angular_difference arithop_tnumber_number arithop_tnumber_tnumber datum_exp datum_ln datum_log10 delta_value float_angular_difference float_exp float_ln float_log10 tfloat_arithop_turnpt tfloat_exp tfloat_ln tfloat_log10 tnumber_abs tnumber_angular_difference tnumber_delta_value tnumberinst_abs tnumberseq_abs tnumberseq_angular_difference tnumberseq_angular_difference_iter tnumberseq_delta_value tnumberseq_iter_abs tnumberseq_linear_abs tnumberseqset_abs tnumberseqset_angular_difference tnumberseqset_delta_value

datum_ln() static Datum datum_ln ( Datum  d ) static Return the natural logarithm of a double. Parameters [in] d Value Note Function used for lifting