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

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)

[Walter Roberson]

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]

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

Answer 1

[Steve]

 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)

We'll you could make x or y an array with x{i} and y{i}.

[Walter Roberson]

I doubt the intent is to check the standard deviation of the random numbers.