My guess is that your on Windows. If so, make sure to change settings in Explorer to always show filename extensions, because now I think it drops .txt when it lists/displays your files (this is one of the most annoying features in Windows). Also, some basic editors add .txt extension when you save a file the first time. You can try to put quotation marks to force it not to, e.g. "RHtestsV4.r". Henrik On Nov 6, 2015 15:23, "Chattopadhyay, Somsubhra" <sch298 at g.uky.edu> wrote: Dear all, I am a beginner in R and want to ask a simple question. I have a code file in text format which I need to change to .r format only. For example now it is RHtestsV4.r.txt which needs to be changed to just RHtestsV4.r. I tried this sub("^([^.]*).*", "\\1", 'RHtestsV4.r.txt') [1] "RHtestsV4" But this didn't seem to work as again when I try to call the function using source("RHtestsV4.r") The error message is Error in file(filename, "r", encoding = encoding) : cannot open the connection In addition: Warning message: In file(filename, "r", encoding = encoding) : cannot open file 'RHtestsV4.r': No such file or directory I think it is due to the format of the file. Please help me to convert the file to .r format. Thanks Som -- Somsubhra Chattopadhyay Graduate Research Assistant Biosystem and Agricultural Engineering Department University of Kentucky, Lexington, KY 40546 Email: schattop14 at uky.edu Cell: 9198026951 [[alternative HTML version deleted]] ______________________________________________ R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see 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. [[alternative HTML version deleted]]