Hi,
Anther possibility may be to use:
library(MatrixModels)
model.Matrix(~d-1,sparse=FALSE)
#7 x 4 Matrix of class "ddenseModelMatrix"
# dblue dgreen dred dyellow
#1 0 0 1 0
#2 0 1 0 0
#3 0 0 1 0
#4 1 0 0 0
#5 0 1 0 0
#6 0 0 0 1
#7 0 0 1 0
model.Matrix(~d-1,sparse=TRUE)
#"dsparseModelMatrix": 7 x 4 sparse Matrix of class "dgCMatrix"
# dblue dgreen dred dyellow
#1 . . 1 .
#2 . 1 . .
#3 . . 1 .
#4 1 . . .
#5 . 1 . .
#6 . . . 1
#7 . . 1 .
#@ assign: 1 1 1 1
#@ contrasts:
#$d
#[1] "contr.treatment"
A.K.
----- Original Message -----
From: Pete Brecknock <peter.breckn...@bp.com>
To: r-help@r-project.org
Cc:
Sent: Saturday, January 26, 2013 6:27 PM
Subject: Re: [R] Converting column of strings to boolean
domcastro wrote
> Hi
>
> I'm trying to convert a column of strings (nominal types) to a set of
> boolean / binary / logical values. For example, in the column there is
> red, blue, green and yellow. There are 100 rows and each has a colour. I
> want to convert the column to 4 columns: red, blue, green,yellow and then
> either 1 or 0 put in the relevant row.
> Thanks
maybe model.matrix will help ....
# d is my understanding of your data
d<-factor(c("red","green","red","blue","green","yellow","red"))
model.matrix(~d -1)
HTH
Pete
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