[R] How to stack the columns of matrix

[Jonathan Baron]

On 06/12/02 15:36, Dr. Peter Schlattmann wrote:
>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?

I'm not sure what you mean by "stack," but I think

as.vector(a)

will do what you want.  It creates a vector out of a matrix,
column by column.  The length of the vector will be rows x
columns of a.

-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
R page:               http://finzi.psych.upenn.edu/
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