NEWS

==========================================================================
What is new in version SSJ-2.5
--------------------------------

- package randvar
   * New classes: ExponentialInverseFromDensityGen, NormalInverseFromDensityGen,
                  FNoncentralGen, HypoExponentialGen, StudentNoncentralGen,
                  ConstantGen

- package hups
   * New class: RandomStart
   * HaltonSequence: new methods: addFaureLemieuxPermutations, setStart
   * RadicalInverse: new methods: radicalInverseInteger, radicalInverseLong,
                     getFaureLemieuxPermutation

- package charts
   * New classes: PPPlot, QQPlot
   * New constructors in classes YListChart and YListSeriesCollection

- package probdist
   * New classes: HypoExponentialDist, HypoExponentialDistQuick,
                  ConstantIntDist, ConstantDist
   * Class KolmogorovSmirnovDistQuick: better approximations for cdf, barF

- package stat
   * New class: TallyHistogram

- package util
   * New class: Systeme
   * New package: util.io
   * DMatrix: new methods exp for matrix exponential
   * Num: new methods sumKahan, erfcInv.

- package gof
   * GofStat: new methods:  chi2(OutcomeCategoriesChi2, int[]),
         andersonDarling(double[]), kolmogorovSmirnov(double[]),



==========================================================================
What is new in version SSJ-2.4
--------------------------------

- package probdist
   * New class: BernoulliDist
   * NegativeBinomialDist: new methods getMLE1, getInstanceFromMLE1.
   * TriangularDist: new methods getMLE, getInstanceFromMLE.
   * GammaDist: more precise inverseF for small u.

- package randvar
   * The class Pearson5Gen has been renamed InverseGammaGen.
   * New class: BernoulliGen

- package rng
   * MT19937: correction in the initialization.

- package util
   * Misc: new method evalPoly.
   * RootFinder: new method bisection.



==========================================================================
What is new in version SSJ-2.3
--------------------------------

- package probdist
   * TruncatedDist: bug corrections.
   * BetaSymmetricalDist: more precise barF in the tail.
   * New classes: StudentDist, StudentDistQuick, InverseGammaDist.
       The old class StudentDist has been renamed StudentDistQuick, and
       a new StudentDist has been added.
   * The class Pearson5Dist has been renamed InverseGammaDist.
   * KolmogorovSmirnovDistQuick: better versions of cdf and barF.

- package randvar
   * New classes InverseGammaGen

- package util
   * Num: news methods lnBeta, expBesselK1, erfInv.



==========================================================================
What is new in version SSJ-2.2
--------------------------------

- new package functionfit
   * Provides basic tools for curve fitting, polynomial interpolation,
     least square fit and spline interpolation.

- package probdist
   * New classes InverseDistFromDensity, GumbelDist, FrechetDist.
   * KolmogorovSmirnovDistQuick: more precise versions of cdf and barF.
   * CauchyDist: more precise versions of cdf and barF in the tails.
   * StudentDist: more precise versions of cdf and barF in the tails.

- package randvar
   * New classes InverseFromDensityGen, GumbelGen, FrechetGen.

- package randvarmulti
   * New class IIDMultivariateGen.tex

- package gof
   * New class KernelDensity.

- package hups
   * SobolSequence: new constructor reading its parameters from a file.
   * PointSet: new methods formatPoints, formatPointsBase.

- package functions
   * MathFunctionUtil: new methods gaussLobatto.

- package util
   * Corrections in BatchSort
   * Num: new methods gcd.
   * PrintfFormat: new method formatBase.



==========================================================================
What is new in version SSJ-2.1.3
--------------------------------

  The HTML doc was incomplete for some class methods in SSJ-2.1.2 due to
  the automatic Latex to HTML translator eating some of the text.



==========================================================================
What is new in version SSJ-2.1.2
--------------------------------

- package util
   * New interfaces MultiDimComparable, MultiDimSort

   * New classes SplitSort, OneDimSort, BatchSort, MultiDimComparator
     DoubleArrayComparator.

