduce memory, speed up field access, and simplify implementing new
  frontends.
- Enhancement: upgrades to the testing infrastructure.

ytree can be installed with pip:
pip install ytree

or from source, by going to https://github.com/brittonsmith/ytree
git clone https://github.com/brittonsmith/ytree
cd ytree
pip install -e .

Full documentation can be found at http://ytree.readthedocs.io/.

As always, ytree would be nothing without the wonderful yt community.
Thanks to all those amazing people!

Britton
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