How to create a matrix with matrices as elements? where the matrix A contains symbolic variables
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Sarala Gurijala
am 14 Mai 2022
Kommentiert: Voss
am 19 Mai 2022
3 Kommentare
dpb
am 14 Mai 2022
Bearbeitet: dpb
am 15 Mai 2022
Pretty much just write the terms in an array - the products are all 1x1 so the summations are as well.
You'll have to define what P is and have a routine that computes the number of terms to fill in the right number of zeros -- and it's certainly not unambiguous what might be the intermediary ... terms going from third row to last. It may be possible to infer from the context from which this was extracted, but not on its own.
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Voss
am 14 Mai 2022
It may be useful to see the fact that, for matrices A, B, and C of the given sizes, the products C*B, C*A*B, C*A^2*B, etc., are all scalars, so any sum of those products is a scalar. Therefore, all those expressions are actually scalars, so it's not in fact a matrix of matrices like it seems to be at first glance.
Each of those scalars can be calculated in a for loop to perform the summation:
A = [1 2; 3 4];
B = [1; 2];
C = [1 2];
p = 7;
m = 5;
M = zeros(p,m);
for kk = 1:p % loop over rows
for jj = 1:m % loop over columns
for ii = 0:kk-jj % summation loop for element kk,jj
% note that kk<jj gives "for i = []", so this loop doesn't
% execute when kk<jj, and M(kk,jj) remains at 0.
% kk<jj corresponds to the upper triangular part of M,
% which should be all zeros, so that works out nicely.
M(kk,jj) = M(kk,jj) + C*A^ii*B;
end
end
end
M
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