Hi There,
I have a 32 x 3 matrix as follows:
A =
[ 1 1 1;
1 1 2;
1 1 3;
1 1 4;
1 1 5;
1 1 6;
1 1 7;
1 1 8;
1 2 1;
1 2 2;
1 2 3;
1 2 4;
1 2 5;
1 2 6;
1 2 7;
1 2 8;
2 1 1;
2 1 2;
2 1 3;
2 1 4;
2 1 5;
2 1 6;
2 1 7;
2 1 8;
2 2 1;
2 2 2;
2 2 3;
2 2 4;
2 2 5;
2 2 6;
2 2 7;
2 2 8]
What I need to do is randomise the order of the rows, while keeping the row values together, however, this needs to be constrained such that for A(:, 4), every 8 rows contain only the numbers 1 - 8. So for example, you could have something like:
A(1:8, :) =
[ 1 2 4;
1 1 5;
2 1 6;
1 1 8;
2 2 1;
2 1 2;
2 1 7;
1 1 3]
The occurrence of 1 and 2 in the first two columns needs to be random, 1 - 8 needs to be randomised for every 8 values of the third column. Initially I tried to use the function randswap within a loop with an added constraint, but this has only led to an infinite loop. Also important that the rows stay together as the 1s and 2s in the first two columns need to appear alongside the last column an equal number of times. Pretty stumped. Any help much appreciated.