Full_Name: Simon de Bernard Version: 2.7.0 (44733) OS: MacOS Submission from: (NULL) (140.77.34.213)
"by" usually takes forever even on a "not so large" data structure. If one can do with a matrix instead of a data.frame, defining by.matrix as by.data.frame modified to convert data back to a data.frame in the "eval" call improves speed by orders of magnitude (whatever that means ;-) ) I'd suggest defining the by.matrix function directly in R... ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
