arrays - Matlab: A user-defined accumulator for a matrix -

let's assume have special function this:

function [sum] = e_add(v1, v2) 

and function implement this:

  acc = 0;   ri  = 1 : size(f,1)       ci = 1:size(f,2)           acc = e_add(acc,f(ri,ci));       end   end 

is there optimized way without loop, using arrayfun?

i'm little rusty on matlab, looking sum()? http://www.mathworks.com/help/matlab/ref/sum.html