[R] excluding a column from a data frame

[Coen van Hasselt]

Alternatively you could also drop the column like this:

xx$x2<-NULL


On Wed, Apr 15, 2009 at 15:51, Peter Alspach
<PAlspach at hortresearch.co.nz> wrote:
> 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
>>
>> ______________________________________________
>> R-help at 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.
>>
>
> The contents of this e-mail are confidential and may be subject to legal privilege.
>  If you are not the intended recipient you must not use, disseminate, distribute or
>  reproduce all or any part of this e-mail or attachments.  If you have received this
>  e-mail in error, please notify the sender and delete all material pertaining to this
>  e-mail.  Any opinion or views expressed in this e-mail are those of the individual
>  sender and may not represent those of The New Zealand Institute for Plant and
>  Food Research Limited.
>
> ______________________________________________
> R-help at 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.
>