How can I ensure no repeated adjecent values in a vector?

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Juan Sanchez 2018-6-25

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评论： Juan Sanchez 2018-6-25

Hello I've created a code in wich I generate an array of 52 values randomly of 1s and 2s with an 85% prob for 1s and 15% for 2s (approximately). Now I need to reorganize them in a way were I wont have 2s adjecent and at least two 1s before the next 2. to give you a better idea its this sequence: "1 1 1 1 2 1 1 1 1 2 1 1 1 2 1 1 1 1 2 1 1 2.....". This is to create an audio output for 1s and 2s. That means if x=1 the play A and X=2 Play B. Thats the idea behind it but I really need help with the second part.

My code is:

   trials=[]
for i=1:5000;
    test = rand_trial(0.85,52);  % rand_trial is a function I made apart works fine
    tbl = tabulate(test);
    if tbl(1,2) == 44;  % This is ne number of 1s I need for the trial
        trials = test;
        break
    end
end

I would be most grateful for any help or advice.

Thanks in Advance

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Answer 1

Guillaume 2018-6-25

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在 MATLAB Online 中打开

This is how I'd do it:

while true   %run until we get an acceptable sequence. break will quit the loop
   test = (randperm(52) > 44) + 1;  %create a random permutation of 44 1s and 8 2s
   if min(diff(find(test == 2))) > 3   %minimum distance between 2s is 3
       break;
   end
end

Note: rather than creating a distribution that has an 85% probability of 1s and then checking that there are exactly 44 1s, I just directly create a random permutation of 44 1s out of 52. In my opinion, it makes more sense.