I remember an old discussion about vectors of floats saved using the C99 hexadecimal notation. However, a colleague found out that also a simple float property map is saved using that notation and this is giving him troubles of interoperability.

As an example

from graph_tool.all import *

g = Graph()

n = g.add_vertex()

n1 = g.add_vertex()

e = g.add_edge(n,n1)

p = g.new_edge_property('float')

p[e]=3.14

g.edge_properties['weight']=p

g.save('float-test.xml')

float-test.xml then contains:

...

<key id="key0" for="edge" attr.name="weight" attr.type="float" />

...

Is this the expected behaviour? Also, there is no difference if we change the type from float to double.

Thanks,

Giuseppe