Re: [R] drop elements of vector by class

From: McGehee, Robert <Robert.McGehee_at_geodecapital.com>
Date: Sat 18 Jun 2005 - 01:30:48 EST


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@pop.psu.edu] Sent: Friday, June 17, 2005 10:58 AM
To: r-help@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



E. Michael Foster
(W) 814-865-1923
(Fax) 814-863-0000

After 7/1

Work:
Professor of Maternal and Child Health
School of Public Health
University of North Carolina, Chapel Hill Rosenau Hall, CB# 7445
Chapel Hill, NC 27599-7445

Home:
309 Old Larkspur Way
Chapel Hill, NC 27516

UNC School of Public Health--voted #2 SPH by

. US News
. Association of Hand-to-Fin Carp Fisherman
. Iron Chef (not to be confused with the Iron Dukes!)



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html

R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Jun 18 02:56:19 2005

This archive was generated by hypermail 2.1.8 : Fri 03 Mar 2006 - 03:32:48 EST