Compose a standardized dataframe to be wrangled by the function
format_input(input = NULL, v_v = NULL, t_v = NULL, data)a string stating whether the data frame to be created is
for the disturbed system (input = "d") or for the baseline
(input = "b"))
a numerical vector passed to the function as v_resp or
v_b
a numerical vector passed to the function as t_resp,
t_b or NULL
a dataframe passed to the function as data_resp,
data_b or NULL