fixed: _Rata Die_ (Fixed Date)

In aion: Archaeological Time Series

Rata Die (Fixed Date)

Description

Rata Die (Fixed Date)

Usage

fixed(year, month, day, calendar, ...)

## S4 method for signature 'numeric,missing,missing,GregorianCalendar'
fixed(year, calendar, scale = 1)

## S4 method for signature 'numeric,numeric,numeric,GregorianCalendar'
fixed(year, month, day, calendar)

## S4 method for signature 'numeric,numeric,numeric,JulianCalendar'
fixed(year, month, day, calendar)

Arguments

year	A numeric vector of years. If month and day are missing, decimal years are expected.
month	A numeric vector of months.
day	A numeric vector of days.
calendar	A TimeScale object specifying the calendar of year, month and day (see calendar()).
...	Currently not used.
scale	A length-one integer vector specifying the number of years represented by one unit. It should be a power of 10 (i.e. 1000 means ka).

Details

Rata die are represented as the number of days since 01-01-01 (Gregorian), with negative values for earlier dates.

Value

A RataDie object.

Author(s)

N. Frerebeau

References

Reingold, E. M. and Dershowitz, N. (2018). Calendrical Calculations: The Ultimate Edition. Cambridge University Press. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1017/9781107415058")}.

See Also

Other fixed date tools: arithmetic, as_date(), as_decimal(), as_fixed(), as_year(), fixed_gregorian, fixed_julian, format(), pretty()

Examples

## R 1.0.0
(y <- fixed(year = 2000, month = 02, day = 29, calendar = CE()))
as_date(y, calendar = CE())
as_year(y, calendar = CE())

## Create a vector of years BP (Gregorian)
## (every two years starting from 2000 BP)
(years <- seq(from = 2000, by = -2, length.out = 10))
## Convert years to rata die
(rd <- fixed(years, calendar = BP()))
## Convert back to Gregorian years BP
as_year(rd, calendar = BP())

## More convenient
(rd <- fixed_from_BP(years))
fixed_to_BP(rd)

aion documentation built on Oct. 4, 2024, 5:07 p.m.