[Rcpp-devel] Building/linking trouble with cxxfunction()

I decided that it would be simple enough to write a small package to
show exactly how you would pass a dgCMatrix to an Rcpp-based C++
function and create a smat object.

Excellent, thanks!!  I'll grab it and take a look.

but it is taking a long time.  I don't know if it is a programming
error or the wrong calling sequence or just a slow algorithm but it
has been chugging away for 7 minutes.  In constrast, it takes about 2
seconds to calculate the singular values of that matrix as a dense
Matrix

That probably indicates a problem - in my experience, using a matrix about
10,000 x 10,000 and about 1% nonzero, the SVD calculation of SVDLIBC is
completely dominated by the time spent reading & writing the data file.
Which is why I wanted to write this wrapper in the first place. =)

--
Ken Williams
Senior Research Scientist
Thomson Reuters
Phone: 651-848-7712
ken.williams at thomsonreuters.com
http://labs.thomsonreuters.com