| seq.POSIXt {base} | R Documentation |
The methodw for seq for date-time classes
## S3 method for class 'POSIXt': 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. |
... |
arguments passed to or from other methods. |
by can be specified in several ways.
difftime
"sec",
"min", "hour", "day", "DSTday",
"week", "month" or "year". This can optionally be
preceded by an integer and a space, or followed by "s".
The difference between "day" and "DSTday" is that the
former ignores changes to/from daylight savings time and the latter takes
the same clock time each day. ("week" ignores DST, but
"7 DSTdays") can be used as an alternative. "month" and
"year" allow for DST as from R 1.5.0.)
A vector of class "POSIXct".
## first days of years seq(ISOdate(1910,1,1), 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") ## days vs DSTdays seq(ISOdate(2000,3,20), by="day", length = 10) seq(ISOdate(2000,3,20), by="DSTday", length = 10) seq(ISOdate(2000,3,20), by="7 DSTdays", length = 4)