Probability of Combinations Occurring

Question

Mary Evans 2020-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/598771-probability-of-combinations-occurring

编辑： the cyclist 2020-9-23

I have a 10000x2 double and I want to find all unique combinations and output the probabilty that each combination occurs. How would I go about this?

Thank you

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Answer 1

the cyclist 2020-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/598771-probability-of-combinations-occurring#answer_499354

编辑：the cyclist 2020-9-23

By "unique combinations", I assume you mean unique rows.

Here is one way:

% Example dataset. (Use your data instead.)
x = [7 8;
     1 3;
     7 8;
     1 2;
     1 3;
     1 3];
[uniqueRows,idxToUnique,idxFromUniqueBackToInput] = unique(x,'row','stable');
probabilityOfUniqueRows = histcounts(idxFromUniqueBackToInput,[1:max(idxFromUniqueBackToInput) Inf],'normalization','probability');