How to get value by column name in R?

Question

I have one tab delimited file.

cat file

A      B     C
2      3     4 
3      4     5
2      6     6

infile<-read.table("file",header=TRUE)

I need to get value for column which has header = "A".

How can i get it?

This is a *very* basic question. What have you tried? Did it work/not work/not do what you expected? — A5C1D2H2I1M1N2O1R2T1, Jan 30 '13 at 04:02

score 4 · Accepted Answer · answered Jan 30 '13 at 04:00

4

For a single column data.frame as the output:

infile["A"]
infile[1]

For a vector as the output:

infile[, "A"]
infile[, 1]
infile[["A"]]
infile[[1]]
infile$A

answered Jan 30 '13 at 04:00

score 1 · Answer 2 · answered Jan 30 '13 at 03:59

1

infile$A should work. You need read R book more and then to start your programming trials.

answered Jan 30 '13 at 03:59

Leo5188

1

Not *exactly*. This will result in a vector, not a single-column `data.frame`. But, maybe that's what the OP wants.... – A5C1D2H2I1M1N2O1R2T1 Jan 30 '13 at 04:01

2 Answers2