Hi David,
This was useful, thanks.
The example was just that, there are no "a"s, "b",s etc I was
just trying to show what I was trying to do.
Using m[v,]
where m was the matrix in my example and v the vector of
index values works great as you suggested Thanks.
R is quite a powerful language as I am starting to discover
(and folks on the list here are very helpful).
Regards,
Esmail
David Winsemius wrote:
See if this helps:
> mtx<-matrix( rep(letters[1:4], 6), nrow=4)
> mtx
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] "a" "a" "a" "a" "a" "a"
[2,] "b" "b" "b" "b" "b" "b"
[3,] "c" "c" "c" "c" "c" "c"
[4,] "d" "d" "d" "d" "d" "d"
> mtx[c(2, 4, 1, 3), ]
[,1] [,2] [,3] [,4] [,5] [,6]
[1,] "b" "b" "b" "b" "b" "b"
[2,] "d" "d" "d" "d" "d" "d"
[3,] "a" "a" "a" "a" "a" "a"
[4,] "c" "c" "c" "c" "c" "c"
You can do with that result whatever you want:
assign it, m2 <- mtx[c(2, 4, 1, 3), ]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
