On 4/15/2009 1:38 AM, Erin Hodgess wrote: > Dear R People: > > Suppose I have the following data frame: > > x1 x2 x3 > 1 -0.1582116 0.06635783 1.765448 > 2 -1.1407422 0.47235664 0.615931 > 3 0.8702362 2.32301341 2.653805 >> str(xx) > 'data.frame': 3 obs. of 3 variables: > $ x1: num -0.158 -1.141 0.87 > $ x2: num 0.0664 0.4724 2.323 > $ x3: num 1.765 0.616 2.654 > > I can exclude the second column nicely via: >> xx[,-2] > x1 x3 > 1 -0.1582116 1.765448 > 2 -1.1407422 0.615931 > 3 0.8702362 2.653805 > > Now suppose I wanted to exclude the column called "x2". If I try: >> xx[,-"x2"] > Error in -"x2" : invalid argument to unary operator > > things don't work. Is there a simple way to do this by name rather > than number, please?
Another way to do it is with subset(): subset(xx, select = -x2) > Thanks, > Erin -- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ 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.
