The purge_vertices(in_place = False ) in he newest git version is OK. 

Best,

Liu

在 2014年4月30日星期三UTC+8下午3时44分48秒，Tiago Peixoto写道：

On 04/30/2014 09:37 AM, Tiago de Paula Peixoto wrote:
> On 04/30/2014 03:28 AM, Liu wrote:
>> Dear Tiago,
>>
>> I used G.purge_vertices(in_place=True). But the vertex filter didn't work.
>>
>> G.set_vertex_filter(prop=exist)
>> G.purge_vertices(in_place=True)
>>
>> gt.graph_draw(G, pos=pos)
>> # step 1 largest component in network A
>> UA = gt.GraphView(G, vfilt=v_type)
>>
>> line 45：LCA = gt.label_largest_component(UA)
>> exist.a = False
>> for v in G.vertices():
>>     if LCA[v]:
>>         exist[v] = True
>>         for n in v.all_neighbours():
>>             if not v_type[n]:
>>                 exist[v] = True
>>
>> G.set_vertex_filter(exist)
>> G.purge_vertices(in_place=True)
>>
>> Console warns that,
>> Traceback (most recent call last):
>>   File "/home/lockheed/PycharmProjects/cascade_failures/MAIN.py", line 45, in <module>
>>     LCA = gt.label_largest_component(UA)
>>   File "/usr/lib/python2.7/dist-packages/graph_tool/topology/__init__.py", line 814, in label_largest_component
>>     label.a = (c.a == h.argmax()) & (vfilt.a ^ inv)
>> ValueError: operands could not be broadcast together with shapes (248) (256)
>
> This seems to be something else. Could you please provide a full working
> example, so I can investigate?

I've fixed a related problem in the git version. Please try with
that. If it does not work, please send the full working example, and
I'll check it out.

Best,
Tiago

--
Tiago de Paula Peixoto <ti...@skewed.de>