Swaping two columns randomly picked

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Hi guys,
I would like to swap two columns randomly picked in an array. I wrote such a code and I would be glad if you could help me to find the error:
it's an array q with dimensions 25x5. Later I would like to create two another function for inserting one randomly picked column after the second randomly picked column, I would be thankful if you could check and help me.
function qnew = Swap(q)
n = w;
i=randsample(n,2) %randomly picking two columns
qnew([i1(:,i(1)) i2(:,i(2))])=q([i2(:,i(2)) i1(:,i(1))]);
Function definitions in a script must appear at the end of the file.
Move all statements after the "Swap" function definition to before the first local function definition.

Accepted Answer

Torsten on 17 May 2022
Edited: Torsten on 17 May 2022
A = rand(25,5);
i = randsample(5,2);
v = A(:,i(1));
A(:,i(1)) = A(:,i(2));
A(:,i(2)) = v;
or simply
A = rand(25,5);
i = randsample(5,2);
A(:,[i(1) i(2)]) = A(:,[i(2) i(1)]);
  1 Comment
Bartosz Bagrowski
Bartosz Bagrowski on 17 May 2022
Thanks, it helped me a lot! And do you have maybe an idea how to insert one randomly picked column after another one randomly picked?

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