FInd the distribution of some random numbers

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abc abc 2016-4-17

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回答： Image Analyst 2016-4-17

Hi everybody, i have some random numbers and i would like to know what is the distribution associated with it ? Is it possible to represent it to know the density of probabilities of it ?

thanks :)

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Answer 1

Jos (10584) 2016-4-17

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There are so many distributions that you have to make some choices. First, look at the distribution of your numbers and, by sheer logic, select a few candidates (beta, poisson, normal, ...). Then try to fit them.

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abc abc 2016-4-17

Yeah you're right but actually i generated my random numbers by C++. How can i look at the distribution of my number with Matlab ?

Jos (10584) 2016-4-17

make a histogram

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Answer 2

Image Analyst 2016-4-17

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在 MATLAB Online 中打开

For the actual distribution, use histogram():

histObject = histogram(yourData(:));

You can also use hist(), histc(), histcounts(), or imhist() depending on exactly what you want to do.

For a theoretical fit, use fitdist(), if you have the Statistics and Machine Learning Toolbox and you know the distribution you want to fit your data to. From the help:

pd = fitdist(x,distname) creates a probability distribution object by fitting the distribution specified by distname to the data in column vector x.