Something like this may work for you:
# Setup your boolean property map, which should give you an empty array of zeros
v_mask = g.new_vertex_property('bool')
# Assign values to the mask property map array from another property map array
# In this case where a certain property map is <= to a value
# Note use of the .a to directly access the arrays -> shortcut for get_array()
method
v_mask.a = v_propMap.a <= val
# Then activate your filter
g.set_vertex_filter(v_mask)
# Remember to de-activate prior to running other operations on the whole graph
g.set_vertex_filter(None)
# Remember to clear or recreate your mask prior to new assignments
# This is what I use -> requires 'import numpy'
v_mask.a = numpy.zeros_like(v_mask.a)
There may be other methods that work better, but this has so far worked nicely
for me.
Gareth
On 7 Jul 2014, at 08:45, Giuseppe Profiti <[email protected]> wrote:
> With filters, you can either directly select a boolean property or apply a
> function. For example, if you have a property representing the temperature of
> nodes, you can select all nodes above a specific value and so on.
>
> Giuseppe
>
>
> 2014-07-07 9:32 GMT+02:00 Flavien Lambert <[email protected]>:
> Thanks a lot! To be sure to understand, in the XML file, a property must be
> defined as a boolean on the nodes and set as either 0 or 1, right?
>
>
> On 7 July 2014 15:18, Giuseppe Profiti <[email protected]> wrote:
> Hi Flavien,
> you may use filters as explained here
> http://graph-tool.skewed.de/static/doc/quickstart.html#graph-filtering
>
> Best,
> Giuseppe
>
>
> 2014-07-07 8:06 GMT+02:00 Flavien Lambert <[email protected]>:
> Hi all,
> I was wondering if there is a clever way to extract the list of vertices with
> a given value of a property or if you have to run a loop on the vertices on
> build the list by hand (I searched on the documentation but did not find
> it...).
> Thanks,
> F.
>
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