The NEWS entry is below; a number of these changes were already in the preceding 0.2.27 release of RcppArmadillo which was base on the beta for Armadillo 2.2.0.
0.2.28 2011-08-02
o Upgraded to Armadillo release 2.2.1 "Blue Skies Debauchery"
* faster multiplication of small matrices
* faster trans()
* faster handling of submatrices by norm()
* added economical singular value decomposition: svd_thin()
* added circ_toeplitz()
* added .is_colvec() & .is_rowvec()
* fixes for handling of complex numbers by cov(), cor(),
running_stat_vec
CRANberries provides
a diffstat report
for 0.2.28 relative to 0.2.27.
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.