Categorical data support. Performance improvements.

0.1.4 (19 August 2016)

• Major Enhancements
  • Added new dependency 'backports' to support #to_h in Ruby 2.0. (@lokeshh)
  • Greatly improve code test coverage. (@zverok)
  • Greatly refactor code and make some methods faster, smaller and more readable. (@zverok)
  • Add support for categorical data with different coding schemes and several methods for in built categorical data support. Add a new index 'Daru::CategoricalIndex'. (@lokeshh)
  • Removed runtime dependencies on 'spreadsheet' and 'reportbuilder'. They are now loaded if the libraries are already present in the system. (@v0dro)
• Minor enhancements
  • Update SqlDataSource to improve the performance of DataFrame.from_sql. (@dansbits)
  • Remove default DataFrame name. Now DataFrames will no name by default. (@zverok)
  • Better looking #inspect for Vector and DataFrame. (@zverok)
  • Better looking #to_html for Vector and DataFrame. Also better #to_html for MultiIndex. (@zverok)
  • Remove monkey patching on Array and add those methods to Daru::ArrayHelper. (@zverok)
  • Add a rake task for running RSpec for every Ruby version with a single command. (@lokeshh)
  • Add rake tasks for easily setting up and testing test harness. (@lokeshh)
  • Added Daru::Vector#to_nmatrix.
  • Remove the 'metadata' feature introduced in v0.1.3. (@gnilrets)
  • Added DataFrame#to_df and Vector#to_df. (@gnilrets)
• Fixes
  • DataFrame#clone preserves order and name. (@wlevine)
  • Vector#where preserves name. (@v0dro)
  • Fix bug in DataFrame#pivot_table that prevented anything other than Array or Symbol to be specified in the :values option. (@v0dro)
  • Daru::Index#each returns an Enumerator if block is not specified. (@v0dro)
  • Fixes bug where joins failed when nils were in join keys. (@gnilrets)
  • DataFrame#merge now preserves the vector name type when merging. (@lokeshh)
• Deprecations
  • Remove methods DataFrame#vector and DataFrame#column. (@zverok)
  • Remove the missing_values feature of daru. The only values that are now treated as 'missing' are nil and Float::NAN. (@lokeshh)