Update nodal_roles.py

Author: Maxwell Bertolero

brainx/nodal_roles.py

@@ -54,7 +54,7 @@ def within_module_degree(graph, partition, weighted = False):
     return wd_dict
 
 
-def participation_coefficient(graph, partition):
+def participation_coefficient(graph, partition, weighted = False):
     '''
     Computes the participation coefficient for each node (Guimera et al. 2005).
 
@@ -127,4 +127,4 @@ def participation_coefficient(graph, partition):
                 else:
                     pc = 1 - ((float(bm_degree) / float(degree))**2)
                 pc_dict[source] = pc
-        return pc_dict
+        return pc_dict