replace vecmath - STEMLab/geotools GitHub Wiki

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:

• LICENSE.txt
• LICENSE-JDL.txt
• LICENSE-JRL.txt

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:

• LICENSE.txt

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).