[R] drop elements of vector by class

[Dimitris Rizopoulos]

try this

# to get only the factors
macro.f <- macro[sapply(macro, is.factor)]

to drop the factors
macro.nf <- macro[sapply(macro, !is.factor)]

# to get only numerics
macro.n <- macro[sapply(macro, is.numeric)]

and so on.

I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm



----- Original Message ----- 
From: "E. Michael Foster" <foster at pop.psu.edu>
To: <r-help at stat.math.ethz.ch>
Sent: Friday, June 17, 2005 4:57 PM
Subject: [R] drop elements of vector by class


> i'm trying to build a little summary table for the contents of a 
> data frame.
>
> t<-sapply(macro, data.class)
> c<-sapply(macro, length)
> m<-sapply(macro, mean, na.rm=T, digits=2)
> cbind(type=t, n=c , mean=m)
>
> I want to drop the variables that are factors so I can include -max- 
> and
> -min- in my table.
> -macro- contacts the data--how do I drop the variables according to 
> their
> data.class
>
> thanks,
> michael foster
>
>
>
>
> ________________________________________________
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