The Vertex methods in_neighbours() and all_neighbours() throw an error for undirected graphs. Is this behavior intended? Code:
import numpy as np import numpy.random as rand import graph_tool.all as gt
n = 1000; p = 2.0*np.log(n)/n g = gt.random_graph(n, lambda: rand.poisson((n - 1) * p), directed=False, model="erdos") v = [v for v in g.vertices() if g.vertex_index[v] == 0][0] [u.__int__() for u in v.out_neighbours()]
# Fail: [u.__int__() for u in v.in_neighbours()] # Fail: [u.__int__() for u in v.all_neighbours()]
# Correct by setting direction g.is_directed() g.set_directed(True) g.is_directed() [u.__int__() for u in v.in_neighbours()] [u.__int__() for u in v.out_neighbours()]
Error:
File "gt_test.py", line 11, in <module> [u.__int__() for u in v.in_neighbours()] File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/graph_tool/__init__.py", line 2327, in _in_neighbours yield e.source() ValueError: invalid edge descriptor