[R] label X-Axis by abother variable in R plot

Hi,   I would like to plot b, c in one plot, and use a as x-aix. How could I do that? Thanks   a,   b, c, 20, 2, 3 21, 4, 5 22, 1, 2 24, 3, 5 50, 3, 6           [[alternative HTML version deleted]] __ R-help@r-project.org mailing list

[R] Get median of each column

I am new to R. How can I get column median? Thanks.Frank [[alternative HTML version deleted]] __ 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/pos