spaghetti: TypeError: '>' not supported between instances of '_NodeCursor' and '_NodeCursor'

Hi! @jGaboardi!!

I’m trying to snap points to lines using the function net.snapobservations(shp, 'obs') with the git version of spaghetti but I have this error. Can you help me please?

Thank you!

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-14-964ead266930> in <module>
----> 1 net.snapobservations(shp, 'obs', attribute=False)

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/spaghetti/network.py in snapobservations(self, in_data, name, idvariable, attribute)
    773                                                 idvariable=idvariable,
    774                                                 attribute=attribute)
--> 775         self._snap_to_link(self.pointpatterns[name])
    776 
    777 

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/spaghetti/network.py in _snap_to_link(self, pointpattern)
    882             points[point_idx] = point['coordinates']
    883 
--> 884         snapped = util.snap_points_to_links(points, arcs_)
    885 
    886         # record obs_to_arc, dist_to_vertex, and dist_snapped

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/spaghetti/util.py in snap_points_to_links(points, links)
    393 
    394         r = cg.Rect(x0, y0, x1, y1)
--> 395         rt.insert(link, r)
    396 
    397     # Build a KDtree on link vertices.

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/libpysal/cg/rtree.py in insert(self, o, orect)
    198 
    199     def insert(self, o, orect):
--> 200         self.cursor.insert(o, orect)
    201         assert(self.cursor.index == 0)
    202 

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/libpysal/cg/rtree.py in insert(self, leafo, leafrect)
    415                     self.root, leafo, leafrect))
    416 
--> 417                 self._balance()
    418 
    419                 # done: become the original again

~/.pyenv/versions/3.6.4/envs/points/lib/python3.6/site-packages/libpysal/cg/rtree.py in _balance(self)
    460             self.root, k, s_children) for k in range(2, MAX_KMEANS)]
    461         score, bestcluster = max(
--> 462             [(silhouette_coeff(c, memo), c) for c in clusterings])
    463 
    464         nodes = [_NodeCursor.create_with_children(

TypeError: '>' not supported between instances of '_NodeCursor' and '_NodeCursor'