MATLAB: Simple rearrangement of matrix

Question

I want to rearrange a vector A= [1,2,3]' to a vector B=[1,1,2,2,3,3]

Here is what i tried so far:

A = [1,2,3]';
for i = 1:size(A,1)
    B(i,:)=[A(i) ; A(i)];
end
B=B

Which outputs a not quite right answer…:

B =
     1     1
     2     2
     3     3

Any help is aprriciated..

Jens

Answer 1

Hi Jens,

Small modification to what you have done would work, this doesn't require a for loop

A = [1,2,3]';
B = [A A];
B = reshape(B',1,[]);

Hope this helps.

Regards,

Sriram