def xirrrate(self, date=yesterdayobj(), startdate=None, guess=0.01):
"""
xirr rate evauation of the whole invest combination
:param date: string or obj of datetime, the virtually sell-all date
:param startdate: string or obj of datetime, the beginning date of calculation, default from first buy
"""
return xirrcal(self.totcftable, self.fundtradeobj, date, startdate, guess)
def xirrrate(self, date=yesterdayobj(), guess=0.1):
'''
xirr rate evauation of the whole invest combination
'''
return xirrcal(self.totcftable, self.fundtradeobj, date, guess)