seq.Date
Generate Regular Sequences of Dates
Description
The method for seq
for objects of class "Date"
representing calendar dates.
Usage
## S3 method for class 'Date' seq(from, to, by, length.out = NULL, along.with = NULL, ...)
Arguments
from | starting date. Required |
to | end date. Optional. |
by | increment of the sequence. Optional. See ‘Details’. |
length.out | integer, optional. Desired length of the sequence. |
along.with | take the length from the length of this argument. |
... | arguments passed to or from other methods. |
Details
by
can be specified in several ways.
-
A number, taken to be in days.
-
A object of class
difftime
-
A character string, containing one of
"day"
,"week"
,"month"
,"quarter"
or"year"
. This can optionally be preceded by a (positive or negative) integer and a space, or followed by"s"
.See
seq.POSIXt
for the details of"month"
.
Value
A vector of class "Date"
.
See Also
Examples
## first days of years seq(as.Date("1910/1/1"), as.Date("1999/1/1"), "years") ## by month seq(as.Date("2000/1/1"), by = "month", length.out = 12) ## quarters seq(as.Date("2000/1/1"), as.Date("2003/1/1"), by = "quarter") ## find all 7th of the month between two dates, the last being a 7th. st <- as.Date("1998-12-17") en <- as.Date("2000-1-7") ll <- seq(en, st, by = "-1 month") rev(ll[ll > st & ll < en])
Copyright (©) 1999–2012 R Foundation for Statistical Computing.
Licensed under the GNU General Public License.