I'm not exactky sure what's causing the errant behaviour but it might
help if we start off by simplifying the code a little.
> for N in range( 2, len( DEF_CARRIER_TUP) ):
> Dis_N = DistanceCalc( DEF_CARRIER_TUP[N],
> DEF_CARRIER_TUP[N-1] )
> print ( "Distance = " + str(Dis_N) )
print "Distance = ", Dis_N
> Dis_Tot = float ( Dis_N ) + float ( DEF_CARRIER_DIS[N-1] )
Dis_Tot = Dis_N + DEF_CARRIER_DIS[N-1]
Dis_N is already a float from the print statement. And DisTot is
simply the collection of totals so is also floats, no need for
conversion.
> print ( "New Total = " + str( Dis_Tot) )
print "New Total = ", Dis_Tot
> DEF_CARRIER_DIS.append( Dis_Tot )
Also I don't see any uinitialisation of DEF_CARRIER_DIS, but as
written
the first time through the loop you access N-1, ir element 1. I have
no idea what is in element 1, but you then procede to append to it,
now the new element will go to element len(DEF_CARRIER_DIS).
Its not obvious to me the relationship between the data being
appended to the list and the data being used to do the calculation
from index N-1.
> New Total = 0.336672732923 > Distance = 0.336681748175
> New Total = 0.673377528119 > Distance = 0.336678894036
> New Total = 0.673351626959 > Distance = 0.336692518582
> New Total = 1.0100700467 > Distance = 0.336678428545
> New Total = 1.0100300555 > Distance = 0.336681289645
> New Total = 1.34675133635 > Distance = 0.336684966109
> New Total = 1.34671502161 > Distance = 0.336689614642
> New Total = 1.68344095099 > Distance = 0.336680540776
> New Total = 1.68339556239
Looking at these results I think there is a mismatch between N_1 and
the current position in the list. I think you are somehow reading
one behind where you are writing. I'd look at the initialisation
of that list.
Another option might be to use -1 as the index to ensure you
always use the last element:
Dis_Tot = Dis_N + DEF_CARRIER_DIS[-1]
HTH,
Alan G.
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