| The Commons Math team is pleased to announce the commons-math3-3.2-SNAPSHOT release! |
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| The Math project is a library of lightweight, self-contained mathematics and statistics components addressing the most common practical problems not immediately available in the Java programming language or commons-lang. |
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| Changes in this version include: |
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| New features: |
| o All contents of package "o.a.c.m.stat.clustering" refactored into |
| new package "o.a.c.m.ml.clustering" and added support for additional |
| distance measures in package "o.a.c.m.ml.distance": "CanberraDistance", |
| "ChebyshevDistance", "EuclideanDistance" and "ManhattanDistance". Issue: MATH-917,MATH-918,MATH-919,MATH-920. Thanks to Reid Hochstedler. |
| o Added Multivariate Normal Mixture Model Fitting by Expectation Maximization. Issue: MATH-817. Thanks to Jared Becksfort. |
| o Added a way to trigger only increasing or decreasing events in ODE integration. Issue: MATH-811. |
| o Added array-scaling methods to MathArrays. Issue: MATH-946. Thanks to Jared Becksfort. |
| o Added the Lévy distribution. Issue: MATH-460. Thanks to Andrew Waterman. |
| o Implementations for inverse error function and inverse complementary |
| error functions have been added. Issue: MATH-948. |
| o Added utilities for prime numbers. Issue: MATH-845. Thanks to Sébastien Riou. |
| o Check bounds in multi-start vector optimizers. Issue: MATH-914. |
| o Added discrete distributions. Issue: MATH-941. Thanks to Piotr Wydrych. |
| o Added Hermite interpolator for RealFieldElement instances. |
| o Added RealFieldElement interface to represent anything that is |
| real number like, implemented by both Decimal64, Dfp and DerivativeStructure. |
| o Added partial derivatives computation for 3D vectors and rotations. |
| o Added accurate linear combination of DerivativeStructure instances, |
| avoiding cancellation. |
| o Added conversion of gradients and Hessians from spherical to Cartesian |
| coordinates in 3D. |
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| Fixed Bugs: |
| o Fixed inverse cumulative probability for uniform distribution. Issue: MATH-957. Thanks to Evan Ward. |
| o "SpearmansCorrelation" now works correctly in case of a provided |
| "NaturalRanking" with a "NaNStrategy.REMOVED" strategy and the input |
| data contains NaN values. From version 4.0 onwards this strategy will |
| not be supported anymore. Issue: MATH-891. |
| o Fixed Complex.reciprocal() for zero argument. Issue: MATH-934. |
| o AbstractRealMatrix will now check for rectangular input arrays in |
| its copySubMatrix methods. Issue: MATH-862. |
| o Increment iteration counter in optimization algorithms. Issue: MATH-949. |
| o Fixed missing update in ODE event handlers, when a RESET_STATE is triggered. Issue: MATH-950. |
| o Fixed infinite loop when NaN occurs in singular value decomposition. Issue: MATH-947. |
| o Extended ranges for FastMath performance tests. Issue: MATH-580. |
| o Finalized implementation of diagonal matrix. Issue: MATH-925. |
| o Added rank revealing QR decomposition. Issue: MATH-630. Thanks to Christopher Nix. |
| o ArrayFieldVector can now be constructed from any FieldVector. Issue: MATH-570. Thanks to Arne Plöse. |
| o Improved checking of null vector elements. Issue: MATH-861. Thanks to Sébastien Brisard. |
| o Fixed generation of long random numbers between two bounds. Issue: MATH-936. |
| o Fixed creation of generic array. Issue: MATH-942. Thanks to Piotr Wydrych. |
| o Fixed abstract test class naming that broke ant builds. Issue: MATH-940. Thanks to Piotr Wydrych. |
| o Allow covariance to be computed for one-dimensional variables. Issue: MATH-939. Thanks to Piotr Wydrych. |
| o Fixed accuracy of 3D Line.revert(). Issue: MATH-938. |
| o Improved javadoc to explain how switching functions should |
| behave across events in ODE events detection. Issue: MATH-937. |
| o Fixed DerivativeStructure.atan2 for special cases when both arguments are +/-0. Issue: MATH-935. |
| o Improved class javadoc wrt convergence criteria and added |
| additional constructors to override the default epsilon and cut-off |
| values in class "SimplexSolver". Issue: MATH-930. |
| o Fixed truncated value in "MultivariateNormalDistribution". Issue: MATH-929. Thanks to Piotr Wydrych. |
| o Made "BitStreamGenerator" implement the "Serializable" interface. Issue: MATH-927. Thanks to Dennis Hendriks. |
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| Changes: |
| o Replaced hard-coded numbers in "LevenbergMarquardtOptimizer". Issue: MATH-956. |
| o Fixed loading of test file when path contains a space. Issue: MATH-955. Thanks to Evan Ward. |
| o Improved speed of FastMath.abs methods for all signatures, by removing branching. Issue: MATH-954. Thanks to Charles Cooper. |
| o Improved speed of several FastMath methods. Issue: MATH-953. Thanks to Charles Cooper. |
| o Improved speed of FastMath copysign methods. Issue: MATH-951. Thanks to Charles Cooper. |
| o Made EmpiricalDisribution smoothing kernel pluggable. Issue: MATH-671. |
| o Allow direct use of SummaryStatistics in one-way ANOVA. Issue: MATH-877. Thanks to Peter Andrews. |
| o Normal distribution now uses a direct implementation of the |
| inverse error function to compute inverse cumulative probability |
| instead of relying on a numerical solver. This is much faster, |
| more accurate and does not need convergence threshold. |
| o Throw "MathUnsupportedOperationException" from optimizers that do |
| not support constraints (previous behaviour was to silently ignore |
| the "SimpleBounds" argument). Issue: MATH-933. |
| o Greater efficiency in "UnitSphereRandomVectorGenerator". Issue: MATH-931. Thanks to Sean Owen. |
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| Have fun! |
| -Commons Math team |
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