one time projection kin. internal function.
timevarying_kin_2sex(Ut, Ft, Ft_star, pit, sex_focal, ages, pkin)
numeric. A matrix of survival probabilities (or ratios).
numeric. A matrix of age-specific fertility rates.
numeric. Ft but for female fertility.
numeric. A matrix with distribution of childbearing.
character. "f" for female or "m" for male.
numeric.
numeric. A list with kin count distribution in previous year.
A list of 14 types of kin matrices (kin age by Focal age, blocked for two sex) projected one time interval.