Question

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Sort a matrix with another matrix

The Matrix A (’10 x 1000′ all numbers) look like this:

score(1.1) score(1.2) score(1.3)….score(1.1000)

score(2.1) score(2.2) score(2.3)….score(1.1000)

…

The Matrix B (‘1 x 1000’ all numbers):

Return(1) Return(2) Return(3) …..Return(1.1000)

Every time I sort a row of Matrix A, I want to sort Matrix B based on the order of the sorted row in Matrix A. Because there are 10 rows in Matrix A, Matrix B will be sorted 10 times and generate a new Matrix C (’10 x 1000′) like this: (I am looking for a script to generate this Matrix C)

Return(3) Return(25) Return(600) …….Return(1000)

Return(36）Return(123) Return(2)……..Return(212)

….
….

Answer 1

This should do what you want:

A = randn(10,1000);
B = randn(1,1000);
C = zeros(size(A));

for i = 1:10
    [a idx] = sort(A(1,:));
    A(i,:) = a;
    C(i,:) = B(idx);
end

Now the rows of A are sorted, and the rows of C contain the corresponding sorted B.