Plex is a software package for computing persistent homology of finite
simplicial complexes, often generated from point cloud data. This is the
third version of Plex, and because it is written in Java it is often
referred to as JPlex. JPlex can be run in Matlab or in a standalone mode, using an
integrated Java interpreter called
Beanshell (our thanks to the author,
Patrick Niemeyer, for allowing us to repackage the interpreter with our
library). The initial goals of this rewrite were to fix several
longstanding memory management problems and to make installation easy.
These goals were met, but our experience is that JPlex
is also faster and capable of running larger cases than the previous
versions. The complete library is in a single jar file that is
currently less than
.5 megabytes, including the Beanshell
interpreter, and requires no compilation. You must, however, have access to
a version 1.5 or later java runtime, either through Matlab or directly
through a command line. This is explained in more detail either in the
tutorials or in the online documentation.
Here is the JPlex library and the javadoc tree.
The complete source code for the library is available either as a Tarball or as a Zip file. This version of Plex can easily be extended by Java programmers.
We have both a JPlex with Matlab tutorial and a JPlex with BeanShell tutorial. The former is for those with access to Matlab, and the latter is for those wishing to run plex standalone. To complete the tutorials, you will need the companion files for the Matlab version or the companion files for the standalone version.
There are several other software packages for computing persistent homology.
Here is a version of the Beanshell manual and the Beanshell documentation.
Please direct bug reports to Henry Adams.