On 2/16/11 3:55 PM, "Douglas Bates" <ba...@stat.wisc.edu> wrote:
>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.willi...@thomsonreuters.com http://labs.thomsonreuters.com _______________________________________________ Rcpp-devel mailing list Rcpp-devel@lists.r-forge.r-project.org https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/rcpp-devel
