MATLAB Accumarray weighted mean

Question

So I am currently using \'accumarray\' to find the averages of a range of numbers wich correspond to matching ID\'s. Ex Input:

ID----Value
1     215
1     33         


        

Answer 1

What you are trying to compute is not a weighted mean, but rather a weighted histogram.
There is a mex implementation of weighted histogram that can be found here. Though, accumarray is the safe way to go about.