Hi,
On Jul 9, 2009, at 11:40 AM, Juliet Hannah wrote:
Hi,
#make example data
dat <- data.frame(matrix(rnorm(15),ncol=5))
colnames(dat) <- c("ab","cd","ef","gh","ij")
If I want to get a subset of the data for the middle 3 columns, and I
know the names of the start column and the end column, I can do this:
mysub <- subset(dat,select=c(cd:gh))
If I wanted to do this just on the column names, without subsetting
the data, how could I do this?
mynames <- colnames(dat);
#mynames
#[1] "ab" "cd" "ef" "gh" "ij"
Is there an easy way to create the vector c("cd","ef","gh") as I did
above using something similar to cd:gh?
How about just taking your mynames vector? eg:
R> mynames[2:4]
[1] "cd" "ef" "gh"
R> dat[, mynames[2:4]]
cd ef gh
1 1.7745386 1.0958930 -0.07213304
2 0.7480372 -0.1364458 -0.62848211
3 -0.5477843 1.5811382 -0.74404103
-steve
--
Steve Lianoglou
Graduate Student: Physiology, Biophysics and Systems Biology
Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos
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