Extracting square matrices from another matrix
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Hello,
I have a 7x273 matrix from which I want to extract 39 7x7 matrices to compute a product of matrix exponentials. For example: expm(A1*t)*expm(A2*t)*expm(A3*t)*....*expm(A39*t) where each matrix Ai has a size of 7x7. I can extract them individually but now I'm confused since I need a simultaneous extraction and multiplication. Any suggestions?
Thank you.
采纳的回答
% fake input data:
t = 0.3;
A = rand(7,273);
%
C = mat2cell(A,7,7*ones(1,39));
Z = expm(C{1}*t);
for k = 2:39
Z = Z*expm(C{k}*t);
end
更多回答（1 个）
Stalin Samuel
2015-11-27
t = 0.2;%for example
tet = rand(7,273);%your matrix
a1 = tet(:,1:7);
n1 = 1;
n2 = 7;
a1 = tet(:,n1:n2);
prdt = ones(size(a1));
for n = 1:38
prdt =prdt*expm(a1*t);%product
n1 = n2+1;
n2 = n2+7;
a1 = tet(:,n1:n2);
end
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