I reread the data, and use 'na.rm = T' when reading the data. This time it has no such problem. It seems that the existence of NAs convert the integer to factor. Thanks for your help.
On Tue, Sep 20, 2016 at 4:09 PM, Jianling Fan <fanjianl...@gmail.com> wrote: > 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 > [[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.
