Re: [R] Basic Vector and Matrix Operations

From: <apjaworski_at_mmm.com>
Date: Mon, 07 Jul 2008 16:18:11 -0500


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_at_mmm.com
Tel: (651) 733-6092
Fax: (651) 736-3122

"Eric Turkheimer" <ent3c_at_virginia.edu>
Sent by: r-help-bounces_at_r-project.org
07/07/2008 04:09 PM

To
r-help_at_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_at_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]]
______________________________________________
R-help_at_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.
Received on Mon 07 Jul 2008 - 21:23:30 GMT

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.2.0, at Mon 07 Jul 2008 - 21:31:59 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.

list of date sections of archive