?try On Wed, Jan 21, 2009 at 10:55 AM, Brigid Mooney <bkmoo...@gmail.com> wrote: > Hi All, > > I have an script in R which accepts user inputs for certain parameters, > particularly dates, which the user inputs as character strings. > eg: > > date1 <- "2009-01-21" > > The script later parses the input via the as.Date function: >> as.Date(date1) > > However, as.Date encounters an error when the string does not represent an > actual date. > eg: > > date1 <- "2009-02-29" # Note: 2009 not a leap year >> as.Date(date1) > Error in fromchar(x) : > character string is not in a standard unambiguous format > > As I have many instances of date entries like this, date1, date2, date3, > etc. , I'd like the script to error out gracefully and to be able to point > the user to which date they need to correct, rather than "Error in > fromchar(x)...", which doesn't make it obvious what they need to do to fix > the error. > > Ideally I'd love to send the user a message like: > print(paste(date1, "is an invalid date. Refer to calendar.", sep=" ")) > > If anyone has any suggestions on catching this type of error and feedback > which directs the user, it would be much appreciated. > > For reference, I am using a Windows Vista machine with: >> R.version.string > [1] "R version 2.8.0 (2008-10-20)" > > Thanks, > Brigid > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. >
-- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? ______________________________________________ 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.
