Index Error

[inshu chauhan]

def distance(c, p):
    dist = sqrt(
            ((c[0]-p[0])**2) +
            ((c[1]-p[1])**2) +
            ((c[2]-p[2])**2)
            )
    return dist


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)
                    print new_indices
                    for idx in new_indices:
     I need help in this part as I am unable to device a method in
which if the
points are out of index,it should stop and
                        if idx[0] >= 300 and idx[1] >= 3000:           go
to next centre and start generating rings from there.. and again if the
index is out of range .. this should repeat
                            continue
                        else :
                            point = data[idx[0], idx[1]]
                            if point == (0.0, 0.0, 0.0 ):
                                print point
                                continue
                            else:
                                dist = distance(centre, point)
                                print dist
                                if  dist < radius :               and rings
should be added only when this condition is satisfied
                                    print point
                                    points.append(point)
                                    change = True
                                    print change


                        break


            print points


ERROR now :

data loaded
[(296, 403), (298, 403), (298, 405), (296, 405), (297, 403), (298, 404),
(297, 405), (296, 404)] ... I am printing Indices to know what index it
dies out..

Traceback (most recent call last):
  File "Z:/modules/Classify.py", line 73, in <module>
    ComputeClasses(data)
  File "Z:/modules/Classify.py", line 49, in ComputeClasses
    point = data[idx[0], idx[1]]
error: index is out of range
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