Sum of matrix elements

I have that matrix

p=[4 9 3 3 6 8 8 12 6]

and i want to reach that one

k=[4 13 16 19 25 33 41 53 59]

I made with for loop but is seems like

k=[13 16 19 25 33 41 53 59 ]

how can i fix it?

Answer 1

[Stephen23]

>> k = cumsum(p)
k =
    4   13   16   19   25   33   41   53   59

Answer 2

[ES]

cumsum(p)