Index Error

Wed Nov 21 08:32:26 EST 2012

>> <snip>
>>>>> Back to an earlier comment. I asked if N was ever bigger than x or
>> bigger than y, and you said never. But your ComputeClasses will have
>> such a case the very first time around, when cx==0, cy==0, and
>> ring_number == 1.
>>>> I doubt this , M confused..
>
I'll paste an excerpt of the last source I've seen from you:
"""
def GenerateRing(x,y, N): Generates square rings around a point in data
which has 300 columns(x) and 3000 rows(y)
 indices = []
 for i in xrange(-N, N):
 indices.append((x+i, y-N))
 indices.append((x+N, y+i))
 indices.append((x-i, y+N))
 indices.append((x-N, y-i))
 return indices
def ComputeClasses(data):
 radius = .5
 points = []
 for cy in xrange(0, data.height):
 for cx in xrange(0, data.width):
 if data[cy,cx] == (0.0,0.0,0.0):
 continue
 else :
 centre = data[cy, cx]
 points.append(centre)
 change = True
 while change:
 for ring_number in xrange(1, 100):
 change = False
 new_indices = GenerateRing(cx, cy, ring_number)
"""
When that GenerateRing() is first called, cy will be zero, cx the same,
and ring_number will be 1.
So some of the tuples in the returned list will have negative ints. You
don't check for that either.
I still think that data.height and data.width aren't the right limits to
be using.
-- 
DaveA