On 11/09/2013 01:01 AM, vcongz wrote:
> Dear Tiago,
>
> Thanks, it works. But when I save the sub-graph, the new xml.gz file is
> still the original graph.
>
> My code seems like:
> ############################################################
> g = load_graph("g.xml.gz")
>
> print g.num_vertices(), g.num_edges()
>
> c = g.vertex_properties["com"]
>
> target_com = [2,4,5]
>
> new_g = GraphView(g, vfilt = lambda v: c[v] in target_com)
>
> print new_g.num_vertices(), new_g.num_edges()
>
> new_g.save("new_g.xml.gz")
> ############################################################
> When I print the number of their edges and vertices, g and new_g have
> different number of edges and vertices.
> But, after saving the new_g, the new_g.xml.gz has same content with
> g.xml.gz.
>
> What is the reason ? Thank you for your help!
The reason is that the filtered graph is just like the unfiltered graph,
but with a filter on top. Filtering is a reversible operation, and can
be removed at any time. If you want to delete the filtered vertices you
can make:
new_g.purge_vertices()
Cheers,
Tiago
--
Tiago de Paula Peixoto <[email protected]>
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