Programming

Sorting the Data in Each Row

Sort each row of A in descending order. Note that issorted tests for an ascending sequence. You can flip the vector to test for a sorted descending sequence:

• r = sort(A, 2, 'descend')
  r =
      9.5013    7.6210    6.1543    4.0571    0.5789
      9.3547    7.9194    4.5647    3.5287    2.3114
      9.2181    9.1690    8.1317    6.0684    0.1850
  
  issorted(fliplr(r(1, :)))
  ans =
       1
  

When you specify a second output, sort returns the indices of the original matrix A positioned in the order they appear in the output matrix. In the following example, the second row of index contains the sequence 4 3 2 5 1, which means that the sorted elements in output matrix r were taken from A(2,4), A(2,3), A(2,2), A(2,5), and A(2,1):

• [r index] = sort(A, 2, 'descend');
  index
  index =
       1     2     3     4     5
       4     3     2     5     1
       3     4     5     1     2
  

Sorting the Data in Each Column

Sorting Row Vectors

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