[R] How to stack the columns of matrix

Roger Bivand Roger.Bivand at nhh.no
Wed Jun 12 15:55:58 CEST 2002

On Wed, 12 Jun 2002, Dr. Peter Schlattmann wrote:

> Dear all,
> I need to stack the columns of a matrix with a variable number of columns.
> I am aware of 
> new<-c(a[,1],a[,2])
> if I have a matrix 'a' with e.g. two columns. For a simulation study I
> need to stack 
> the matrix with a variable number of columns. Is there a way to do this?

aa <- matrix(1:25, nrow=5)

as.vector() seems to stack as you require by column.


Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Breiviksveien 40, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93
e-mail: Roger.Bivand at nhh.no
and: Department of Geography and Regional Development, University of
Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland.

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