Question

Possible Duplicate:
Drop Columns R Data frame

Let’s say I have a dataframe with column c1, c2, c3.

I want to list just c1 and c2. How do I do that?

I’ve tried:

head(data[column!="c3"])
head(data)[,2]
head(data[!"c3"])

Answer 1

You can index and use a negative sign to drop the 3rd column:

data[,-3]

Or you can list only the first 2 columns:

data[,c("c1", "c2")]
data[,1:2]

Don’t forget the comma and referencing data frames works like this: data[row,column]