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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