Hipparchus 3.1

Version 3.1 is a maintenance release.

Highlights in the 3.1 release are:

• Add public, static access to integrators name.
• Add possibility to use real coefficients for Butcher array based Field integrators.
• Added constrained optimization. Thanks to Francesco Rocca.
• Added GCD and LCM to {Big}Fraction. Thanks to Axel Kramer.
• Add default implementations in CalculusFieldElement and inheritors.
• Add square method to CalculusFieldElement.
• Added Gauss-Markov order 1 autoregressive process generation.
• Added equals and hashCode to OpenIntTo{Double|Field}HashMap.
• Allow variable arguments for building PolynomialFunction.
• Extracted class JacobiKey from PolynomialsUtils.
• Allow retrieving correct Cardan/Euler angles even at singularity.
• Improved performance of Gradient.
• Replace uses of scalar multiplication on Field one.
• Rework interfaces for Derivative and FieldDerivative.
• Several bug fixes in field classes and rotation

Hipparchus 3.0

Version 3.0 is a major release of Hipparchus.
The main changes are:

• Field version of Erf and Gamma classes.
• A new Blendable interface for data blending
• Torque-free motion model for non-symmetrical rigid body
• A SmoothStepFactory which allow for quick creation of common and generic smoothstep function.
• Replacement of EigenDecomposition by EigenDecompositionSymmetric and EigenDecompositionNonSymmetric.
• Separation of {Field}ODEEventDetector and {Field}ODEEventHandler.
• Improved compatibility with recent JDK.
• Many bug fixes in FastMath, polynomial functions, eigen decomposition, etc.

Hipparchus 2.3

• Allowing configuration of RandomPercentile in StreamingStatistics.
• Added new signature for SequentialGaussNewtonOptimizer.withAPrioriData
• Allowing to define the Cholesky decomposition thresholds.
• Changed HessenbergTransformer visibility to public.
• Changed SchurTransformer visibility to public.
• Fixed wrong negation of point on the 2-sphere.

Hipparchus 2.2

• Addition of Unscented Kalman Filter for non linear estimations,
• Addition of {Field}TaylorMap, supporting evaluation, composition and inversion.

Hipparchus 2.1

Version 2.1 is a maintenance release.

Highlights in the 2.1 release are:

• addition of 3D version of complex function plotter,
• addition of ConvergenceCheckerOrMultiplexer and ConvergenceCheckerAndMultiplexer,
• addition of inverse Jacobi elliptic functions,
• optional modified weights to Akima interpolation,
• modified Gram-Schmidt basis orthonormalization process,
• generation of convergents streams in continued fractions,
• addition of equalsIee754 to points in all topologies to handle NaN coordinates.

Hipparchus 2.0

• addition of a sequential Gauss-Newton optimizer
• improved relative scheduling of step handlers and events handlers in ODE addition of a finish callback in step handlers
• replacement of RealFieldElement by CalculusFieldElement interface
• many improvements in Complex to fully implement CalculusFieldElement with correct branch cuts
• addition of FieldComplex
• addition of complex and field complex univariate integrals (including contour integrals)
• addition of field versions of univariate integrators
• implementation of elliptic functions and integrals (for real, complex and general fields)
• faster simultaneous computation of sinh/cosh
• addition of the Ryū algorithm to generate very fast the shortest decimal representation of a floating point number that maintains round-trip safety.