Add Consecutive Numbers sent to a Matrix in a Matlab Function

Hello, I am writing a function that adds the second value sent to a matrix to the first, the thrid number to the sum of the first two numbers, the fourth number to the sum of the first three...and so on till the last value is added to the sum of all previous values. Any help is greatly apprieciated

function [travel_dist] = DeltaDistance(xB_1) 
       sumxB = xB_1(1) + xB_1(2) 
       travel_dist = deltaX_s-sumxB
    end

Answer 1

[James Tursa]

Sounds like maybe you want persistent variable behavior. E.g.,

function travel_dist = DeltaDistance(x)
persistent y
if( isempty(y) )
    y = x;
else
    y = y + x;
end
travel_dist = y;
end