   * New methods in class Num: harmonic, harmonic2, bernoulliPoly.

- package simevents
   * Events can now be scheduled with different priorities in the event lists.

- package hups
   * New class EmptyRandomization

   * Removed subdirectory dataF2w and all its parameters files. The files have
     been removed also from the ssj.jar archive. (See class F2wStructure).
     The files are now stored at address
          http://www.iro.umontreal.ca/~simardr/ssj-1/dataF2w/.

- package stochprocess
   * New class OrnsteinUhlenbeckProcess. The old class by the same name
     has been renamed OrnsteinUhlenbeckProcessEuler.

   * New class CIRProcess. The old class by the same name has been renamed
     CIRProcessEuler.

- package probdist
   * ChiSquareDist: corrections in the far tails of methods cdf and barF.



==========================================================================
What is new in version SSJ-2.1.1
--------------------------------

- package charts
   * New constructors in each *Chart classes and in the related *SeriesCollection
     classes, that take an additionnal argument (int numPoints).

- package gof
   * Bug correction in GofStat.chi2(IntArrayList data, ....)
     The number of categories was not always returned correctly in m[0].

- package probdistmulti
   * Bug correction in NegativeMultinomialDist.getMaximumLikelihoodEstimate:
     sometimes did not converge to the right values.

- package util
   * New class DMatrix



==========================================================================
What is new in version SSJ-2.1
--------------------------------

- new package charts
   * Allows the creation of charts and graphics, either on screen or in
     Latex format.

- new package stochprocess
   * Provides classes to define stochastic processes and to simulate their
     sample paths.

- package rng
   * Correction of the setSeed and setPackageSeed methods in LFSR113 and
     LFSR258, which did not accept all valid seeds.

   * RandomPermutation: added methods to shuffle parts of arrays.

- package probdist
   * New classes AndersonDarlingDist, AndersonDarlingDistQuick,
     CramerVonMisesDist, KolmogorovSmirnovPlusDist, KolmogorovSmirnovDist,
     KolmogorovSmirnovDistQuick, WatsonGDist, WatsonUDist,
     NormalInverseGaussianDist, RayleighDist, PowerDist, NakagamiDist,
     FoldedNormalDist, HalfNormalDist.

   * New classes ExponentialDistFromMean, GammaDistFromMoments,
     LognormalDistFromMoments, ChiSquareNoncentralDist.

   * Bug correction in HypergeometricDist. Combinations sometimes
     overflowed for large values of parameters.

   * Bug correction in BinomialDist: overflow for some large n and small p.

   * BetaDist: computation of mean and variance for arbitrary [a, b].

   * InverseGaussianDist:  new method inverseF

- package randvar
   * Added constructors, in each class, that do not need a distribution as
     argument but take instead the parameters determining the distribution.

   * New classes ChiSquareNoncentralGen, ChiSquareNoncentralGamGen,
     ChiSquareNoncentralPoisGen, JohnsonSBGen, JohnsonSUGen,
     InverseGaussianGen, InverseGaussianMSHGen, NormalInverseGaussianGen,
     NormalInverseGaussianIGGen, RayleighGen, PowerGen, NakagamiGen,
     FoldedNormalGen, HalfNormalGen.

- package randvarmulti
   * Removed class RandomMultiVariateGen: it has been replaced by
     RandomMultivariateGen.

   * Deprecated class MultiNormalGen: it has been replaced by
     MultinormalCholeskyGen, which has been thinned.

   * New class MultinormalGen, mother of all Multinormal*Gen.
   * New class MultinormalPCAGen.

- package hups
   * New classes LMScrambleShift, RandomShift, SMScrambleShift,
     PointSetRandomization.

   * PointSet: new methods getStream, setStream.

