Is possible put a vector as a diagonal of matrix ?

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Alex
Alex 2014-2-13
评论： Jos (10584) 2014-2-13
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 ?

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回答（3 个）

Andrei Bobrov
Andrei Bobrov 2014-2-13
编辑：Andrei Bobrov 2014-2-13
blkdiag(A,A,A)
or
A = [1 2];
n = 4;
a1 = repmat({A},n,1);
out = blkdiag(a1{:});
Azzi Abdelmalek
Azzi Abdelmalek 2014-2-13
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) 2014-2-13
A = [1 2] ;
n = 3 ;
B = kron(eye(n),A)
  2 个评论
Jos (10584)
Jos (10584) 2014-2-13
You're welcome. If you're satisfied you can accept the answer so others know as well.

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