Just a quick note to say that we're now at RcppArmadillo 0.3.4.2 using Conrad's Armadillo 3.4.2. The blog has a bit more, as usual. Sparse matrix support is slowly getting into Armadillo, but we do not have wrappers. If anybody wants to volunteer... Dirk -- Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com