Question

I have a challenge to order my matrix. The provided functions like sortrows work in the opposite way…

Take this 2D matrix

M =
     40    45    68
     50    65    58
     60    55    48
     57    67    44    
                      ,

The objective is to find matrix O that indicates the sorting index (rank) per row, i.e.:

O =

     1     2     3
     1     3     2
     3     2     1
     2     3     1
                       .

So for the second row 50 is the smallest element (1), 65 the largest (3), and 58 is the second largest (2), therefore row vector [1 3 2].

Answer 1

[~,sorted_inds] = sort(M,2);

will do.