negative BP values

[Tommaso Tesi]

Hi,

I have been using C_Date in OxCal without any issues so far. Recently, however, I noticed that when I mix C_Date and R_Date entries in the same sequence, the calibrated BP values from C_Date appear negative in the output.

I initially thought this might be related to the X-axis format, which is correctly set to BP. However, even with the correct settings, the negative BP values persist. It seems that I now have to manually convert the C_Date values into BC/AD to avoid this issue, which is confusing because previously using BP worked fine.

I have tried this simple test nelow as well which returns negatie BP values; again this does not make any sense and I don't under what I'm doing wrong

thanks

T.

Plot()
{
  C_Date("Test1", 14500, 150, "CalBP");
  C_Date("Test2", 12700, 150, "CalBP");
};

[Christopher Ramsey]

This will be because in general OxCal takes astronomical year dates as the input. There is more information at:

https://c14.arch.ox.ac.uk/oxcalhelp/hlp_analysis_inform.html#date

C_Date is a legacy method which can either take astronomical years (the default) or if you set the options you can get it to use calBP instead - see:

https://c14.arch.ox.ac.uk/oxcalhelp/hlp_analysis_detail.html#opt

I would generally suggest that you either use:

Date("Test1",N(calBP(14500),150));

or

C_Date("Test1",calBP(14500),150);

with the options left as the default.

Best wishes

Christopher

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