Fixed javadoc errors. One-sided t-test significance adjustment was reversed in javadoc for boolean-valued test methods. Fixed bug in PolynomialSplineFunction to allow evaluation of the function at the last knot point. Added Weibull distribution implementation. Added Cauchy distribution implementation. Added convenience methods for rounding. Added Fraction class based on commons-lang implementation. With the fraction class, FractionFormat and ProperFractionFormat classes were added to provide fraction formatting and parsing. Fixed error in ChiSquareTestImpl. Tables containing zeros were (incorrectly) causing IllegalArgumentExceptions to be thrown. Removed JDK 1.4-dependent code from CertifiedDataAbstractTest, InvalidMatrixException and MatrixIndexException. Also dropped BeanTransformer, BeanTransformerTest from the release. Fixed cumulative frequency and cumulative percentage problem reported to the commons-dev list by Jon Langlois on 9/14. Integer arguments to getCumXxx were always returning 0 due to type conversion problems. Fixed locale-dependency in ComplexFormat. Renamed univariate package to descriptive and multivariate to regression. Improved efficiency of logGamma method in o.a.c.m.special.Gamma Added subMatrix and matrix-valued row and column accessor methods to RealMatrix, BigMatrix interfaces and RealMatrixImpl, BigMatrixImpl. Implemented equals and hashCode in RealMatrixImpl and BigMatrixImpl. Fixed RealMatrixImpl, BigMatrixImpl toString methods to handle empty matrix. Added support for "population" variance and standard deviation in Variance (resp. StandardDeviation) classes. Removed data mutators from RealMatrix, BigMatrix interfaces and RealMatrixImpl, BigMatrixImpl. RealMatrix and BigMatrix instances are now immutable. Added MatrixUtils class, including static factory methods to create RealMatrix and BigMatrix instances from arrays of various types. Changed factorial methods to return 1 for argument = 0, instead of (incorrectly) throwing IllegalArgumentException. Fixed error in SimpleRegression.getSignificance. Value returned was off by a factor of 2 (did not match javadoc). Refactored distribution package so that mixed distributions and discrete distributions with non-integer values can be represented. Added Distribution base interface as well as IntegerDistribution extending DiscreteDistribution. Previously existing discrete distributions now implement IntegerDistribution. Added Poisson distribution implementation. Eliminated unecessary array copy operations in RealMatrixImpl, BigMatrixImpl add, multiply, solve and subtract operations. This is the first release of Commons Math. Commons Math is a library of lightweight, self-contained mathematics and statistics components. The release candidate is being made available so that users can test the release and provide feedback.