[R] Basic Vector and Matrix Operations

From: Eric Turkheimer <ent3c_at_virginia.edu>
Date: Mon, 07 Jul 2008 17:07:15 -0400


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)

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