How do I randomize a sequence of random numbers?

Hi,

I've created a random sequence of numbers as shown below, but right now it just repeats the first 8 random numbers 13 times. How can I get it so that each sequence of 8 numbers is truly random from the next?

        a = randi([1 4]);
        b = randi([1 4]);
        c = randi([1 4]);
        d = randi([1 4]);
        
        ASRTT = ([1 (a) 2 (b) 3 (c) 4 (d)]);
       
        seqVectorX = repmat(ASRTT,1,13)';

Here's an example of the first two sequences for reference, where you can see the first 8 numbers are just starting over:

1 3 2 4 3 4 4 4 1 3 2 4 3 4 4 4

I added the line below but then it just scrambled all the numbers and didn't keep the ASRTT seqence of 1, random number, 2, random number, 3, random number, 4, random number.

seqVectorX= seqVectorX(randperm(numel(seqVectorX)));

Thanks in advance for any advice!

Answer 1

[Shunichi Kusano]

repmat just repeats the input matrix. So, for what you want, the repeated matrix must change. I think the easiest way is like:

seqVectorX = [];
for i = 1:13
    a = randi([1 4]);
    b = randi([1 4]);
    c = randi([1 4]);
    d = randi([1 4]);
    
    ASRTT = ([1 (a) 2 (b) 3 (c) 4 (d)]);
    
    seqVectorX = [seqVectorX ASRTT];
end

And the next example makes the random numbers at first, then they are inserted to numbers in order.

v1 = repmat([1 2 3 4], 1, 13);
v2 = randi([1 4], 1,4*13); % random numbers

seqVectorX = reshape(cat(1,v1,v2),1,4*13*2);

Does this meet the objective?

[Maria Y]

Perfect - thank you so much!