On Sat, 4 Jul 2009, William Simpson wrote:
Can anybody please tell me a good way to do the following?
Not sure how you want cases like x = 1:3, nrow=2 , ncol=7 to be handled,
but for the example you give, this works:
mat <- matrix(0,nr=nrow,nc=ncol)
indx <- outer(
seq( from=0, length=length(x) ),
seq( from=1, by=nrow+1, length=ncol ), "+" )
mat[ indx ] <- x
HTH,
Chuck
Given a vector, number of rows and number of columns, return a matrix
as follows. Easiest to give an example:
x=c(1,2), nrow=5, ncol=4
return the matrix:
1 0 0 0
2 1 0 0
0 2 1 0
0 0 2 1
0 0 0 2
Thanks very much for any help!
Bill
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[email protected] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
[email protected] 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.
