seq.POSIXt {base} | R Documentation |
The method for seq
for data-time classes.
seq(from, to, by, length.out=NULL, along.with=NULL)
from |
starting date. Required |
to |
end date. Optional. If supplied must be after from . |
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. |
by
can be specified in several ways.
difftime
"sec"
,
"min"
, "hour"
, "day"
, "week"
,
"month"
or "year"
. This can optionally be
preceded by an integer and a space.
A vector of class "POSIXct"
.
## 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")