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How to repeat an array?

Hi, I have an array a = [1 2 3] and I want to repeat it twice so I'll have b = [1 2 3 1 2 3]. I try this code, and of course it won't work as I want.
a = 1:3;
for n = 1:2
b = a;
I don't know what I should write in the for-loop. Could anyone help me? Thank you.

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Answer by Youssef Khmou
on 30 Jan 2015
Edited by Youssef Khmou
on 30 Jan 2015
 Accepted Answer

Many solutions exist for this problem, the first one is the repmat solution:
a=[1 2 3];
The second solution consists of using for loop as follows :
for n=1:3
b=[b a];

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arina octave on 30 Jan 2015
hi Youssef, thank you so much for answering my question again!
Youssef Khmou
on 30 Jan 2015
You are welcome Arina.

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