Why doesn't MATLAB plot?

stock = 100;
delta_t = 1 / 365;
volatility = 0.1;

for i = 1 : 5
    stock = stock .* exp( volatility .* sqrt ( delta_t ) .* randn(1) );
    disp( stock )
end

t = 1 : 5 plot(stock,t)

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Anyone could help please? Thank you

Tony

Answer 1

[Wayne King]

You are not assigning the output stock to a vector, so you are just getting the latest result from the for loop.

     stock = zeros(5,1);
     delta_t = 1 / 365;
     volatility = 0.1;
     initstock = 100;

    for ii = 1 : 5
        stock(ii) = initstock .* exp( volatility .* sqrt ( delta_t ) .* randn(1) );
        initstock = stock(ii);

    end
    t = 1:length(stock);
    plot(t,stock)

[Tiancong Sui]

Thank you !!!!! I started to use Matlab 2 days ago and this is the first task for me, thank you for your great help!

Answer 2

[Tiancong Sui]

stock = 100;

delta_t = 1 / 365;

volatility = 0.1;

for i = 1 : 5

stock = stock .* exp( volatility .* sqrt ( delta_t ) .* randn(1) );

disp( stock )

end

t = 1 : 5

plot(stock,t)

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A better version, the one above is crumbled up.

[Matthew Crema]

I'm guessing you want to save the value of stock in each iteration of the for loop. Try:

for i = 2 : 5
    stock(i) = stock(i-1) .* exp( volatility .* sqrt ( delta_t ) .* randn(1) );
    disp( stock )
end

[Tiancong Sui]

To Matthew, thank you! yes you are right, I was trying to do the iteration. Thanks you!