
                        Apache Commons Math Version 1.2-RC2 
                                   RELEASE NOTES

      
This release combines bug fixes and new features. Most notable among the new 
features are the estimation, optimization, geometry and ode packages added 
from the Mantissa library. Implementations of fast Fourier transform, QR 
decomposition and several numerical integration algorithms have also been 
added, along with enhancements and extensions to packages included in Commons 
Math 1.1. This release is source and binary compatible with earlier versions 
of Commons Math. 

For more information on Apache Commons Math, see
http://commons.apache.org/math/
      
      
                             SUMMARY OF CHANGES

ADDITIONS

* Added the estimation, optimization, geometry and ode packages from the 
  Mantissa library. 
          
* MATH-120. Added Pascal distribution implementation. Thanks to Todd C. 
  Parnell. 
          
* MATH-148. Added QR Decomposition. Thanks to Joni Salonen. 
          
* MATH-140. Added Fast Fourier Transform implementation. Thanks to Xiaogang 
  Zhang. 
          
* MATH-173. Added one-way ANOVA implementation. Thanks to Bob MacCallum. 
          
* Added an angle normalization method in MathUtils to force angles in some 
  user-defined interval 
          
* Added vectorial covariance computation (either sample or population 
  covariance) 
          
* Added multivariate summary statistics. 
          

BUG FIXES

* Fixed numerous warnings in test code. 
          
* MATH-156. Use the initial guess provided by the user in 
  BrentSolver.solve(), thus improving speed. Thanks to Tyler Ward. 
          
* MATH-18. Made ComplexFormat format double values with a provided 
  NumberFormat instance instead of using the real part format for all values. 
  Thanks to Phil Steitz. 
          
* MATH-60. Modified ProperFractionFormat to reject embedded minus signs. 
  Thanks to Nhung Nnguyen. 
          
* MATH-151. Added a nextAfter method in MathUtils to return the next 
  machine-representable number in a specified direction from a given floating 
  point number. Used this to ensure that MathUtils.round does not return 
  incorrect results for numbers with bad IEEE754 representations. Thanks to 
  Luc Maisonobe. 
          
* MATH-85. Modified getSumSquaredErrors method in SimpleRegression to always 
  return a non-negative result. Thanks to Mark Osborn, Luc Maisonobe. 
          
* MATH-153. Corrected nextInt and nextLong to handle wide value ranges. 
  Thanks to Remi Arntzen. 
          
* MATH-166. Increased default precision of Gamma and Beta functions. Thanks 
  to Lukas Theussl. 
          
* MATH-167. Modified NormalDistributionImpl.cumulativeProbablity to catch 
  MaxIterationsExceededException and return 0 or 1, resp. if the argument is 
  more than 20 standard deviations from the mean. 
          
* MATH-174. Changed Mean.evaluate() to use a two-pass algorithm, improving 
  accuracy by exploiting the the fact that this method has access to the full 
  array of data values. 
          
* MATH-175. Added check and rescaling of expected counts to sum to sum of 
  expected counts if necessary in ChiSquare test. Thanks to Carl Anderson. 
          
* MATH-164. Handle multiplication of Complex numbers with infinite parts 
  specially. 
          
* MATH-182. Add integer overflow checks in Fraction constructor using double 
  parameter. 
          
* MATH-185. Throw EOFException when using empty files with ValueServer in 
  replay and digest modes. 
          
* MATH-184. Fixed AbstractIntegerDistribution cumulativeProbablility(-,-) to 
  correctly handle double arguments. Thanks to Yegor Bryukhov. 
          

UPDATES

* MATH-158. Added log function to MathUtils. Thanks to Hasan Diwan. 
          
* MATH-160. Added two sample (binned comparison) ChiSquare test. Thanks to 
  Matthias Hummel. 
          
* MATH-170. Added SynchronizedDescriptiveStatistics class. Thanks to David J. 
  M. Karlsen. 
          
* MATH-154. Added addAndCheck, mulAndCheck, and subAndCheck MathUtils methods 
  for long integer arguments. Thanks to Remi Arntzen. 
          
* MATH-171. Merged most functions from ComplexUtils into Complex class, added 
  static factory method to Complex. Thanks to Niall Pemberton. 
          
* Deprecated abstract factory methods and made DescriptiveStatistics and and 
  SummaryStatistics concrete classes. Pushed implementations up from 
  DescriptiveStatisticsImpl, SummaryStatisticsImpl. Made implementations of 
  statistics configurable via setters. 
          
* MATH-176. Add errors guessing to least-squares estimators. Thanks to 
  Kazuhiro Koshino. 
          
* MATH-179. Add tests for Fraction constructor using double parameter. Thanks 
  to Niall Pemberton. 
          
* MATH-181. Add Fraction constructor using max denominator value. Thanks to 
  Niall Pemberton. 
          
* Added a equals and hash methods in MathUtils to check for double arrays 
          
* MATH-191. Added getSumOfLogs method to SummaryStatistics and made SumOfLogs 
  instance used by GeometricMean configurable. 
          
* MATH-188. Made numerator and denominator final in Fraction and deprecated 
  protected real and imaginary parts fields in Complex, making Fraction 
  immutable and preparing Complex to become fully immutable in 2.0. Thanks to 
  Sebastian Bazley. 
          
DEPRECATIONS SUMMARY

* The abstract factory pattern used to enable pluggable implementations in the
  statistics, analysis and distributions packages has been deprecated and
  replaced by setter injection.  
  
* Non-localized exception messages and associated constructors have been
  deprecated and replaced by localized versions.
  
* Most methods from the ComplexUtils class have been deprecated, with
  implementations moved to the Complex class.
  
See "clirr-report.html" included in the docs directory of the binary
distribution for a detailed list of API changes. The "errors" reported at the
top of the report are due to protected fields being moved to superclasses.
These fields are still available, so there is no backward compatibility issue.

BUILDING COMMONS MATH

Commons math can be built from the source distribution using Maven 1, Maven 2,
or Ant, launching any one of these from the top-level directory of the unpacked
zip or tarball. For detailed build instructions and information about how to
contribute to Commons Math, see "developers.html" in the docs directory of the
binary distribution.