How do you get all pairs without double counting?

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L'O.G.
L'O.G. on 16 Jul 2022
Answered: Voss on 16 Jul 2022
Given, say, 10 numbers, how do you get all possible pairs between the numbers without double counting? Order doesn't matter, so 1-3 is the same as 3-1. How would you do this with for loops vs. vectorized? Is there a difference in performance between the two?

Answers (1)

Voss
Voss on 16 Jul 2022
Here's one way:
ten_numbers = 1:10;
all_pairs = nchoosek(ten_numbers,2);
disp(all_pairs);
1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 10 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 10 3 4 3 5 3 6 3 7 3 8 3 9 3 10 4 5 4 6 4 7 4 8 4 9 4 10 5 6 5 7 5 8 5 9 5 10 6 7 6 8 6 9 6 10 7 8 7 9 7 10 8 9 8 10 9 10

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