Hi,
If I have a matrix like
1  2  3  4
5  6  7  8,
how can I repeat two rows as whole, to be like
1  2  3  4
5  6  7  8
1  2  3  4
5  6  7  8?
 
Since I have more two rows in a matrix and I need to repeat many times, I wonder whether there is a convenient command to do so.
 
Thanks!
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