I think ?table
is what you want. -- Bert On Wed, Dec 8, 2010 at 1:19 AM, Ivan Calandra <ivan.calan...@uni-hamburg.de> wrote: > Hi, > > Still another way would be to count the levels of the factors (if it is > indeed a factor): > length(levels(example$V1)) > > Ivan > > Le 12/8/2010 06:08, Jorge Ivan Velez a écrit : >> >> Hi, >> >> One way would be >> >>> example<- read.table(textConnection("V1 V2 >> >> + x y >> + y x >> + z b >> + a c >> + b j >> + d l >> + c o"), header = TRUE) >>> >>> closeAllConnections() >>> example >> >> V1 V2 >> 1 x y >> 2 y x >> 3 z b >> 4 a c >> 5 b j >> 6 d l >> 7 c o >>> >>> with(example, length(unique(V1))) >> >> [1] 7 >>> >>> with(example, length(unique(V2))) >> >> [1] 7 >> >> HTH, >> Jorge >> >> >> On Tue, Dec 7, 2010 at 11:56 PM, zhiji19<> wrote: >> >>> Dear All >>> >>> If I have the following dataset >>> >>> V1 V2 >>> x y >>> y x >>> z b >>> a c >>> b j >>> d l >>> c o >>> >>> How do I use R command to get the total number of different letter in >>> column >>> "V1" >>> column "V1" has 7 different letters. >>> >>> Thank you >>> -- >>> View this message in context: >>> >>> http://r.789695.n4.nabble.com/Summing-up-Non-numeric-column-tp3077710p3077710.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> 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. >>> >> [[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. >> > > -- > Ivan CALANDRA > PhD Student > University of Hamburg > Biozentrum Grindel und Zoologisches Museum > Abt. Säugetiere > Martin-Luther-King-Platz 3 > D-20146 Hamburg, GERMANY > +49(0)40 42838 6231 > ivan.calan...@uni-hamburg.de > > ********** > http://www.for771.uni-bonn.de > http://webapp5.rrz.uni-hamburg.de/mammals/eng/1525_8_1.php > > ______________________________________________ > 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. > -- Bert Gunter Genentech Nonclinical Biostatistics ______________________________________________ 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.