[R] [Q] extracting lower diagonal elements of a matrix
Christos Hatzis
christos at nuverabio.com
Fri Jan 27 07:22:20 CET 2006
Try
s <- matrix(rnorm(36,0,1),nrow=6)
s[col(s)<row(s)]
Courtesy of V&R.
-Christos
-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Taka Matzmoto
Sent: Friday, January 27, 2006 1:13 AM
To: r-help at stat.math.ethz.ch
Subject: [R] [Q] extracting lower diagonal elements of a matrix
Hi R users
I like to extract lower diagonal elements of a matrix in such a way like,
data[1,2], data[1,3], ...., data[5,6] are extracted from a matrix called
'data'
This short script below is what I have written so far.
##########################################
data <- matrix(rnorm(36,0,1),nrow=6)
temp<-c()
for (i in 1:(nrow(data)-1))
{
for (j in (i+1):nrow(data))
{
temp<-append(temp,data[j,i])
}
}
##########################################
Is there any function for this? or is there any elegant way to do this
task?
Thanks in advance.
TM
______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
More information about the R-help
mailing list