;;; corresponding times t0, t1, ..., tn -- and an initial values q0,
;;; return a list q0, q1, ..., qn of the cumulative values.
;;; q0 is the initial value given.
;;; corresponding times t0, t1, ..., tn -- and an initial values q0,
;;; return a list q0, q1, ..., qn of the cumulative values.
;;; q0 is the initial value given.