- package gof
   * In class GofFormat, new methods drawDensity, drawCdf.
   * In class FBar, improved methods to compute the complementary distributions.
   * In class FDist, improved methods to compute the distribution functions.

- package util
   * Num: new methods (complementary) error functions erf, erfc. Ratio of
     2 gamma functions gammaRatioHalf.



==========================================================================
What is new in version SSJ-2.0
--------------------------------

SSJ-2.0 works ONLY WITH JDK-1.5 (and later versions of Java), and will not work
with JDK-1.4 or earlier versions of Java.

- new package functions
   * Used to create function objects and to pass an arbitrary function of one
     variable as argument to another function.

- package util
   * New classes ClassFinder, Introspection, TimeUnit, NameConflictException,
     TransformingList, SystemTimeChrono, ThreadCPUTimeChrono, AbstractChrono,
     GlobalCPUTimeChrono, MultivariateFunction, RatioFunction.

   * Removed class MathFunction; it is replaced by the new package functions.

   * New methods in JDBCManager, TextDataReader.

- package rng
   * New interface CloneableRandomStream. All RNG's are now cloneable.

   * All RNG's are now serializable.

   * New class RandomPermutation.

   * New class MRG32k3aL. Same generator as MRG32k3a;
     implementation with type long.

   * Bug correction in initialization of F2NL607.

- package stat
   * New class ObservationListener.

   * new package stat.list
     Provides support for lists of statistical probes.

   * Tally: new methods confidenceIntervalVarianceChi2, formatCIVarianceChi2.

   * TallyStore: the method getArray has been renamed getDoubleArrayList. The
     new method getArray returns a double[].
   * TallyStore: new method quickSort.


- package simevents
   * It is now possible to carry many simulations simultaneously with simulator
     objects and the new Simulator class.

   * New classes ListWithStat, ContinuousState, Simulator.

- package simprocs
   * New classes ProcessSimulator, SSJInterpretationOracle, DSOLProcessSimulator,
        ThreadProcessSimulator

- package gof
   * New method GofStat.chi2Equal.

- package probdist
   * Bug corrections and improvements in some *Dist.getMaximumLikelihoodEstimate

   * Improvements of some distributions far in the tails.

   * Added getParams and toString methods in all probability classes.

   * All methods getMaximumLikelihoodEstimate have been renamed getMLE.
     The old methods are still there but deprecated.

- package randvar
   * The generator NegativeBinomialGen now takes a real as its parameter n.
     The old NegativeBinomialGen with integer n has been renamed as the new
     class PascalGen.

- package randvarmulti
   * Class MultiNormalGen has been renamed MultinormalCholeskyGen.
   * Class RandomMultiVariateGen has been renamed RandomMultivariateGen.



==========================================================================

Update to JDK-1.5 for future versions of SSJ

==========================================================================
What is new in version SSJ-1.2
--------------------------------

- new package probdistmulti
     For multivariate probability distributions.

- new package randvarmulti
     For multivariate non-uniform random number generators.

- package probdist
   * Removed the two-dimensionnal distributions BiNormalDist, BiNormalGenzDist,
     ContinuousDistribution2Dim, BiNormalDonnellyDist, BivariateTDist and
     moved them to package probdistmulti. The BivariateTDist distribution has
     been renamed BiStudentDist.

   * New methods getMean, getVariance and getStandardDeviation to get the mean,
     the variance and the standard deviation for probability distributions.

   * New methods getMaximumLikelihoodEstimate and getInstanceFromMLE that imple-
     ment the maximum likelihood estimator for most probability distributions.

   * New probability distributions: UniformIntDist, FatigueLifeDist, PascalDist,
     FisherFDist, HyperbolicSecantDist, InverseGaussianDist, LoglogisticDist,
     Pearson5Dist, Pearson6Dist.

   * The distribution NegativeBinomialDist now takes a double instead of an int
     as its first parameter; the distribution with an integer as first
     parameter is now called PascalDist (it is the former NegativeBinomialDist).

