Dear David, > * David Meyer <zrl...@grpuavxhz-jvra.ng> [2012-11-06 19:49:15 +0100]: > > there is C-code related to *reading* in such a file, but in the > internal libsvm-format, not the matrix.csr format.
How is the libsvm-format differ from matrix.csr format? I actually use matrix.csr only because it prints to what libsvm can read. > There is certainly a way to speed this up, but I am not likely to do > this in the near future. too bad. > On 2012-11-06 19:15, Sam Steingold wrote: >> David, >> thanks for adding the feature. >> >> read.matrix.csr and, especially, write.matrix.csr are extremely slow: >> >> user system elapsed >> 8381.988 3810.396 12345.349 >> >> for a 2797634 x 224 matrix I have to deal with. >> >> The help page >> http://rss.acs.unt.edu/Rdoc/library/e1071/html/read.matrix.csr.html >> says >> >> David Meyer (based on C/C++-code by Chih-Chung Chang and Chih-Jen Lin) >> >> is there any chance that you might consider replacing the R code with >> the original C/C++? -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://truepeace.org http://mideasttruth.com http://openvotingconsortium.org http://memri.org http://pmw.org.il Programming is like sex: one mistake and you have to support it for a lifetime. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
