[Numpy-discussion] [ANN] la 0.2, the labeled array

[Keith Goodman]

I am pleased to announce the second release of the la package, version 0.2.

The main class of the la package is a labeled array, larry. A larry
consists of a data array and a label list. The data array is stored as
a NumPy array and the label list as a list of lists.

larry has built-in methods such as movingsum, ranking, merge, shuffle,
zscore, demean, lag as well as typical Numpy methods like sum, max,
std, sign, clip. NaNs are treated as missing data.

Alignment by label is automatic when you add (or subtract, multiply,
divide) two larrys.

larry adds the convenience of labels, provides many built-in methods,
and let's you use many of your existing array functions.

Download: https://launchpad.net/larry/+download
docs  http://larry.sourceforge.net
code  https://launchpad.net/larry
list  http://groups.google.ca/group/pystatsmodels

=============
Release Notes
=============

la 0.2 (avocado)
================

*Release date: 2010-04-27*

New larry methods
-----------------
- lix : Index into a larry using labels or index numbers or both
- swapaxes : Swap the two specified axes
- sortaxis : Sort data (and label) according to label along specified axis
- flipaxis : Reverse the order of the elements along the specified axis
- tocsv : Save larry to a csv file
- fromcsv : Load a larry from a csv file
- insertaxis : Insert a new axis at the specified position
- invert : Element by element inverting of True to False and False to True

Enhancements
------------
- All larry methods can now take nd input arrays (some previously 2d only)
- Added ability to save larrys with datetime.date labels to HDF5
- New function (panel) to convert larry of shape (n, m, k) to shape (m*k, n)
- Expanded documentation
- Over 280 new unit tests; testing easier with new assert_larry_equal function

Bug fixes
---------
- #517912: larry([]) == larry([]) raised IndexError
- #518096: larry.fromdict failed due to missing import
- #518106: la.larry.fromdict({}) failed
- #518114: fromlist([]) and fromtuples([]) failed
- #518135: keep_label crashed when there was nothing to keep
- #518210: sum, std, var returned NaN for empty larrys; now return 0.0
- #518215: unflatten crashed on an empty larry
- #518442: sum, std, var returned NaN for shapes that contain zero: (2, 0, 3)
- #568175: larry.std(axis=-1) and var crashed on negative axis input
- #569622: Negative axis input gave wrong output for several larry methods