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How can I determine the expected sum of randomly chosen numbers from vector? (combinatorics)

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T FW
T FW 2020-4-23
回答： Joost 2020-4-26
Hello there,
I would like to solve the following problem with Matlab.
If you choose two numbers out of this vector [-1 -1 -1 1], what is their sum, on average?
With nchoosek(4,2) I can determine that there are 6 combinations, but how can I iterate through these combinations to determine each of the 6 sums?
Thanks,
Tobias

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Joost
Joost 2020-4-26
The nchoosek function can give you all combinations of 2 elements from the vector.
Instead of nchoosek(4, 2), use nchoosek([-1 -1, -1, 1], 2)
I am not sure how it deals with replicas.

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