How to add values in a vector based on repeating values on another?
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Hi
I have two vectors of the same length 
and 
. I want it to be so that everytime a value in the first array repeats(for example the 2 in 1 and 9) the values in the second array would add up(so 7.8953..+8.5184).
and . I want it to be so that everytime a value in the first array repeats(for example the 2 in 1 and 9) the values in the second array would add up(so 7.8953..+8.5184). Réponse acceptée
Walter Roberson
le 26 Fév 2021
accumarray(first_vector, second_vector)
This requires that first_vector is positive integers. The size of the result will be max(first_vector) x 1
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