Add value in column to previous?

data_input=[1;1;1;1;1;1;1]
data_output=[1;2;3;4;5;6;7]

how can i achieve this with a for loop? basically take the preceding value and add it to the next one and then repeat as new values emerge.

Answer 1

[Azzi Abdelmalek]

a=[1 1 1 1 1]
b=cumsum(a)

[matlabuser12]

for some reason i thought that summed the whole column and never tried it. thanks!