MATLAB Programming

Shifting and Sorting Matrices
Sorting the Data in Each Column
The sort function sorts matrix elements along a specified dimension. The
syntax for the function is
sort(matrix, dimension)
To sort the columns of a matrix, specify 1 as the dimension argument. To sort
along rows, specify dimension as 2.
This example first constructs a 6-by-7 random matrix:
rand('state', 0); % Initialize random number generator
A = floor(rand(6,7) * 100);
A =
95 45 92 41 13 1 84
23 1 73 89 20 74 52
60 82 17 5 19 44 20
48 44 40 35 60 93 67
89 61 93 81 27 46 83
76 79 91 0 19 41 1
Sort each column of A in ascending order:
c = sort(A, 1)
c =
23 1 17 0 13 1 1
48 44 40 5 19 41 20
60 45 73 35 19 44 52
76 61 91 41 20 46 67
89 79 92 81 27 74 83
95 82 93 89 60 93 84
issorted(c(:, 1))
ans =
1
Sorting the Data in Each Row
Use issorted to sort data in each row. Using the example above, if you sort
each row of A in descending order, issorted tests for an ascending sequence.
You can flip the vector to test for a sorted descending sequence:
1-39