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How do I do calculations with the last and first array member in a for loop?

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abraham rodriguez
abraham rodriguez on 5 Sep 2018
Edited: abraham rodriguez on 5 Sep 2018
for example, I want to show another matrix that its elements are the sum of consecutive members in the original array, and the last showing the sum of the last with the first element, without explicitly managing the last case.
test = [1 2 3];
consecutiveSum = [ test(1) + test(2) , test(2) + test(3) , test(3) + test(1) ];
How can I implement this in a for loop?

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Answers (1)

the cyclist
the cyclist on 5 Sep 2018
Edited: the cyclist on 5 Sep 2018
test = [1 2 3];
N = numel(test);
idx = [1:N; [2:N,1]];
consecutiveSum = sum(test(idx));

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