[R] drop elements of vector by class

[McGehee, Robert]

a <- data.frame(a = 1:2, b = c("a", "b"), c = I(c("a", "b")))

a <- a[ , !sapply(a, class) %in% "factor"]

-----Original Message-----
From: E. Michael Foster [mailto:foster at pop.psu.edu] 
Sent: Friday, June 17, 2005 10:58 AM
To: r-help at stat.math.ethz.ch
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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