Create the matrix with some limits

How should I do if I want to build a matrix like [1 2 1 2 ......](which length is 10) with two instructions.And one of the instructions is n=10.

I do'nt know how to do it without 'if' and 'for'.

Answer 1

[Andrei Bobrov]

kron(ones(1,10),1:2)

[Lee hsuan]

Thank you. I forgot this function.Love you dude.

Answer 2

[KSSV]

p = [1 2] ;
n = 10 ;
q = repmat(p,1,n)

[Lee hsuan]

I think this is the three-instructions solution.If l'm wrong ,please tell me. Thank you.