Toeplitz Matrix Generation from 2 MATRICES
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Saleh Msaddi
el 18 de Mayo de 2020
Hello Everyone,
I know we can define a row and column vector then use the toeplitz function to generate a toeplitz matrix, but how can I do that when I have two matrices instead of vectors?
Suppose I have matrices A and B, and I want to generate a toeplitz matrix such that;
T = [B 0 0 ... 0;
A*B B 0 ... 0;
A^2*B A*B B ... 0;
. . . ... .
. . . ... .
A^(n-1)*B A^(n-2)*B . ... B];
size(A) is KxK
size(B) is KxM
2 comentarios
Stephen23
el 18 de Mayo de 2020
@Saleh Msaddi: just to be sure: each of those * is an actual matrix multiply?
So the output T will have size (n+1)*K x (n+1)*M ?
Respuesta aceptada
Stephen23
el 18 de Mayo de 2020
Editada: Stephen23
el 18 de Mayo de 2020
>> A = rand(3,3);
>> B = rand(3,5);
>> N = 4;
>> F = @(n)(A^n)*B;
>> C = arrayfun(F,0:N,'uni',0);
>> C = [{zeros(size(B))},C];
>> X = 1+tril(1+toeplitz(0:N));
>> M = cell2mat(C(X))
M =
0.69956 0.86686 0.20666 0.46757 0.94893 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
0.46328 0.36229 0.56426 0.85822 0.71207 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
0.77021 0.83655 0.31248 0.91479 0.48724 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.04535 1.08015 0.66586 1.30393 1.19787 0.69956 0.86686 0.20666 0.46757 0.94893 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.19151 1.33153 0.52492 1.24584 1.20115 0.46328 0.36229 0.56426 0.85822 0.71207 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.13782 1.29286 0.44387 1.14332 1.08196 0.77021 0.83655 0.31248 0.91479 0.48724 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.92239 2.11932 0.91061 2.08183 1.97011 1.04535 1.08015 0.66586 1.30393 1.19787 0.69956 0.86686 0.20666 0.46757 0.94893 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.89463 2.07432 0.92888 2.08761 1.95665 1.19151 1.33153 0.52492 1.24584 1.20115 0.46328 0.36229 0.56426 0.85822 0.71207 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
1.73168 1.89633 0.84706 1.90766 1.78390 1.13782 1.29286 0.44387 1.14332 1.08196 0.77021 0.83655 0.31248 0.91479 0.48724 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000 0.00000
3.13506 3.43921 1.52166 3.43777 3.22857 1.92239 2.11932 0.91061 2.08183 1.97011 1.04535 1.08015 0.66586 1.30393 1.19787 0.69956 0.86686 0.20666 0.46757 0.94893 0.00000 0.00000 0.00000 0.00000 0.00000
3.12822 3.43513 1.51057 3.42191 3.21683 1.89463 2.07432 0.92888 2.08761 1.95665 1.19151 1.33153 0.52492 1.24584 1.20115 0.46328 0.36229 0.56426 0.85822 0.71207 0.00000 0.00000 0.00000 0.00000 0.00000
2.85612 3.13678 1.37809 3.12326 2.93605 1.73168 1.89633 0.84706 1.90766 1.78390 1.13782 1.29286 0.44387 1.14332 1.08196 0.77021 0.83655 0.31248 0.91479 0.48724 0.00000 0.00000 0.00000 0.00000 0.00000
5.15716 5.66180 2.49328 5.64461 5.30487 3.13506 3.43921 1.52166 3.43777 3.22857 1.92239 2.11932 0.91061 2.08183 1.97011 1.04535 1.08015 0.66586 1.30393 1.19787 0.69956 0.86686 0.20666 0.46757 0.94893
5.13621 5.63814 2.48462 5.62330 5.28412 3.12822 3.43513 1.51057 3.42191 3.21683 1.89463 2.07432 0.92888 2.08761 1.95665 1.19151 1.33153 0.52492 1.24584 1.20115 0.46328 0.36229 0.56426 0.85822 0.71207
4.68804 5.14614 2.26789 5.13272 4.82305 2.85612 3.13678 1.37809 3.12326 2.93605 1.73168 1.89633 0.84706 1.90766 1.78390 1.13782 1.29286 0.44387 1.14332 1.08196 0.77021 0.83655 0.31248 0.91479 0.48724
And checking:
>> B % equal to main diagonal (e.g. top left corner and bottom right corner):
B =
0.69956 0.86686 0.20666 0.46757 0.94893
0.46328 0.36229 0.56426 0.85822 0.71207
0.77021 0.83655 0.31248 0.91479 0.48724
>> A^N*B % equal to bottom left corner
ans =
5.1572 5.6618 2.4933 5.6446 5.3049
5.1362 5.6381 2.4846 5.6233 5.2841
4.6880 5.1461 2.2679 5.1327 4.8230
4 comentarios
Stephen23
el 18 de Mayo de 2020
Editada: Stephen23
el 18 de Mayo de 2020
"...the size of M is (n*K) x (n*M) and size of R is (n*k) x (r*M), right?"
As far as I can tell those are the output sizes.
But you don't need to ask me: simply try the code on a few random input matrices of different sizes, with a few r and N values, and you can check the output sizes for yourself. Or you can reverse engineer the code and confirm that it does what you want (take it apart, figure out how it works, check the output of each line).
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