% Generated by roxygen2: do not edit by hand % Please edit documentation in R/AllGenerics.R, R/calendar-julian.R \docType{methods} \name{fixed_julian} \alias{fixed_julian} \alias{fixed_from_julian} \alias{fixed_to_julian} \title{\emph{Rata Die} Conversion to and from Julian Years} \usage{ fixed_from_julian(year, month, day) fixed_to_julian(object) } \arguments{ \item{year}{A \code{\link{numeric}} vector of years. If \code{month} and \code{day} are missing, decimal years are expected.} \item{month}{A \code{\link{numeric}} vector of months.} \item{day}{A \code{\link{numeric}} vector of days.} \item{object}{A \code{\linkS4class{RataDie}} object (see \code{\link[=fixed]{fixed()}}).} } \value{ \itemize{ \item \code{fixed_from_julian()} returns a \code{\linkS4class{RataDie}} object. \item \code{fixed_to_julian()} returns a \code{\link{numeric}} vector of Julian years. } } \description{ Convenient functions for conversion from and to \emph{rata die}. } \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) } \references{ Reingold, E. M. and Dershowitz, N. (2018). \emph{Calendrical Calculations: The Ultimate Edition}. Cambridge University Press. \doi{10.1017/9781107415058}. } \seealso{ Other fixed date tools: \code{\link{arithmetic}}, \code{\link{as_date}()}, \code{\link{as_decimal}()}, \code{\link{as_fixed}()}, \code{\link{as_year}()}, \code{\link{fixed_gregorian}}, \code{\link{fixed}()}, \code{\link{format}()}, \code{\link{pretty}()} } \author{ N. Frerebeau } \concept{fixed date tools}