[R] excluding a column from a data frame

[Peter Alspach]

Tena koe Erin

xx[, names(xx)!='x2']

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Erin Hodgess
> Sent: Wednesday, 15 April 2009 5:39 p.m.
> 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.hodgess at gmail.com
> 
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> 

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