How to do matrix or table multiplication?

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raghavendra kandukuri
评论： raghavendra kandukuri 2019-9-6
Hi,
I have this two tables or matrix, where i am looking to perform the addition of 1st element in the first matrix of first row with the all element in the first row of second matrix and similarly with the second element in the first matrix of first row with the all the elements of first row in second matrix. Similarly with the second and third row elements.
Is there any easy way or formula to do this? even if the size of the matrix changes
Example:
IntakeTable = [0 3 2
4 2 2
4 4 4 ];
ExhaustTable = [0 3 2
4 2 2
2 2 2 ];
resultTable =[0+0 0+3 0+2 3+0 3+3 3+2 2+0 2+3 2+2
4+4 4+2 4+2 2+4 2+2 2+2 2+4 2+2 2+2
4+2 4+2 4+2 4+2 4+2 4+2 4+2 4+2 4+2]

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采纳的回答

Walter Roberson
Walter Roberson 2019-9-6
resultTable = kron(IntakeTable,ones(1,size(ExhaustTable,2))) + repmat(ExhaustTable,1,size(IntakeTable,2));

更多回答（2 个）

Bjorn Gustavsson
Bjorn Gustavsson 2019-9-6
Looping seems simplest and most easily readable for humans:
szI = size(IntakeTable);
szE = size(ExhaustTable);
resultTable = zeros(size(ExhaustTable,1),size(ExhaustTable,2)*size(IntakeTable))
for i1 = 1:szI(2),
resultTable(:,(1:szE,2)+(i1-1)*szE(2)) = repmat(IntakeTable(:,i1),1,szE(2)) + ...
ExhaustTable;
end
HTH
Adam Danz
Adam Danz 2019-9-6
编辑：Adam Danz 2019-9-6
resultTable = repmat(ExhaustTable,1,3) + repelem(IntakeTable,1,3)
Or, if the number of columns vary,
resultTable = repmat(ExhaustTable,1,size(IntakeTable,2)) + repelem(IntakeTable,1,size(ExhaustTable,2))

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