   * New methods in DistributionFactory.

- package randvar
   * New non-uniform random number generators: UniformIntGen, FatigueLifeGen,
     FisherFGen, HyperbolicSecantGen, InverseGaussianGen, LoglogisticGen,
     Pearson5Gen, Pearson6Gen.

   * New class RandomVariateGenWithCache: caches random values for more
     efficiency when using common random numbers.

   * The generator NegativeBinomialConvolutionGen has been renamed
     PascalConvolutionGen.

- package rng
   * New classes RandomStreamWithCache, which caches random values for more
     efficiency, and TruncatedRandomStream, which generates uniform random
     numbers in a subinterval of [0, 1].

- package util
   * New classes TextDataReader (reads data from text files), JDBCManager (
     interface for accessing a database), MathFunction (to pass an arbitrary
     function as argument to another) and Misc (miscellaneous functions).

   * New RootFinder class to solve one-dimensional non-linear equations.

   * New methods Num.digamma, Num.trigamma, Num.tetragamma: the logarithmic
     derivatives of the Gamma function. Added Num.evalChebyStar for the
     evaluation of shifted Chebychev polynomials.

   * New methods PrintfFormat.formatWithError to print real intervals.



==========================================================================
What is new in version SSJ-1.1.9

- package util
  Added Num.log1p(x) for better accuracy of log(1 + x) at small x.

- package randvar
  Added the classes BetaSymmetricalPolarGen and BetaSymmetricalBestGen
    that generate symmetrical Beta variates.

- package rng
  Provided a faster method to jump the the next substreams in all the WELL*
  generators and in the F2NL607 generator.

- package probdist
  * Replaced all functions Math.log(1+x) by Num.log1p(x) for better accuracy.

  * Corrected LogarithmicDist:
       the probabilities were not always computed correctly.

  * Corrected a bug in BinomialDist:
       the method inverseF(u) had a bug for n = 1.

  * Added the bivariate normal distribution:
       classes BiNormalDist, BiNormalDonnellyDist and BiNormalGenzDist

  * Added the bivariate t distribution:
       class BivariateTDist.

  * Added the Brent-Dekker method to compute the inverse distribution function
    for an arbitrary continuous probability function.

- package hups
  * Changed the constructors in class NiedXingSequenceBase2. The old 3
    arguments constructor has been eliminated and the 4 arguments constructor
    of the previous version has become the 3 arguments constructor
    of the new version. This gives the correct generating matrices for the
    Niederreiter-Xing sequence; the old 3 arguments constructor used
    the transposed generating matrices.

  * Correction in NiedXingSequenceBase2 and in NiedSequenceBase2 and in
    DigitalNetBase2FromFile: did not work correctly for number of bits = w < 31.



==========================================================================
What is new in version SSJ-1.1.8
--------------------------------

- package rng
   LFSR113, LFSR258:
    programmed a faster method nextInt

- package gof
   FBar, FDist:
    added a better approximation for the Anderson-Darling distribution.

- package probdist
   BetaSymmetricalDist:
    added a much faster inverse distribution for parameter alpha > 1.

   BetaDist:
    corrected a bug that gave the wrong values for the CDF for some
    range of parameters.

   BinomialDist, PoissonDist,
    ExponentialDist, JohnsonSUDist, ParetoDist, WeibullDist:
    added a better approximation in the tails of the distributions.

   GammaDist: added a better approximation for large alpha.

   Corrected a bug in DiscreteDistribution: the inverseF function was
   not correct for cdf(x) > 0.5.

   Made a correction in EmpiricalDist: the barF function.

- package randvar
   BetaStratifiedRejectionGen  object always returned 0.
    Bug correction

   GammaRejectionLoglogisticGen object went into infinite loop.
    Bug correction

- package util
   class ChronoSingleThread has been added.