Greetings. At the moment, I'm applying R to some AIX 'nmon' output, trying to get a handle on some disk performance metrics. In case anyone's interested:
http://docs.osg.ufl.edu/tsm/pdf/ some of them are more edifying than others. (ahem) I'm trying to develop a somewhat general framework for plotting these measures, in the hopes that it's of some use to people other than me. One obstacle I encounter is that, when I select one column out of a data.frame, the result is no longer a data.frame. So, say I've got, in data frame 'input' disk1 disk2 disk3 disk4 T0000 0 1 0 4 T0001 0 1 0 5 T0002 0 1 0 5 T0003 0 2 0 4 T0004 0 2 0 3 T0005 0 1 0 3 T0006 0 0 0 3 and somewhere I've noted a list targets <- c('disk2','disk3') I can say input[,targets] disk2 disk3 T0000 1 0 T0001 1 0 T0002 1 0 T0003 2 0 T0004 2 0 T0005 1 0 T0006 0 0 but if targets <- c('disk2') input[,targets] [1] 1 1 1 2 2 1 0 Ick. I've been reading through the indexing and data.frame docs, and remain unsatisfied so far. Where is my thinking going wrong? - Allen S. Rout ______________________________________________ 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.
