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 <gamma2@users.sourceforge.net> 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 <petit.lepton@gmail.com>:

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 <gamma2@users.sourceforge.net> 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 <petit.lepton@gmail.com>:

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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