> I think the root cause of a number of my coding problems in R right > now is my lack of skills in reading and grabbing portions of the data > out of arrays. I'm new at this. (And not a programmer) I need to find > some good examples to read and test on that subject. If I could locate > which column was called C1, then read row 3 from C1 up to the last > value before a 0, I'd have proper data to plot for one line. Repeat as > necessary through the array and I get all the lines. Doing the lines > one at a time should allow me the opportunity to apply color or not > plot based on values in the first few columns. > > Thanks, > Mark > > test <- data.frame(A=1:10, B=100, C1=runif(10), C2=runif(10), > C3=runif(10), C4=runif(10), C5=runif(10), C6=runif(10)) > test<-round(test,2) > > #Make array ragged > test$C3[2]<-0;test$C4[2]<-0;test$C5[2]<-0;test$C6[2]<-0 > test$C4[3]<-0;test$C5[3]<-0;test$C6[3]<-0 > test$C6[7]<-0 > test$C4[8]<-0;test$C5[8]<-0;test$C6[8]<-0 > > #Print array > test
Are the zeros always going to be arranged like this? i.e. for experiment there is a point at which all later values are zero? If so, the following is a much simpler way of getting to the core of your data, without fussing with overly complicated matrix indexing: library(reshape) testm <- melt(test, id = c("A", "B")) subset(testm, value > 0) I suspect you will also find this form easier to plot and analyse. Hadley -- http://had.co.nz/ ______________________________________________ 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.