How to detect equal rows of a matrix compare with another matrix with a 10 per cent of margin?

Question

Manuel Ignacio 2013-2-6

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/62450-how-to-detect-equal-rows-of-a-matrix-compare-with-another-matrix-with-a-10-per-cent-of-margin

I have a matrix and I want to compare rows of this matrix to rows of another matrix and verify if there are rows wich match them.

For example:

A = 1 2 3; 4 5 6; 7 8 9

B = 54 23 13; 54 32 12; 1.1 2.2 2.9

I need to detect that row 1 of the Matrix A match with the row 3 of the Matrix B. The rows are not equal because I want a +-10 per cent of margin.

Thank you very much.

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Answer 1

ChristianW 2013-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/62450-how-to-detect-equal-rows-of-a-matrix-compare-with-another-matrix-with-a-10-per-cent-of-margin#answer_74009

在 MATLAB Online 中打开

m = 0.1; % margin
A = [1 2 3; 4 5 6; 7 8 9];
B = [7 8 10; 4 5 12; 1.1 2.2 2.9; 1.101 2 3; 6.3 7.2 9.9];
k = 0;
for i = 1:size(A,1)
    for j = 1:size(B,1)
        if all(abs((A(i,:)-B(j,:))./A(i,:)) <= m+eps)
            k = k+1;
            match(:,k) = [i;j]; %#ok<SAGROW>
        end
    end
end
fprintf('A row %d matches B row %d.\n',match)