repeating elements of a vector in a certain manner

Hello all, I have a vector A of length n. I would like to create a new vector B which contains each element of A repeated m times; i.e. length of B is mxn. For example, let A=[2 4 5 7 8]; m=3; then, B=[2 2 2 4 4 4 5 5 5 7 7 7 8 8 8]; What is the fastest way of doing that? Thanks!

Answer 1

[Star Strider]

Two options, both producing the same output:

A=[2 4 5 7 8];
B1 = repelem(A,3)                                % Introduced in R2015a
B2 = reshape(repmat(A, 3, 1), [], 1)'

B1 =
     2     2     2     4     4     4     5     5     5     7     7     7     8     8     8

B2 =
     2     2     2     4     4     4     5     5     5     7     7     7     8     8     8

Answer 2

[Walter Roberson]

B = reshape([A;A;A], 1, [])

[Mnr]

Thanks! but what about for any m? In other words, how can I write reshape([A;A;A]) for m>3?