%% Accumulate Data
% Create a vector of data, val, and a vector of subscript values with the same length, subs.

val = 101:105;
subs = [1; 3; 4; 3; 4]

%
% Use accumarray to sum the values in val that have identical subscripts in subs.

A = accumarray(subs,val)

% The result is a vector of accumulated values. Since the second and fourth elements of subs are equal to 3, A(3) is the sum of the second and fourth elements of val, that is, A(3) = 102 + 104 = 206. Also, A(2) = 0 because subs does not contain the value 2. Since subs is a vector, the output, A, is also a vector. The length of A is max(subs,[],1).
% Copyright 2012 The MathWorks, Inc.