Hi!
Is there a fast way to duplicate rows in a matrix?
I would like to do the following:
change a matrix A like:
[,1] [,2]
[1,] Kevin 1
[2,] Alf 2
into :
[,1] [,2]
[1,] Kevin 1
[2,] Kevin 1
[3,] Alf 2
[4,] Alf 2
i.e. double all rows. The only way I could think off
was: rbind(A[1,],A[1,],A[2,],A[2,]) - which is really
impractible, of course.
Can anyone help, please?
Thank you,
Silvia
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