Max value of row in matrix and creating new matrix
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I want something like this matrixa=[12 33 44;26 59 14;15 99 54] matrixb=[26 89 95;23 54 12;2 54 43]
and to get output like this
matrixc=[15 99 54;26 89 95]
calculate the sum of rows in both matrix and to create a new matrix with the two rows that have the greatest sum value like example above. can it be done with max function ? thanks in advance :)
回答（2 个）
Star Strider
2014-10-7
This works:
sa = sum(matrixa,2);
sb = sum(matrixb,2);
c = zeros(size(matrixa));
q1 = matrixa(sa > sb,:);
q2 = matrixb(sb > sa,:);
c(sa > sb,:) = matrixa(sa > sb,:);
c(sb > sa,:) = matrixb(sb > sa,:);
3 个评论
Etan Cole
2014-10-7
Star Strider
2014-10-7
Misread it at first. This works:
sa = sum(matrixa,2);
sb = sum(matrixb,2);
mab = [matrixa; matrixb];
sab = [sa; sb];
[srtab,ix] = sort(sab,'descend');
matrixc = mab(ix(1:2),:);
Star Strider
2014-10-8
With respect to your solution, what happens if the two largest row sums happen to be in the same matrix?
My code accounts for that, so that ‘c’ contains the rows of either matrix with the largest row sums.
Your code selects the largest row sums from ‘matrixa’ and ‘matrixb’. They may not be the largest row sums of the two matrices.
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2014-10-8
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