Here is a solution:

1.  c(x, rep(NA, n-length(x)))
2. which(x==2, arr.ind=TRUE)

Cheers
Andy

__________________________________
Andy Jaworski
518-1-01
Process Laboratory
3M Corporate Research Laboratory
-----
E-mail: apjaworski@mmm.com
Tel:  (651) 733-6092
Fax:  (651) 736-3122



"Eric Turkheimer" <ent3c@virginia.edu> 
Sent by: r-help-bounces@r-project.org
07/07/2008 04:09 PM

To
r-help@r-project.org
cc

Subject
[R] Basic Vector and Matrix Operations






I am wondering if it is possible to perform the following two basic
functions with primitive R functions.  I know I could write functions for
either, but it seems as though they are probably built-in somewhere.

1)  Fill out a vector to a desired length with missing values or zeros. 
So,

x<-c(3,4,5)
f(x,5)

3,4,5,NA,NA

2)  Find the [row,col] location of a particular value in a matrix, eg

x<-matrix(1:9,ncol=3)

f(x,2)

2,1


Thanks.

-- 
Eric Turkheimer, PhD
Department of Psychology
University of Virginia
PO Box 400400
Charlottesville, VA  22904-4400

http://www.people.virginia.edu/~ent3c

434-982-4732
434-982-4766 (FAX)

                 [[alternative HTML version deleted]]

______________________________________________
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.



	[[alternative HTML version deleted]]

