MATLAB: Randomization problem. Is it complicated

rand

Hi all,

A question regarding the randomization with Matlab: I have created a script where I have 12 images and 12 sounds, combined into 24 trials. 1-1 1-2 2-1 2-2 3-3 3-4 4-3 4-4 And so on…. The script works very well and no bugs with psychtoolbox.

Any idea of how to randomise those 24 trials while avoiding 2 consecutive trials? For instance, randomise and avoid 3-4 and 4-4 or 4-3 to occur one after the other.

Looking forward for an answer 🙂

Many thanks!

Best Answer

For something like this, the easiest way is to loop, generating potential orders, exiting the loop if the order is acceptable and otherwise continuing to loop.

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MATLAB: How to replace half the number of specific element in an array

To change random columns:

>> A=[1 2 3 4 4 1 2 4 4 3 4 4 4 2 1 3 4 4 4 2 1 4 4]
A =
   1   2   3   4   4   1   2   4   4   3   4   4   4   2   1   3   4   4   4   2   1   4   4
>> nnz(A==4)
ans =  12
>> idx = find(A==4);
>> num = numel(idx);
>> A(idx(randperm(num,ceil(num/2)))) = 2
A =
   1   2   3   2   2   1   2   4   4   3   2   4   2   2   1   3   2   4   4   2   1   2   4
>> nnz(A==4)
ans =  6

MATLAB: How to create a random integernumbers with conditions

ix = [4, 3, 3];
A = repelem(1:3, ix);
A(randperm(numel(A)))

Best Answer

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MATLAB: How to replace half the number of specific element in an array

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