How to add values in a vector based on repeating values on another?
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Maaz Madha
il 25 Feb 2021
Risposto: Walter Roberson
il 26 Feb 2021
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).
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/532084/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/532089/image.png)
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Walter Roberson
il 26 Feb 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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