[R] strsplit a matrix
James Perkins
jperkins at biochem.ucl.ac.uk
Mon Aug 10 18:56:37 CEST 2009
Dear all,
I am trying to split a matrix into 2 as efficiently as possible.
It is a character matrix:
1 2 3
1 "2-271" "2-367" "1-79"
2 "2-282" "2-378" "1-90"
3 "2-281" "2-377" "1-89"
I want to make 2 matrices from this, as succinctly and efficiently as
possible.
I've tried such things as sapply(matrix, strsplit, "-") and tried to go
from there, but I can't figure it out! So far I do it with a 2D for loop
which can't be efficient!
firstPartM <- matrix(ncol= dim(zzz)[2], nrow= dim(zzz)[1])
secondPartM <- matrix(ncol= dim(zzz)[2], nrow= dim(zzz)[1])
for(i in 1:dim(zzz)[1]) {
for(j in 1:dim(zzz)[2]) {
splitS <- strsplit(zzz[i,j],"-")
firstPartM[i,j] <- splitS[[1]][1]
secondPartM[i,j] <- splitS[[1]][2]
}
}
Cheers,
Jim
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