[R] How to stack the columns of matrix

[Dr. Peter Schlattmann]

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?

Many thanks in advance
Peter


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