How to sum over next delta of rows

Hi,

I have a 527040 x 4 table

I need a new table, that gives me for each i = size(array,1) the sum of the next delta of rows

So for example set delta = 4

row 1 should be sum of rows 2 to 5

row 2 should be sum of rows 3 to 6 and so on

me biggest problem now is, i dont know what to do at the end of my input table if the number of remaining rows is smaller then my delta. I think the best idea is to just cut them out....

any ideas?

I use MATLAB R2019a for students