How to find probability mass function

Good afternoon, I'm trying to use the finitepmf function to find the probability mass function. However, the current version of matlab doesn't have the finitepmf. Can anyone send me an example of an alternative way to solve pmf so i can get example 5.26 working?

Answer 1

[Elias Tiso]

I had the same problem. I found a function definition for finitepmf() within this document:

http://homes.ieu.edu.tr/tince/Math218_MATLAB_examples.pdf

function pmf=finitepmf(sx,px,x)

% finite random variable X:

% vector sx of sample space

% elements {sx(1),sx(2), ...}

% vector px of probabilities

% px(i)=P[X=sx(i)]

% Output is the vector

% pmf: pmf(i)=P[X=x(i)]

pmf=zeros(size(x(:)));

for i=1:length(x)

pmf(i)= sum(px(find(sx==x(i))));

end

end

[Jehan Alsulaiman]

I get an error on mf=zeros(size(x(:)));

it says not enough arguments

'Not enough input arguments.'