[R] Transforming matrix

[Emmanuel Paradis]

At 15:56 10/04/2003 +0200, vous avez écrit:

>hi everybody,
>anyone knows how we can transform a binary matrix with TRUE and FALSE to 0 
>and 1 without looping?
>Thx

I guess you mean:

  TRUE ==> 1
FALSE ==> 0

as this is the rule when logicals are converted into numerics. Then, if M 
is your matrix, you can do:

mode(M) <- "numeric"

If you actually want:

  TRUE ==> 0
FALSE ==> 1

then:

M <- !M
mode(M) <- "numeric"

should do it.

HTH

EP



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