[R] Logical matrices
Aurora Torrente
aurora at ebi.ac.uk
Wed Nov 5 18:23:09 CET 2003
Hello,
I've been trying to work with 0-1 matrices as if they were logical, but
using the logical operators doesn't produce what I need, for using the
matrix B:
[,1] [,2] [,3] [,4] [,5]
[1,] 1 0 1 0 0
[2,] 0 1 0 0 0
[3,] 0 0 1 0 1
gives me the following:
> B[1,]<-B[1,] || B[3,]
> B
[,1] [,2] [,3] [,4] [,5]
[1,] 1 1 1 1 1
[2,] 0 1 0 0 0
[3,] 0 0 1 0 1
instead of :
[,1] [,2] [,3] [,4] [,5]
[1,] 1 0 1 0 1
[2,] 0 1 0 0 0
[3,] 0 0 1 0 1
which is what I need.
I've tried to convert it into a logical matrix, but the result was a vector:
> C<-as.logical(B)
> C
[1] TRUE FALSE FALSE TRUE TRUE FALSE TRUE FALSE TRUE TRUE FALSE
FALSE TRUE FALSE TRUE
What could I do? Thanks for your help,
Aurora
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