Repeating a random generator

Hi, I'm working on a genetic algorithm that has a finite state machine. In the problem, a chromosome of length 30 represents 10 states of a FSM where each state consists of 3 digits (or genes; hence total 30 genes).

In each state, the first gene contains an integer in 1-4 while the second and third genes should contain integers in 0-9.

I have successfully declared the first 3 genes (first state), however, how would I change the following so the random declaration repeats itself 10 times, as you can see the code is only doing it for the first 3 values

TempChromosomeTest = zeros(1,30);
for i=1:10
    firstState = randi([1, 4])
    TempChromosomeTest(1,1) = firstState;
    secondState = randi([0, 9])
    TempChromosomeTest(1,2) = secondState;
    thirdState = randi([0,9])
    TempChromosomeTest(1,3) = thirdState;
end

Answer 1

[Stephen23]

You do not need a loop, it is much faster to generate all of the random values at once and assign them using indexing:

>> TempChromosomeTest = zeros(1,30);
>> TempChromosomeTest(1:3:end) = randi([1,4],1,10); % firsts
>> TempChromosomeTest(2:3:end) = randi([0,9],1,10); % seconds
>> TempChromosomeTest(3:3:end) = randi([0,9],1,10); % thirds

And you can check them using indexing too:

>> TempChromosomeTest(1:3:end) % firsts
ans =
   3   1   1   4   2   1   3   1   3   1
>> TempChromosomeTest(2:3:end) % seconds
ans =
   9   8   4   3   9   1   2   3   7   4
>> TempChromosomeTest(3:3:end) % thirds
ans =
   6   6   0   2   4   0   2   4   2   7