Find the calendar date from the fraction modern value given known bounding indices

tau_curve and phi_curve give the calendar date and fraction modern of the radiocarbon calibration curve. It is known that the calendar date lies between tau_curve[ii_lo] and tau_curve[ii_hi]. Interpolate to find the calendar date corresponding to the input phi_known. This function is called by assess_calib_curve_equif.

phi2tau(tau_curve, phi_curve, phi_known, ii_lo, ii_hi)

Arguments

tau_curve	Calibration curve calendar dates
phi_curve	Calibration curve fraction moderns
phi_known	Known fraction modern value
ii_lo	Lower bounding index
ii_hi	Upper bounding index

Value

The calendar date corresponding to the input phi_known

See also

assess_calib_curve_equif()