CODEWITHSUNDEEP
matlab
user1346841
user1346841

Reputation:

Shuffle column pairs

I have an array with two columns and each row is a unique pair. When I shuffle, I want the array to be shuffled among pairs, not as two separate columns.

This is the array 

A=[2     1;
   2     1;
   2     2;
   2     2;
   2     3;
   2     3;
   2     4;
   2     4;
   1     5;
   1     6;
   1     7;
   1     8;
   1     9;
   1     9;
   1     9;
   1     9]

So after the shuffling, I want the pairs to be preserved, only their ordering can change.

Upvotes: 0

Views: 666

Answers (1)

Richante
Richante

Reputation: 4388

So size(A) = [16, 2] and you want to shuffle the rows without disturbing the pairs. Try:

A = A(randperm(16), :);

randperm(16) gives the numbers 1..16 in a random order, and these are used to index the rows of A.

Upvotes: 4

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