v2.9.0 (3 Dec 2015)

New Team Members

• Krzysztof Sakrejda, adding functions in Stan Math and Stan

New Features

• General R-like indexing for arrays and vectors! (#1057)
• Automatic differentation paper: http://arxiv.org/abs/1509.07164
• Changed unit_vector transformation (#1720)
• Automatically detect bitness for Windows 32-bit (#1614)
• Better adaptation for ADVI (#1550, #1559, #1587, #1591, #1593, #1710)

Bug Fixes

• Allows unit_vector to be used in parameters block (#1720)
• Fixed NaN bug in ADVI (#1610)

Maintenance

• Reduced Cpplint warnings to 0! (#1651, #1656, #1701)
• Better ADVI output (#1588)
• Updated logo for doxygen (#1631)
• Refactoring the use of output streams (#1602, 1653, #1662,
  #1670, #1676, #1696, #1601)
• Moved src/stan/services files and namespaces (#1616)
• Updated clang++ compiler options for Mac OS X (#1668)
• Additional testing on Travis CI (#1708)
• Removed unused python script (#1611)
• Updated makefile (#1618, #1655, #1659)

Manual

• Improved Wiener distribution documentation (#1576)
• Corrected bugs and typos (#1617)
• Thanks to Julain King, Ashley Ford, Evelyn Mitchell,
  José Rojas Echenique, Miguel de Val-Borro, Bruno Jacobs,
  Ryan Batt, David Manheim