replace vecmath
The vecmath jar was originally shipped as part of the java extensions for Java 3D. It is a pretty good library - that we use for matrix calculations in the gt-referencing module.
We are using the older version here on the 1.3.2 tag:
Unfortunately not technically open source. As shown by the above three links it has a Java Research License (JRL) for academics wanting to experiment or Java Distribution License (JDL) for commercial binary distribution.
With upgrading no longer an option there is a wide range of options:
- http://jscience.org/
- https://code.google.com/p/efficient-java-matrix-library/
- https://code.google.com/p/gwt-vecmath/ <-- perhaps a drop in replacement
- JAMA
- COLT
- http://mikiobraun.github.io/jblas/ <-- seems to be fast
- Apache commons math
- Efficient Java Matrix Library (EJML) <-- recommended on email list
There is some stack exchange discussion on performance of java matrix libraries which was inconclusive.
Official Fork is GPL
There is an official fork here https://java.net/projects/vecmath. Unfortunately it is has migrated (like the JRE) to using a GPL license making it unsuitable for use in GeoTools.
See the use of LICENSE.txt on svn trunk:
We could drop back to an older version 1.3.1 tag which is on maven central (but still seems to be under binary distribution license).