| seq.POSIXt {base} | R Documentation |
Generate Regular Sequences of Dates
Description
The method for seq for data-time classes.
Usage
## S3 method for class 'POSIXt'
seq(from, to, by, length.out=NULL, along.with=NULL)
Arguments
from |
starting date. Required |
to |
end date. Optional. If supplied must be after |
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. |
Details
by can be specified in several ways.
A number, taken to be in seconds.
A object of class
difftimeA character string, containing one of
"sec","min","hour","day","week","month"or"year". This can optionally be preceded by an integer and a space.
Value
A vector of class "POSIXct".
See Also
DateTimeClasses
Examples
## first days of years in the (commonly used) 20th century
seq(ISOdate(1901,1,1), ISOdate(1999,1,1), "years")
## by month
seq(ISOdate(2000,1,1), by="month", length=12)
## quarters
seq(ISOdate(1990,1,1), ISOdate(2000,1,1), by="3 months")