Assuming my documentation is correct, my version shows faq 1 to refer to duplicate times but if file2 is:
01:01:01 11 55 01:01:04 22 66 01:01:07 33 77 01:01:10 44 88 I cannot see what is duplicate? If I create two new files: file3: 01:01:01 11 01:01:04 22 01:01:07 33 01:01:10 44 file4: 01:01:01 55 01:01:04 66 01:01:07 77 01:01:10 88 The previous commands work: z1<-read.zoo("path/to/file1.csv",header=TRUE,sep=",",FUN=times) z2<-read.zoo("path/to/file3.csv",header=TRUE,sep=",",FUN=times) z3<-(na.approx(merge(z1,z2),time(z1))) plot(z3$z1,z3$z2) and: z1<-read.zoo("path/to/file1.csv",header=TRUE,sep=",",FUN=times) z2<-read.zoo("path/to/file4.csv",header=TRUE,sep=",",FUN=times) z3<-(na.approx(merge(z1,z2),time(z1))) plot(z3$z1,z3$z2) Shouldn't I be able to have one file containing all the columns I want to make graphs, instead of having to create numerous files of only two columns of data? ______________________________________________ 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.