How to extract value from matrix and add a constant repeatedly?

I'm trying to get my script to extract values from an array and add to a know constant and form a new array.

x = 2 % Constant
y = [1 3 2 7 8] % Array

Z1 = x + y(5);
Z2 = Z1 + y(4);
Z3 = Z2 + y(3); 
% etc

As seen above the last value in the array is extracted and added to the known constant. This new value is the used to find a new constant (Z2) by adding the fourth value in the array. I need this to repeat for all values in the array from y(5) to y(1), however, in a way where the 'y' array can be of any size.

Any help is much appreciated :)

Answer 1

[Adam Danz]

Take the cumulative sum of y from right to left after adding 2 to the end:

x = 2; % scalar
y = [1 3 2 7 8]; % row vector
z = cumsum(fliplr(y+[zeros(1,numel(y)-1),x]))

z = 1×5

10 17 19 22 23

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