How about:
xx[,-match("x2",names(xx))]
or
xx[,names(xx) != "x2"]
etc.
Bert Gunter
Genentech Nonclinical Biostatistics
650-467-7374
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Erin Hodgess
Sent: Tuesday, April 14, 2009 10:39 PM
To: R help
Subject: [R] excluding a column from a data frame
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?
Thanks,
Erin
--
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodg...@gmail.com
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and provide commented, minimal, self-contained, reproducible code.
