MATLAB: Array to matrix

Question

Hi all,

I have an array like a:

 a=[10  20 30 40];

I want to convert it to the matrix below, without using any for loop just by one command.

 b=[ 10  10 20 20 30 30 40 40
     10  10 20 20 30 30 40 40
     10  10 20 20 30 30 40 40];

How can I do it. Thank you,

Answer 1

a = [10  20 30 40]; 
b = kron(a,ones(3,2))