Is possible put a vector as a diagonal of matrix ?

I mean, if a have:

A= [1 2];

can i get

B=

[1 2 0 0 0 0;

 0 0 1 2 0 0;

 0 0 0 0 1 2];

without any loop ?

Answer 1

[Andrei Bobrov]

blkdiag(A,A,A)

or

A = [1 2];

n = 4;
a1 = repmat({A},n,1);
out = blkdiag(a1{:});

Answer 2

[Azzi Abdelmalek]

n=3;
a=repmat([1 2 zeros(1,2*n-2)],n,1);
b=arrayfun(@(x) circshift(a(x,:),[0 2*(x-1)]),(1:n)','un',0);
out=cell2mat(b)

Answer 3

[Jos (10584)]

A = [1 2] ;
n = 3 ;
B = kron(eye(n),A)

[Alex]

Thats works just fine !! thanks

[Jos (10584)]

You're welcome. If you're satisfied you can accept the answer so others know as well.