[R] Changing a logical matrix into a numeric matrix

[Søren Højsgaard]

Just multiply by 1:

> m <- matrix(c(T,T,F,T),nr=2)
> m
     [,1]  [,2]
[1,] TRUE FALSE
[2,] TRUE  TRUE
> m*1
     [,1] [,2]
[1,]    1    0
[2,]    1    1





-----Oprindelig meddelelse-----
Fra: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] På vegne af emj83
Sendt: 10. januar 2011 10:17
Til: r-help at r-project.org
Emne: [R] Changing a logical matrix into a numeric matrix


Hi,

I would like to turn my TRUE/FALSE matrix into a 1/0 matrix (i.e. True=1 and
False=0)

      [,1]  [,2]  [,3]  
[1,]  TRUE FALSE FALSE 
[2,]  TRUE  TRUE FALSE 
[3,]  TRUE  TRUE  TRUE 

      [,1]  [,2]  [,3]  
[1,]    1    0     0
[2,]    1    1     0
[3,]    1    1     1

Is there a quick way of doing this without a loop?

Thanks Emma
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