MATLAB: Creating certain amount of new rows from each row in a matrix

Question

How can I create certain amount of rows from each row? For example

A=[a b c d

Then I want to create n new rows from the first row, and m new rows from the second and third row.

     e f g h
     i j k l]

from [a b c d] => Let n=2 =>

                             New rows [x y z k
                                       t y j m]

Answer 1

[repmat(A(1,:), n, 1);
 repmat(A(2:end,:), m, 1)]