[R] excluding a column from a data frame

[Erin Hodgess]

Great!


Thanks to both of you!

Sincerely,
Erin

On Wed, Apr 15, 2009 at 12:54 AM, Coen van Hasselt
<coenvanhasselt at gmail.com> wrote:
> 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.
>>>
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>



-- 
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com