From: Robin Hankin <r.hankin_at_noc.soton.ac.uk>

Date: Tue 22 Aug 2006 - 22:58:47 EST

>

>

R-help@stat.math.ethz.ch 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 Wed Aug 23 00:25:19 2006

Date: Tue 22 Aug 2006 - 22:58:47 EST

Hi

> f <- function(a,n){(1:a)[1:n]}

> t(sapply(c(2,3,4,4,4,5,6),f,n=5))

[,1] [,2] [,3] [,4] [,5]

[1,] 1 2 NA NA NA [2,] 1 2 3 NA NA [3,] 1 2 3 4 NA [4,] 1 2 3 4 NA [5,] 1 2 3 4 NA [6,] 1 2 3 4 5 [7,] 1 2 3 4 5

>

>

**HTH
**
rksh

On 22 Aug 2006, at 12:29, Sara-Jane Dunn wrote:

*> Hi,
**>
*

> I'm having trouble applying the matrix function. I'd like to be

*> able to
**> create a matrix of vectors filled in by rows, which are not all the
**> same
**> length, and so I need it to fill in NAs where applicable.
**>
**> It's easiest to explain with a simple example:
**>
**> Suppose vec = c(3,4,5). How can I form a matrix of the vectors 1:vec
**> [j]
**> for j=1:3?
**> i.e. 1 2 3 NA NA
**> 1 2 3 4 NA
**> 1 2 3 4 5
**> I've tried matrix(c(1:vec[j]),nrow=max(j),ncol=max(vec)) but it will
**> only give me a matrix with repeated values for j=1, like 1 2 3 1
**> 2
**> 3 1 2 3 1
**> 2 3 1 2 3
**>
**> Also using the list function hasn't got me anywhere either..
**>
**> Any help/ideas would be greatly appreciated!
**>
**> Many thanks,
**> Sara-Jane Dunn
**>
**> --
**> This message (and any attachments) is for the recipient on...{{dropped}}
*

R-help@stat.math.ethz.ch 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 Wed Aug 23 00:25:19 2006

Archive maintained by Robert King, hosted by
the discipline of
statistics at the
University of Newcastle,
Australia.

Archive generated by hypermail 2.1.8, at Wed 23 Aug 2006 - 02:22:03 EST.

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