How do you store values in an array to use for Standard Devation?

Question

Richar Aguilar 2013-4-25

0
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关闭： MATLAB Answer Bot 2021-8-20

So, I'm taking a computational physics course using the MATLAB software and in one of my assignments I have to approximate pi using a Monte Carlo integration an then get the standard deviation form those values.

My professor said I had to use an array or something so that I can use the standard deviation function of MATLAB. Thing is...I have no idea how to go about doing it. Any ideas? This is my code so far...

 function MC_circle = MC_circle(N_points)
 count = 0; 
 r = 1; 
 for i=1:N_points;
    x = rand(1);
    y = rand(1);
    if (sqrt(x^2 + y^2) < 1);
    count = count + 1; 
    end
 end
Pi = (4*count)/(N_points)

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Walter Roberson 2013-4-26

You have not set your function return value MC_circle .

The standard deviation of what is to be calculated ? My guess is that you are intended to run this loop a number of times and calculate the standard deviation of all of the various Pi that result. Is that the case?

Richar Aguilar 2013-4-26

Yes, indeed! I want to calculate the standard deviation of all the Pi values that result.

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Answer 1

Steve 2013-4-26

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 function MC_circle = MC_circle(N_points)
 count = 0; 
 r = 1; 
 for i=1:N_points;
    x = rand(1);
    y = rand(1);
    if (sqrt(x^2 + y^2) < 1);
    count = count + 1; 
    end
 end
Pi = (4*count)/(N_points)