How do I plot two functions at the same time

Hi I am having a hard time plotting two functions at the same time and showing all the points.

This is the question I am trying to figure out.

The variance of a Bernoulli random variable is p(1 − p). Use a for loop, the var function, and your Bernoulli random variable generator to do the following: Vary p from 0 to 1 in steps of 0.05. For each value of p generate 1000 Bernoulli random variables and use the var command to compute the variance at each p value. Create figure(1) and plot your result along with the function p(1 − p) (on the same figure). Use the ’o’ marker for the points you calculated from your Bernoulli random variable generator and a black line for the curve p(1−p). Label the x-axis as ‘p’ and the y-axis as ‘variance’

This is what I have so far.

myBern=@(n,m,p)double(rand(n,m)<p)

myVar=@(p)p(1-p) plot(p,myVar(p)) n = 1; m = 1000;

for p=0:.05:1 myVar=@(p)p(1-p); x = myBern(n,m,p); disp('Variance') disp(var(x)) plot(p,var(x),'o')

end

The issues I am having are when I try to run this script for plot(p,myVar(p)) I keep getting the error "Subscript indices must either be real positive integers or logicals."

Error in @(p)p(1-p)

and in plot(p,var(x),'o') It is only plotting one point and I am not sure how to get it to plot the variance for all the points of p in the for loop.

I am also not really sure how to get the x-axis and the y-axis to stay labeled every time I run the code.

Any help or suggestions will be appreciated.

Answer 1

[KSSV]

you p is taking value 0, how o can be a index? 0 cannot be a index. it Shall start with 1. You mat do the following: P = 0:0.05:1 ; Run another loop like;

for i = 1:length(p)

p = P(i) ;

end

Use this p where you want.