v0.6.1.rst

Version 0.6.1 (December 13, 2011)

New features

• Can append single rows (as Series) to a DataFrame
• Add Spearman and Kendall rank correlation options to Series.corr and DataFrame.corr (:issue:`428`)
• :ref:`Added <indexing.basics.get_value>` get_value and set_value methods to Series, DataFrame, and Panel for very low-overhead access (>2x faster in many cases) to scalar elements (:issue:`437`, :issue:`438`). set_value is capable of producing an enlarged object.
• Add PyQt table widget to sandbox (:issue:`435`)
• DataFrame.align can :ref:`accept Series arguments <basics.align.frame.series>` and an :ref:`axis option <basics.df_join>` (:issue:`461`)
• Implement new :ref:`SparseArray <sparse.array>` and SparseList data structures. SparseSeries now derives from SparseArray (:issue:`463`)
• :ref:`Better console printing options <basics.console_output>` (:issue:`453`)
• Implement fast data ranking for Series and DataFrame, fast versions of scipy.stats.rankdata (:issue:`428`)
• Implement DataFrame.from_items alternate constructor (:issue:`444`)
• DataFrame.convert_objects method for :ref:`inferring better dtypes <basics.cast>` for object columns (:issue:`302`)
• Add :ref:`rolling_corr_pairwise <window.corr_pairwise>` function for computing Panel of correlation matrices (:issue:`189`)
• Add :ref:`margins <reshaping.pivot.margins>` option to :ref:`pivot_table <reshaping.pivot>` for computing subgroup aggregates (:issue:`114`)
• Add Series.from_csv function (:issue:`482`)
• :ref:`Can pass <window.cov_corr>` DataFrame/DataFrame and DataFrame/Series to rolling_corr/rolling_cov (GH #462)
• MultiIndex.get_level_values can :ref:`accept the level name <advanced.get_level_values>`

Performance improvements

• Improve memory usage of DataFrame.describe (do not copy data unnecessarily) (PR #425)
• Optimize scalar value lookups in the general case by 25% or more in Series and DataFrame
• Fix performance regression in cross-sectional count in DataFrame, affecting DataFrame.dropna speed
• Column deletion in DataFrame copies no data (computes views on blocks) (GH #158)

Contributors

.. contributors:: v0.6.0..v0.6.1