Simple simulation of stock price

I am new with MATLAB. Could you help out with simulating X amount of what is inside the loop?

r = 0.02;
sigma = .2;
S_0 = 10;
dt = 1/4000;
wp = sqrt(dt);  
S_1 = S_0*(1+r*dt+sigma*wp*normrnd(0,1));  
for i = 1:1000   
    S_1 = S_1*(1+r*dt+sigma*wp*normrnd(0,1));  
end  
disp(S_1)

[Image Analyst]

What do you mean by "X amount"? I don't see any variable X in the code either. And by "what is inside the loop" do you mean S_1? If X is some fraction, then X amount of S_1 is simply X*S_1.

See this link

Answer 1

[Kuifeng]

In the loop, does this answer to your question?

for i = 1:1000   
    S_1(i+1) = S_1(i)*(1+r*dt+sigma*wp*normrnd(0,1));  
end

[N/A]

Thanks, These three lines generate stock price after 1000 steps. I need to generate, for example, 10000 of these stock prices. Because, as I understand, your answer gives a vector with just the history of getting to that 1000th value. So, basically I need 10000 stock prices after 1000 steps.