How to normalize random variables and the function of the random variable using a histogram?

Question

Sergio Campos 2017-10-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/363282-how-to-normalize-random-variables-and-the-function-of-the-random-variable-using-a-histogram

回答： Sonam Gupta 2017-11-6

I have a constantly changing random variable that contributes to producing an output. Here is the code:

 r = []; %set vector r to be zero
v = 10; %set muzzle velocity to 10 m/s
g = 9.81; %set gravity to 9.81 m/s^2
for i=1:1:iterations
theta = (pi/2)*rand; %creates RV theta to be between 0 and pi/2
r(i) = 2*sin(theta)*cos(theta)*(v^2)/g;
RV_theta(i)=theta; %stores values of RV into variable
end

Now I know how to plot the normalized function and RV as a normal plot but I want the plot to be a histogram. How can I do this for both the RV theta and the output r to get the probability density function?