Locate Endpoints by Time
Extract index values of a given xts object corresponding
to the last observations given a period specified by on
endpoints(x, on="months", k=1)
x |
an xts object |
on |
the periods endpoints to find as a character string |
k |
along every k-th element - see notes |
endpoints returns a numeric 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.
Valid values for the argument on include: “us” (microseconds),
“microseconds”, “ms” (milliseconds),
“milliseconds”, “secs” (seconds),
“seconds”, “mins” (minutes), “minutes”,
“hours”, “days”, “weeks”, “months”, “quarters”,
and “years”.
A numeric vector of endpoints beginning with 0 and ending with the a value equal to the length of the x argument.
Jeffrey A. Ryan
data(sample_matrix) endpoints(sample_matrix) endpoints(sample_matrix, 'weeks')
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