Re: [R] Basic Vector and Matrix Operations

From: Erik Iverson <iverson_at_biostat.wisc.edu>
Date: Mon, 07 Jul 2008 16:24:30 -0500

Eric Turkheimer wrote:
> 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
>

For the NA case, see ?length.

> 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.
>



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