Code for Multiple Matrix Multiplication

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Prasanna Venkatesh
Prasanna Venkatesh 2019-6-14
评论： Prasanna Venkatesh 2019-6-14
I have 'n' number of two dimensional(square) matrices. I have stored them as stack in a single three dimensional matrix. How can I perform series of matrix multiplication from 1 to n matrices without explicitly writing the whole line?
n=3;
a,b,c; % Three 2d matrices with same dimension
T(:,:,1) = a;
T(:,:,2) = b;
T(:,:,3) = c;
ans = T(:,:,1)*T(:,:,2)*T(:,:,3);% Explicitly performing matrix multiplication

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采纳的回答

Stephen23
Stephen23 2019-6-14
编辑：Stephen23 2019-6-14
>> T=randi(9,4,4,3); % fake data
>> T(:,:,1)*T(:,:,2)*T(:,:,3) % your approach
ans =
2359 1398 2072 2154
1788 1103 1625 1734
1731 1137 1653 1808
2154 1282 1849 1995
>> M=1; for k=1:size(T,3), M=M*T(:,:,k); end % simple loop
>> M
M =
2359 1398 2072 2154
1788 1103 1625 1734
1731 1137 1653 1808
2154 1282 1849 1995

更多回答（1 个）

madhan ravi
madhan ravi 2019-6-14
RR = cell(1,size(T,3)-1); % where T is your 3D matrix
RR{1} = T(:,:,1)*T(:,:,2);
for k = 2:size(T,3)-1
RR{k} = RR{k-1} * T(:,:,k+1);
end
Wanted = RR{end}

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