repeating numbers in matrix

I need to generate a input variation in the form

   % For wxample
col1 :2 4 6 2 4 6 2 4 6 2 4 6
col2 :1 1 1 1 1 1 2 2 2 2 2 2
col2 :5 5 5 5 5 5 5 5 5 5 5 5

is there any shorter way to do it without looping.

Answer 1

[Azzi Abdelmalek]

col1=repmat(2:2:6,1,3)
col2=reshape(repmat(1:2,6,1),1,[])
col3=5*ones(1,12)

Read the documentation

doc repmat
doc reshape

[vinayak hungund]

Super ! Thank you.

Answer 2

[Check Codes]

P=[6 9 13 31 18]; position=5; Q=[285 65]; /Period matrix number of period =3;

o/p part: out_put =[6 9 13 31 285 65 285 65 285 85 18];