update previous state

def __updatePreviousState(self, tick):
        ''' update previous state '''
        self.__previousTick=tick
        self.__previousSmaShort=self.__smaShort.getLastValue()
        self.__previousSmaMid=self.__smaMid.getLastValue()
        self.__previousSmaLong=self.__smaLong.getLastValue()
        self.__previousSmaVolumeShort=self.__smaVolumeShort.getLastValue()
        self.__previousSmaVolumeMid=self.__smaVolumeMid.getLastValue()
        self.__previousMovingLowShort=self.__movingLowShort.getLastValue()
        self.__previousMovingLowWeek=self.__movingLowWeek.getLastValue()