How to operate block matrices?
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I'd like to operate matrix in which each element is composed by two numbers. For instance,
If I have a matrix B=[1,2; 3,4] for instance, I'd like to have
Someone have some idea?
Thank you!
采纳的回答
Rik
2022-10-7
1 个投票
You will have to store your matrix as a 3-D matrix. Even if pagemtimes is not what you want, that will make it easier to write a loop to apply the operation you do want.
2 个评论
Noemi ZM
2022-10-7
Image Analyst
2022-10-7
Can you explain exactly what was multiplied by what, and summed, to get the output matrixes?
更多回答（1 个）
One can always store block matrices in cell arrays and then roll code to implement the block matrix algebra. Maybe there is a submittal on the FEX for a block matrix class?
A = {[1 2] , [3 4]; [3 5] , [4 2]};
B = {1 , 2; 3, 4};
C = blockmtimes(B,A)
function C = blockmtimes(A,B)
[m,n] = size(A);
[n,s] = size(B);
for ii = 1:m
for jj = 1:n
C{ii,jj} = zeros(size(A{ii,jj},1),size(B{ii,jj},2));
for kk = 1:n
C{ii,jj} = C{ii,jj} + A{ii,kk}*B{kk,jj};
end
end
end
end
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