Yes you are rightI figured that out after posting to python list.. actually my index is reaching the last point.. and my prog is not doing what I want.. I am wondering why it is reaching the last point in my list .. its never stopping in between ???
On Tue, Nov 20, 2012 at 2:01 PM, Dave Angel <d...@davea.name> wrote: > On 11/20/2012 07:31 AM, inshu chauhan wrote: > > I did the following changes in this part of my programme.. now the > > refereence error is removed but its showing me another error : > > > > 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] > > print centre > > 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) > > if dist < radius : > > print point > > points.append(point) > > change = True > > print change > > > > > > break > > > > > > print points > > > > > > ERROR : > > > > Traceback (most recent call last): > > File "Z:/modules/classification1.py", line 71, in <module> > > ComputeClasses(data) > > File "Z:/modules/classification1.py", line 47, in ComputeClasses > > point = data[idx[0], idx[1]] > > error: index is out of range > > > > What is meant by this statement ' Index out of range ' ? Does it mean > that > > my range 1, 1000 is exceeded ?? > > > > > > When you're using custom classes that mimic the standard ones, the error > can mean most anything. But assuming the design was to keep as close as > possible, it simply means that you're subscripting a list with an index > that's too large or too small. So if idx is a list that has only one > element, element number zero, then idx[1] would be out of range. On the > same line, if data is acting kind of like a two-dimensional list, then > it has limits on each dimension, and either idx[0] is too big/small for > the first dimension, or idx[1] is too big or small for the second. > > First thing is to figure out which part of this expression is causing > the exception. So do a separate pair of assignments, > dummy0 = idx[0] > dummy1 = idx[1] > > and then point = data[dummy0, dummy1] > > Incidentally, if idx is a tuple or a list, of exactly two items, then > you could just say > point = data[*idx] > > Anyway, if that still doesn't make things clear, then print dummy0 and > dummy1 before the point= line. That way you can see the last value, the > one it dies on, just before the stack trace. Naturally, you could also > print the size attributes of the data item as well. > > > -- > > DaveA > >
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