On Tuesday 29 March 2005 08:58, Hai Lin wrote: > Dear R users, > > I have a data generated as the following, > > dat <- data.frame(matrix(sample(24), nrow=4)) > dimnames(dat) <-list(rownames=c('g1','g2','g3','g4'), > colnames=c("A_CH1","A_CH2","B_CH1","B_CH2","C_CH3","C_CH3")) > > » dat > A_CH1 A_CH2 B_CH1 B_CH2 C_CH3 C_CH3 > g1 16 24 7 9 14 20 > g2 4 10 19 22 5 17 > g3 11 18 21 12 13 1 > g4 2 3 15 6 23 8
Why would you want two columns with the same name? > I am trying to plot them pairwise by column(might extend to more than > 3 pairs) Instead manually plotting as below, could you please point > me out with easier ways? If your data frame can be easily restructured (using reshape perhaps), one possible solution would be to use the lattice package: require(lattice) tmd(xyplot(c(A_CH1, B_CH1, C_CH1) ~ c(A_CH2, B_CH2, C_CH2) | gl(3, 4), dat, layout = c(3, 1))) Note that 1. This is with the data frame as it is, except that I assume the last 2 columns are named C_CH1 and C_CH2 2. This plots the mean instead of the sum (but on the other hand, it's a standard plot that way) Deepayan > par(mfrow=c(3,1)) > plot(dat$A_CH1+dat$A_CH2, dat$A_CH1-dat$A_CH2) > plot(dat$B_CH1+dat$B_CH2, dat$B_CH1-dat$B_CH2) > plot(dat[,5]+dat[,6], dat[,5]-dat[,6]) > > Thanks a lot for your help ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html