returns an intege vector of endpoints beginning with 0 and ending
with the a value equal to the length of the x argument.
Arguments
x
a timeDate object.
on
the periods endpoints to find as a character string.
Select from: "months", "years",
"quarters", "weeks", "days",
"hours", "minutes", "seconds".
k
along every k-th element.
Author
Jeff Ryan, modofied by Diethelm Wuertz for timeDate objects.
Details
endpoints returns an integer vector corresponding to the last
observation in each period specified by on, with a zero added
to the beginning of the vector, and the index of the last observation
in x at the end.