Aha, thanks. That was not clear from the docs. I was confused because some 'original' property maps do seem to work when drawing a graph view, e.g. vertex_fill_color. On Thu, Oct 8, 2015 at 3:03 AM, Tiago de Paula Peixoto <tiago@skewed.de> wrote:

On 08.10.2015 00:21, Richard Ree wrote:

...

Hi, I think I've found a bug. Basically I'm trying to use vertex_size with graph_draw() using a GraphView, but it only seems to work with the original graph.

import graph_tool.all as gt from numpy.random import randint, random from itertools import izip

N = 50 g = gt.Graph()

g.add_vertex(N) # insert some random links for s,t in izip(randint(0, N, N), randint(0, N, N)): g.add_edge(g.vertex(s), g.vertex(t))

vsize = g.new_vertex_property('float') vsize.a = random(N)**2 vsize = gt.prop_to_size(vsize) vsize.a *= 10

# this works gt.graph_draw(g, vertex_size=vsize)

gv = gt.GraphView(g, vfilt=lambda v:v.out_degree()>1) # this doesn't gt.graph_draw(gv, vertex_size=vsize)

The traceback is:

/usr/lib/python2.7/dist-packages/graph_tool/draw/cairo_draw.pyc in get_bb(g, pos, size, pen_width, size_scale, text, font_family, font_size, cr) 1279 x_range = [pos_x.fa.min(), pos_x.fa.max()] 1280 y_range = [pos_y.fa.min(), pos_y.fa.max()] -> 1281 x_delta = [x_range[0] - (pos_x.fa - delta).min(), 1282 (pos_x.fa + delta).max() - x_range[1]] 1283 y_delta = [y_range[0] - (pos_y.fa - delta).min(),

ValueError: operands could not be broadcast together with shapes (13,) (50,)

It is not a bug. The "vsize" property belongs to the original graph, and hence will have a different number of elements. You need to do:

vsize = gv.own_property(vsize)

before calling graph_draw(). Note that, like GraphView, this does not duplicate the property map; it is only a "view".

Best, Tiago

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

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