def _num_values(self, zVar, varNum):
        '''
        Determines the number of values in a record.
        Set zVar=True if this is a zvariable.
        '''
        values = 1
        if (zVar == True):
            numDims = self.zvarsinfo[varNum][2]
            dimSizes = self.zvarsinfo[varNum][3]
            dimVary = self.zvarsinfo[varNum][4]
        else:
            numDims = self.rvarsinfo[varNum][2]
            dimSizes = self.rvarsinfo[varNum][3]
            dimVary = self.rvarsinfo[varNum][4]
        if (numDims < 1):
            return values
        else:
            for x in range(0, numDims):
                if (zVar == True):
                    values = values * dimSizes[x]
                else:
                    if (dimVary[x] != 0):
                        values = values * dimSizes[x]
            return values
Determines the number of values in a record.
        Set zVar=True if this is a zvariable.