This package contains the header files for the Eigen C++ template
library. The typical usage is to install this package and list it in
the LinkingTo: line in the DESCRIPTION file of
other packages. The C++ source code and the R source code in this
package are for illustration only. As described at the Eigen project's home page,
http://eigen.tuxfamily.org, Eigen is a versatile, fast, reliable
and elegant collection of C++ classes for linear algebra.