added different number of column using for loop

How to add or multiply two different size of array using the loop iteration process? suppose ,an array

a=[1 2 3 4 5 6 7 8 9 ]
b=[1 2]

and i want increase the size of the 'b' array using. for loop. as like the value of 'b' after using for loop is

= [1 2 1 2 1 2 1 2 1]

Then, we will add or multiply this array.That will very much appreciating if anyone can give a matlab code for this problem....

Answer 1

[Stephen23]

>> c = repmat(b,1,ceil(numel(a)/numel(b)));
>> c = c(1:numel(a))
c =
   1   2   1   2   1   2   1   2   1

[Saiem Solimullah]

matlab 14 doesnt have the "repmat" function...

[Paolo]

The documentation page for repmat indicates that it was introduced before R2006a.