I saved the data sets as files and then tried to refer to those files. Therefore the instruction:
> z1<-read.zoo(textConnection("/path/to/test1.txt") means that I wanted to replace the manual data entry for Lines1 with a file containing the data. It seems that your instructions only work when data is typed from the command terminal. I cannot use data stored in separated files. Command terminal output below: > lines1<-read.table("/path/to/test1.txt") > lines2<-read.table("/path/to/test2.txt") Warning message: incomplete final line found by readTableHeader on '/path/to/test2.txt' in: read.table("/path/to/test2.txt") This is test1 file: 01:00:00,500 01:00:15,600 01:00:30,750 01:00:45,720 01:01:00,700 01:01:15,725 01:01:30,640 01:01:45,710 This is test2 file: 01:00:12,20 01:01:01,55 01:01:55,22 Then I added a carriage return in test2 file and saved it: 01:00:12,20 01:01:01,55 01:01:55,22 Then I repeated the command terminal entry for lines2: > lines2<-read.table("/path/to/test2.txt") > library(zoo) > library(chron) > z1<-read.zoo(textConnection(lines1),header=FALSE,sep=",",FUN=times) Error in textConnection(lines1) : invalid 'text' argument ______________________________________________ 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.