i want to obtain a vector that each element is subtract from the previous one

if i have values q={3 6 8 10 12 15 16} and i want to obtain a vector that gives me: k={3 3 2 2 2 3 1}

K(ii)=q(ii)-q(ii-1)

how can i do that

Answer 1

[Fangjun Jiang]

diff()

[Mahmoud Chawki]

it worked thank you