Repeating elements of an array

Say for some . How can I create an array of size which is just i.e repeat the elements of x M times each in a row.

Note I have tried using the reshape function but cant work out how to do it in this case.

[James Tursa]

What have you done so far? What specific problems are you having with your code?

Answer 1

[Dave B]

There are two really useful repeat functions: repmat and repelem

repelem is good for repeating an element n times, so I think this is what you want. Here I repeat the numbers in a 3 times each:

a=[1 3 7 9];
repelem(a,3)

ans = 1×12

1 1 1 3 3 3 7 7 7 9 9 9

repmat is good when you want to repeat an array of elements, here I repeat a itself 3 times in the row dimension, and 2 times in the column dimension:

repmat(a,3,2)

ans = 3×8

1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9 1 3 7 9