Error

[Joel Goldstick]

On Wed, Nov 14, 2012 at 10:18 AM, inshu chauhan <insideshoes at gmail.com>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):
>
This code is only run if the test above is true

>                 centre = data[cy, cx]
>                 points.append(centre)
>
>
>             change = True
>
>             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)
>
centre is only set if the test above is true.  In your run, it apparently
wasn't

>                             if  dist < radius :
>                                 print point
>                                 points.append(point)
>                                 change = True
>                                 print change
>
>
>             break
>
>
> 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 ?
>
>
>
> --
> http://mail.python.org/mailman/listinfo/python-list
>
>


-- 
Joel Goldstick
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