Message-ID: <3E957DB9.9080601@lancaster.ac.uk>
Date: 2003-04-10T14:20:41Z
From: Barry Rowlingson
Subject: Transforming matrix
In-Reply-To: <200304101612.43831.rdiaz@cnio.es>
Ramon Diaz wrote:
> Dear Ramzi,
>
> If you have your TRUE/FALSE values in m1, then do
>
>
>>mode(m1) <- "numeric".
Except that TRUE is 1 and FALSE is 0. The original question was:
>>anyone knows how we can transform a binary matrix with TRUE and FALSE to 0
>>and 1 without looping?
which could imply they want TRUE mapped to 0, and FALSE to 1, which is
done with '1-':
> foo
[,1] [,2] [,3] [,4] [,5]
[1,] FALSE TRUE FALSE FALSE TRUE
[2,] TRUE TRUE TRUE FALSE FALSE
> 1-foo
[,1] [,2] [,3] [,4] [,5]
[1,] 1 0 1 1 0
[2,] 0 0 0 1 1
>
R will convert TRUE to 1 and FALSE to 0 in a numeric context:
> foo*1
[,1] [,2] [,3] [,4] [,5]
[1,] 0 1 0 0 1
[2,] 1 1 1 0 0
Baz