I have a file like this:
a1,a2,a3,b1,b2,b3
1,2,3,4,5,6
0,1,2,3,4,5
...
In interactive command-line R, I type
data<-read.table('file.txt', sep=',', header=TRUE)
I then want to get all the columns which start with the letter a. For this
particular file, I can the type:
data[1:3]
What if i don't know that the columns that start with 'a' are columns 1-3?
Is there any command that will pick out the desired columns automatically?
What if i want to match a generic regular expression instead of just looking
at the first letter?
thanks very much,
Rnewb
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