Is possible put a vector as a diagonal of matrix ?

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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 ?

Answers (3)

Andrei Bobrov
Andrei Bobrov on 13 Feb 2014
Edited: Andrei Bobrov on 13 Feb 2014
blkdiag(A,A,A)
or
A = [1 2];
n = 4;
a1 = repmat({A},n,1);
out = blkdiag(a1{:});

Azzi Abdelmalek
Azzi Abdelmalek on 13 Feb 2014
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)

Jos (10584)
Jos (10584) on 13 Feb 2014
A = [1 2] ;
n = 3 ;
B = kron(eye(n),A)
  2 Comments
Jos (10584)
Jos (10584) on 13 Feb 2014
You're welcome. If you're satisfied you can accept the answer so others know as well.

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