> I wonder how efficiently it is to do the following command on a frequent > basis. > nrow(matFF) <- nrow(matFF)+1
Obviously there is overhead (closing file, enlarging file, openeing file). I recommend you measure yourself whether this is acceptable for you. > no large file copying is needed each time the nrow is changed? With a decent filesystem there is *no* copying from smaller to larger file. > would you think I can open 2000 large matrices and leave them open or I need to close each after it is opened and used? Not tested yet. I guess the number of open files can be configured when compiling your OS. Please test and let us know your experience. Regards Jens Oehlschlägel ______________________________________________ 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.
