(This article was first published on Thinking inside the box , and kindly contributed to R-bloggers)

Conrad rolled up a new Armadillo release 3.820 (following two minor fix release in the 0.3.810 series of which we packaged the one that was relevant for us). This new version is now out in a release 0.3.820 of RcppArmadillo which is already on CRAN and in Debian.

The summary of the main changes follows:

### Changes in RcppArmadillo version 0.3.820 (2013-05-12)

• faster as_scalar() for compound expressions

• faster transpose of small vectors

• faster matrix-vector product for small vectors

• faster multiplication of small fixed size matrices

Courtesy of CRANberries, there is also a diffstat report for the most recent release As always, more detailed information is on the RcppArmadillo page. Questions, comments etc should go to the rcpp-devel mailing list off the R-Forge page.