How to copy copy column with loop?

Dear all.

I have problem to copy the first and last with loop.

I have matrix like

1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8

So I want to copy and place column in same matrix.

For example, I want to copy and adding head column 3 times and tail column 2 time to get new matrix like

1 1 1 1 2 3 4 5 6 7 8 8 8
1 1 1 1 2 3 4 5 6 7 8 8 8
1 1 1 1 2 3 4 5 6 7 8 8 8

How do code it.

Best.

Answer 1

[Andrei Bobrov]

A = [ 1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8]

out = [A(:,ones(3,1)) A A(:,end*ones(2,1))]

OR

out = A(:,[ones(1,3) 1:end end*(ones(1,2))])

Answer 2

[C.J. Harris]

Using 'repmat' is also a possibility:

A = [ 1 2 3 4 5 6 7 8
      1 2 3 4 5 6 7 8
      1 2 3 4 5 6 7 8]

out = [repmat(A(:,1),1,3) A repmat(A(:,end),1,2)]