On 2012-11-14 15:18, inshu chauhan wrote:
for this code m getting this error :
CODE :
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):
centre = data[cy, cx]
points.append(centre)
Look at this line:
change = True
It's indented the same as the preceding 'if' statement, which means
that it's executed even if the body of the 'if' statement wasn't
executed and it hasn't assigned to 'centre'.
So 'change' has been set to True, the 'while' loop is entered, and
subsequently an attempt is made to get 'centre', which hasn't been set.
while change:
for ring_number in xrange(1, 1000):
change = False
new_indices = GenerateRing(cx, cy, ring_number)
for idx in new_indices:
point = data[idx[0], idx[1]]
if point == (0.0, 0.0, 0.0 ):
continue
else:
dist = distance(centre, point)
if dist < radius :
print point
points.append(point)
change = True
print change
The indentation of this line looks wrong to me:
break
It'll affect the 'for cx' loop at the end of its first iteration, every
time.
ERROR :
Traceback (most recent call last):
File "Z:\modules\classification2.py", line 74, in <module>
ComputeClasses(data)
File "Z:\modules\classification2.py", line 56, in ComputeClasses
dist = distance(centre, point)
UnboundLocalError: local variable 'centre' referenced before assignment
And i am unable to understand .. WHY ?
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