MATLAB: How to randomly exchange 2 entries in a column

arraycolumnexchange elements

Hi, I have
a=[ 1 2;
    3 4;
    2 1;
    4 5;
    5 3]
I want to choose randomly any 2 entries from a column and exchange them. For example, I randomly choose entries 2 and 5 from the second column, exchange these two entries to become
 b=[  1 5;
      3 4;
      2 1;
      4 2;
      5 3]
How am I going to make this? Thanks in advance.

Best Answer

This seems to work:
[r,c] = size(a);                    % ‘a’ Row, Col Size
cc = randi(c);                      % Choose Random Column
rc = randi(r, 1, 2);                % Choose Random Rows
b = a;                              % Create ‘b’
b(rc,cc) = a(fliplr(rc), cc)        % Swap Rows of Chosen Column
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