How to randomly exchange 2 entries in a column?

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Grace
Grace 2014-10-1
回答： Star Strider 2014-10-1
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.

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Star Strider
Star Strider 2014-10-1
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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