Add the "stringsAsFactors = F" when you read the data, and then convert them to numeric.
On 20 September 2016 at 16:00, lily li <chocol...@gmail.com> wrote: > Yes, it is stored as factor. I can't check out any problem in the original > data. Reread data doesn't help either. I use read.csv to read in the data, > do you think it is better to use read.table? Thanks again. > > On Tue, Sep 20, 2016 at 3:55 PM, Greg Snow <538...@gmail.com> wrote: > >> This indicates that your Discharge column has been stored/converted as >> a factor (run str(df) to verify and check other columns). This >> usually happens when functions like read.table are left to try to >> figure out what each column is and it finds something in that column >> that cannot be converted to a number (possibly an oh instead of a >> zero, an el instead of a one, or just a letter or punctuation mark >> accidentally in the file). You can either find the error in your >> original data, fix it, and reread the data, or specify that the column >> should be numeric using the colClasses argument to read.table or other >> function. >> >> >> >> On Tue, Sep 20, 2016 at 3:46 PM, lily li <chocol...@gmail.com> wrote: >> > Hi R users, >> > >> > I have a problem in reading data. >> > For example, part of my dataframe is like this: >> > >> > df >> > month day year Discharge >> > 3 1 2010 6.4 >> > 3 2 2010 7.58 >> > 3 3 2010 6.82 >> > 3 4 2010 8.63 >> > 3 5 2010 8.16 >> > 3 6 2010 7.58 >> > >> > Then if I type summary(df), why it converts the discharge data to >> levels? I >> > also met the same problem when reading some other csv files. How to solve >> > this problem? Thanks. >> > >> > Discharge >> > 7.58 :2 >> > 6.4 :1 >> > 6.82 :1 >> > 8.63 :1 >> > 8.16 :1 >> > >> > [[alternative HTML version deleted]] >> > >> > ______________________________________________ >> > R-help@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. >> >> >> >> -- >> Gregory (Greg) L. Snow Ph.D. >> 538...@gmail.com >> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@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. -- Jianling Fan 樊建凌 ______________________________________________ R-help@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.
