Read calibration curve files

Reads the .14c and .f14c formats used for radiocarbon calibration curves and returns a c14_curve object.

For most files, only the first argument needs to be supplied. Further arguments can be used if the file does not follow the conventional format.

Usage

read_14c(
  file,
  format = c("14c", "f14c"),
  delim = NA,
  cal_era = "cal BP",
  col_names = switch(format, `14c` = c("cal_age", "c14_age", "c14_error", "d14c",
    "d14c_error"), f14c = c("cal_age", "f14c", "f14c_error"))
)

Arguments

file

Path, connection, or URL of a calibration curve file, typically with the extension .14c or .f14c.

format

"14c" or "f14c". If not supplied, will be inferred from the the extension of file.

delim

Character used to separate fields. If NA (the default), will be inferred from format: "," for .14c files or "" (any whitespace) for .f14c files.

cal_era

Character label or era::era object describing the time scale used in the calibration curve's cal_age field. Default: "cal BP".

col_names

Vector of column names specifying the order of fields in the file. If not supplied, they are assumed to be in the usual order. Must contain all of the following elements, depending on the value of format:

format = "14c":

"cal_age", "c14_age", "c14_error", and optionally "d14c" and "d14c_error"

format = "f14c":

"cal_age", "f14c", and "f14c_error"

See c14_curve() for more details on these fields.

Value

A c14_curve object.

See also

Other calibration curve functions: c14_curve()

Examples

read_14c(system.file("extdata", "intcal04.14c", package = "c14"))
#> # custom curve <c14_curve_14c>
#> # Conventional radiocarbon age calibration curve
#> # Range: -5–26000 cal BP
#>   cal_age c14_age c14_error  d14c d14c_error
#> 1   26000   21341       108 629.9       21.9
#> 2   25980   21348       103 624.5       20.8
#> 3   25960   21354        98 619.4       19.8
#> 4   25940   21360        93 614.3       18.7
#> 5   25920   21366        88 609.2       17.6
#> # 3297 more rows