[Rcpp-devel] symmatu does not give symmetric matrix

[Dirk Eddelbuettel]

Thanks to both Yixuan and Doug for coming in with actual clues.

We have had 'add access to crossprod' as a TODO for Rcpp for ages.  Might be
nice to add helper functions for this as these are indeed commonly used
interfaces to frequentluy needed LAPACK/BLAS functionality.  Then again,
leaving it to (Rcpp)Armadillo and (Rcpp)Eigen also makes some sense as Rcpp
itself does little actual matrix math.

But clean pull requests are always welcome :)

Dirk

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