Version 4.0 is a major release.
Highlights in the 4.0 release are:
- Add a (backwards) smoother counterpart to the linear Kalman, extended Kalman and unscented filters.
- Add inverse transform method to UnscentedTransformProvider.
- Added reset mechanism in ODE event detection.
- Added FieldPolynomialFunctionLagrangeForm.
- Added native way to stack an independent variable in (Field)Gradient.
- Add boolean for propagation direction in (Field)AdaptableInterval.
- Added getHipparchusVersion method to MathUtils.
- Fixed issue with open boundaries in Euclidean 2D-polygons.
- Increased dimension of directions numbers in Sobol sequence generation.
- Added FieldBivariateGridInterpolator, FieldBilinearInterpolator and FieldBilinearInterpolatingFunction.
- Fixed JUnit pioneer dependency version not compatible with Java 8.
- Changed CDN for faster site load.
- Added moveTowards method to Point interface.
- Rename RungeKutta(Field)Integrator as FixedStepRungeKutta(Field)Integrator.
- Improved robustness of BSP tree operations.
- Rename DEFAULT_MAXCHECK as DEFAULT_MAX_CHECK.
- Made constructors of abstract classes protected when they were public.
- Removed obsolete hipparchus-migration module.
- Added getAddendum() to CalculusFieldElement interface.
- Added getLocalizedString(baseName, key, locale) with default implementation to Localizable interface.
- Migrated tests from JUnit 4 to JUnit 5.
The release notes can be read here: Hipparchus changes report .
The maven artifacts are available in maven central. The sources and binaries can be retrieved from the project download page .