matrix with elements sum of elements of old matrix

Hi Given I have an array: [3,4,2,5] I want to construct out if it a new array where the two last elements are summed to one - hence: [3,4,7]. Now I want to write code for arrays of aribtrary lengths - how do I do that? I was thinking of a for loop with something like:

for i = 1:length(array)-1
array_new(i) = array(i)
end

array_new(end+1) = array(end)+array(end-1)

but was wondering if there is a more efficient way to do that?

Answer 1

[Nobel Mondal]

This would work, but maybe there's a better solution.

a = [3 4 2 5];
a_new = a(1:end-1);
a_new(end) = a_new(end) + a(end);