How to find probability mass function

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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?

Accepted Answer

Elias Tiso
Elias Tiso on 28 Oct 2020
I had the same problem. I found a function definition for finitepmf() within this document:
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
  1 Comment
Jehan Alsulaiman
Jehan Alsulaiman on 17 Oct 2021
I get an error on mf=zeros(size(x(:)));
it says not enough arguments
'Not enough input arguments.'

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