How can I create a custom probability distribution?

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L'O.G. 2022-2-18

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回答： Paul 2022-2-18

I want to define a custom discrete probability mass function. Can I do this using `makedist` or perhaps some other function, if so how?

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Answer 1

Paul 2022-2-18

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Check out the doc page for distributionFitter and the associated Distribution Fitter app. Despite the name, the app can be used to define a custom distribution that you can subsequently use to create objects of that distribution.

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Answer 2

David Hill 2022-2-18

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编辑：David Hill 2022-2-18

在 MATLAB Online 中打开

p = [0.2 0.3 0.5];%probabilities
v = [3 7 10];%discrete values
% P(X=3)=0.2, P(X=7)=0.3 and P(X=10)=0.5 Probability Mass Function
n = 10000;%number of samples
c = cumsum([0,p(:).']);
c = c/c(end);%ensure cumulative is 1
[~,i] = histc(rand(1,n),c);
r = v(i);%map, generates n samples with the probability mass function provided

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L'O.G. 2022-2-18

编辑：L'O.G. 2022-2-18

Thanks, but I don't think that's quite it. I guess I was unclear. Perhaps I should've said: I'd like to create a custom probability distribution object. I'd like to do that to be able to define a discrete pmf. That's why modifying makedist sounds like a possibility.

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