MATLAB: Plot the same function several times in one go (Random walk)

for looprandom walk

 clear
 clc
==================
 N = 10; % number of steps.
 M = 10;
 x_t(1) = 0;
    for n = 1:N
        a = sign(randn);
        x_t(n+1) = x_t(n) + a;
    end
plot(x_t);
xlabel('t'), ylabel('x_t'), title('randomwalk');
Someone already helped me with this task but he rewrote the entire code as a means of vectorizing it, is there any way I could plot the same function several times while retaining the previous plot, without changing too much of my code? I'm not sure how to progress beyond this stage since it doesn't do anything when i implement
   hold on

Best Answer

You should always include a link to the old question, so people can look there for context. Of course it is always best to use vectorized code. It is a bad idea to refuse that kind of speed increasing measures. But if you are adamant about not using that other solution, just wrap this code in a for loop if you want to repeat it.
 clear variables
 clc
==================
 N = 10; % number of steps.
 M = 10;
 for m=1:M
 x_t(1) = 0;
    for n = 1:N
        a = sign(randn);
        x_t(n+1) = x_t(n) + a;
    end
 plot(x_t);hold on
 end
 xlabel('t'), ylabel('x_t'), title('randomwalk');
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