Incorrect output of sortrows function

Hi everyone,

Sortrows function seems to return incorrect arranged array, here is very specfice example.

A = [110.359026830732,-23.6025085449219,2.30662154653535; ...
     110.359026830732,-23.6025085449219,2.93833414713542; ...
     110.359026830732,-23.6025085449219,2.30662154653535]

In array A, the first and last point is the same and should be returned in position 1 and 2. But point 3 will be returned in position 3. However, output is not correct as below:

B = sortrows(A,[1 2],{'ascend','ascend'})

>> B =

  110.3590  -23.6025    2.3066
  110.3590  -23.6025    2.9383
  110.3590  -23.6025    2.3066
  

Checking if the rows 1 and 3 are same:

  A(1,:) == A(3,:)

ans =

  1×3 logical array

   1   1   1
   

Is it because I am using the double array format? any help will be appreciated.

Thank you

Answer 1

[David Hill]

B=sortrows(A);%if you just sort based on columns [1 2] no sorting will happen since then are all equal

[Hamdan Almusaibeli]

Hi David,

Thank you so much for the prompt response. Appreciate your answer.

That makes sense.