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calculate the PMF of y (sum of three dices) and plot it
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Hello
I pretty confused about how to calculate the PMF of sum of three dices (represented by y such as 3,4,5...18) and how to plot its PMF using Matlab.
I feel like we need to use hist function but have no idea where to start. Hope someone can help me figure out!
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Accepted Answer
Image Analyst
on 29 Oct 2021
Not sure what PMF is. Did you ever actually try histogram()?
numRolls = 1000000;
numDice = 3;
dieFaces = randi([1, 6], numRolls, numDice);
theSums = sum(dieFaces, 2);
histObject = histogram(theSums, 'Normalization','pdf')
grid on;
xlabel('Sums');
ylabel('PDF')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/782648/image.png)
7 Comments
Paul
on 31 Oct 2021
One you know the PMF, for example from the Values of histObject above, the function
doc cumsum
would be of interest for computing the CDF. The functions
doc stem
doc stairs
would be of interest for plotting the CDF.
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