Probability of Combinations Occurring

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

Answer 1

[the cyclist]

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.