seq.Date

From base v3.6.2 by R-core R-core@R-project.org

Generate Regular Sequences of Dates

The method for seq for objects of class class "Date" representing calendar dates.

Keywords: manip, chron

Usage

# S3 method for 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".

Examples

library(base)

# NOT RUN {
## 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])
# }

Documentation reproduced from package base, version 3.6.2, License: Part of R 3.6.2

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