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Probability of Combinations Occurring

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Mary Evans
Mary Evans on 23 Sep 2020
Edited: the cyclist on 23 Sep 2020
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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Answers (1)

the cyclist
the cyclist on 23 Sep 2020
Edited: the cyclist on 23 Sep 2020
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');
The output you need is uniqueRows and probabilityOfUniqueRows.

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