mix.ccurves {rintcal} | R Documentation |
If two curves need to be ‘mixed’ to calibrate, e.g. for dates of mixed terrestrial and marine carbon sources, then this function can be used. The curve will be returned invisibly, or saved in a temporary directory together with the main calibration curves. This temporary directory then has to be specified in further commands, e.g. for rbacon: Bacon(, cc.dir=tmpdr)
(see examples). It is advisable to make your own curves folder and have cc.dir point to that folder.
mix.ccurves(
proportion = 0.5,
cc1 = "IntCal20",
cc2 = "Marine20",
postbomb1 = FALSE,
postbomb2 = FALSE,
name = "mixed.14C",
cc.dir = c(),
thiscurve1 = c(),
thiscurve2 = c(),
save = FALSE,
offset = cbind(0, 0),
round = c(),
sep = " "
)
proportion |
Proportion of the first calibration curve required. e.g., change to |
cc1 |
The first calibration curve to be mixed. Defaults to the northern hemisphere terrestrial curve IntCal20. |
cc2 |
The second calibration curve to be mixed. Defaults to the marine curve IntCal20. |
postbomb1 |
Option to provide a postbomb curve for the first curve (defaults to FALSE). |
postbomb2 |
Option to provide a postbomb curve for the second curve (defaults to FALSE). |
name |
Name of the new calibration curve. |
cc.dir |
Name of the directory where to save the file. Since R does not allow automatic saving of files, this points to a temporary directory by default. Adapt to your own folder, e.g., |
thiscurve1 |
As an alternative to using curves that come with the package, a tailor-made curve can be provided for the first curve (as three columns: cal BP, C14 age, error). |
thiscurve2 |
As an alternative to using curves that come with the package, a tailor-made curve can be provided for the second curve (as three columns: cal BP, C14 age, error). |
save |
Save the curve in the folder specified by dir. Defaults to FALSE. |
offset |
Any offset and error to be applied to |
round |
The entries can be rounded to a specified amount of decimals. Defaults to no rounding. |
sep |
Separator between fields (tab by default, "\t") |
The proportional contribution of each of both calibration curves has to be set.
A file containing the custom-made calibration curve, based on calibration curves cc1
and cc2
.
tmpdir <- tempdir()
mix.ccurves(cc.dir=tmpdir)
# now assume the offset is constant but its uncertainty increases over time:
cc <- ccurve()
offset <- cbind(rep(100, nrow(cc)), seq(0, 1e3, length=nrow(cc)))
# clean up:
unlink(tmpdir)