Excentury supports the use of armadillos datatypes. Armadillo is a C++ linear algebra library. See more information on the library at http://arma.sourceforge.net/.
To see an example see the following directory
There we can find xcpp/arma.xcpp which contains an example. We also need to consider the configuration file xcpp.config since it contains information on how to compile excentury files using the armadillo library.