On Oct 8, 2009, at 4:18 PM, David Winsemius wrote:
On Oct 8, 2009, at 4:14 PM, Ashta wrote:
Hi all,
I have a matrix named x with N by C
I want to select every 5 th rrow from matrix x
I used the following code
n<- nrow(x)
for(i in 1: n){
+ b <- a[i+5,]
b
}
Error: subscript out of bounds
What did you expect when "i" in your loop counter became one greater
than the number of rows?
Perhaps (assuming that b has been created with same dimensions as a:
for (i in seq(1, nrow(a), by= 5) { b=a[i,] }
Which I suspect will not give you what you want, either, since that
code would overwrite be each time through the loop, so maybe:
for (i in seq(1, nrow(a), by= 5) { b=rbind(b, a[i,] ) }
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
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.
