[R] extract numerical variables from a data frame

[Simon Fear]

for data.frame called dframe:

newframe <- dframe[ , lapply(dframe, is.numeric)]

For the mode of the columns

lapply(dframe, mode)

See ?lapply !!

> -----Original Message-----
> From: Vincent Spiesser [mailto:Vincent.Spiesser at univ-tlse1.fr]
> Sent: 29 August 2003 10:08
> To: R-help at stat.math.ethz.ch
> Subject: [R] extract numerical variables from a data frame
> 
> 
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> 
> Hi
> 
> I try to create from a data frame a new one which contains only the 
> numerical variables (or factorial ones).
> 
> Is there any function which does this task directly ?
> Or, is there any function which return the mode of each columns of a
> data 
> frame. ?
> 
> Thanks a lot for any help you can offer me,
> 
> Vincent Spiesser
> 
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Simon Fear
Senior Statistician
Syne qua non Ltd
Tel: +44 (0) 1379 644449
Fax: +44 (0) 1379 644445
email: Simon.Fear at synequanon.com
web: http://www.synequanon.com
 
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