Hipparchus 1.4 Released

We just cut another Hipparchus release, which should now be available on Maven Central.  Hipparchus is a library of lightweight, self-contained  mathematics and statistics components addressing the most common  problems not available in the Java programming language. 

New features and enhancements include:

• Bilinear interpolation for 2D grids
• Field version of sinCos
• Support for complex ordinary differential equations (both primary and secondary equations)
• Accessors for state transition matrix, Jacobian matrix H
• Innovation covariance matrix and Kalman gain in Kalman filters
• Three-dimensional field arrays
• Several fixes in the Euclidean 3D and spherical 2D partitioning 

The release is available on the Hipparchus download page.  The release jars are available from maven central with groupId org.hipparchus and artifactId by library component.  For example, the ODE jar is here:

<dependency>
  <groupId>org.hipparchus</groupId>
  <artifactId>hipparchus-ode</artifactId>
  <version>1.4</version>
  <type>pom</type>
</dependency>

Bug reports, patches, suggestions for improvement are always welcome.   Subscribe to our mailing lists and dive into our source code to get involved.