BCADtoC14: Find the 14C age and error belonging to a BC/AD age.

In rice: Radiocarbon Equations

Find the 14C age and error belonging to a BC/AD age.

Description

Given a calendar age, the calibration curve (default cc=1) is interpolated and the corresponding 14C age and error are returned. BC ages are negative. In this implementation, the year 0 BC/AD does exist.

Usage

BCADtoC14(
  x,
  cc = 1,
  postbomb = FALSE,
  zero = TRUE,
  rule = 1,
  cc.dir = NULL,
  thiscurve = NULL
)

Arguments

x	The BC/AD year.
cc	calibration curve for C14 (see caldist()).
postbomb	Whether or not to use a postbomb curve (see caldist()).
zero	Whether or not to include 0 in BC/AD years. Defaults to TRUE.
rule	How should R's approx function deal with extrapolation. If rule=1, the default, then NAs are returned for such points and if it is 2, the value at the closest data extreme is used.
cc.dir	Directory of the calibration curves. Defaults to where the package's files are stored (system.file), but can be set to, e.g., cc.dir="curves".
thiscurve	As an alternative to providing cc and/or postbomb, the data of a specific curve can be provided (3 columns: cal BP, C14 age, error).

Details

Interpolation is used, and values outside the calibration curve are given as NA. For ages younger than AD 1950, a postbomb curve will have to be provided.

Value

The calibration-curve 14C year belonging to the entered BC/AD age

Author(s)

Maarten Blaauw

Examples

  BCADtoC14(100)

rice documentation built on April 11, 2025, 5:53 p.m.