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From: dafina on 7 Apr 2010 19:08
How can I merge two diagonal matrix in matlab wtih different dimensions, for example the first one is 6x6 and dhe second is 194x194, in one that is 200x200

thnx
From: Nathan on 7 Apr 2010 19:08
On Apr 7, 4:02 pm, "dafina " <d.xh...(a)gmail.com> wrote:
> how can I merge in matlab two diagonal matrix with different dimensions, for example the first is 6 x 6, and the second is 194x194,  in one diagonal matrix with dimension 200x200.
>
> thnx

Try BLKDIAG

Assume A is your 6x6 matrix and B is your 194x194 matrix:

C = blkdiag(A,B);

C is now the 200x200 diagonal matrix that consists of the diagonals A
and B.

-Nathan
From: dafina on 7 Apr 2010 19:22
Nathan <ngreco32(a)gmail.com> wrote in message <e538a2cb-6542-4ac8-967d-e0600a41d394(a)z7g2000yqb.googlegroups.com>...
> On Apr 7, 4:02 pm, "dafina " <d.xh...(a)gmail.com> wrote:
> > how can I merge in matlab two diagonal matrix with different dimensions, for example the first is 6 x 6, and the second is 194x194,  in one diagonal matrix with dimension 200x200.
> >
> > thnx
>
> Try BLKDIAG
>
> Assume A is your 6x6 matrix and B is your 194x194 matrix:
>
> C = blkdiag(A,B);
>
> C is now the 200x200 diagonal matrix that consists of the diagonals A
> and B.
>
> -Nathan
Thnx Nathan
But this create a matrix with diagonal elements in block form, i want that the diagonal elements from 1 to 6, to have the value of the diagonal elements of first matrix and from 6 to 200 the diagonal elements of the second matrix, just the diagonal elements and the other there will be zero. in total this matrix will be 200x200.
From: Matt Fig on 7 Apr 2010 19:46
% Data
A = diag(rand(1,2))
B = diag(rand(1,4))

% Engine
C = diag([diag(A),diag(B)]) % Also could index by A(1:size(A,1)+1:end)
From: Sean on 8 Apr 2010 08:17
"dafina " <d.xhako(a)gmail.com> wrote in message <hpj38j$h12$1(a)fred.mathworks.com>...
> How can I merge two diagonal matrix in matlab wtih different dimensions, for example the first one is 6x6 and dhe second is 194x194, in one that is 200x200

a = magic(6)
b = magic(20)

c = [a zeros(size(a,1),size(b,2));
zeros(size(a,1),size(b,2))' b]
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