[R] Extracting Numeric Columns from Data Fram

[arun]

Hi,
set.seed(15)
dat1<-data.frame(col1=rnorm(6),col2=rep(1:2,each=3),col3=rep(letters[1:3],2),col4=runif(6),col5=rep(LETTERS[3:5],2))
dat1[,sapply(dat1,class)!="factor"]
#        col1 col2      col4
#1  0.2588229    1 0.5090904
#2  1.8311207    1 0.7066286
#3 -0.3396186    1 0.8623137
#4  0.8971982    2 0.8417851
#5  0.4880163    2 0.4474437
#6 -1.2553858    2 0.9646670

#or
 dat1[,grep("numeric|integer",sapply(dat1,class))]
#        col1 col2      col4
#1  0.2588229    1 0.5090904
#2  1.8311207    1 0.7066286
#3 -0.3396186    1 0.8623137
#4  0.8971982    2 0.8417851
#5  0.4880163    2 0.4474437
#6 -1.2553858    2 0.9646670
A.K.




----- Original Message -----
From: Barry DeCicco <bdecicco2001 at yahoo.com>
To: "r-help at R-project.org" <r-help at r-project.org>
Cc: 
Sent: Saturday, February 16, 2013 1:15 PM
Subject: [R] Extracting Numeric Columns from Data Fram

Hello,

I've got a data frame with a mix of numeric, integer and factor columns.
I'd like to pull out (or just operate only on) the numeric/integer columns.
Every thing I've found in searches is about how to subset by rows,
or how to operate assuming you have the column names.  I'd like to pull
by type.

Thanks!

Barry

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