GetTreeRootNId

GetTreeRootNId()

A graph method for directed graphs that returns the root id of the tree, if a graph is a tree. Otherwise, it returns -1.

Parameters:

• None

Return value:

• int

  If the graph is a tree, the node id of the root. Otherwise, -1 is returned.

The following example shows how to get the root node id in TNGraph and TNEANet:

import snap

Graph = snap.GenTree(snap.TNGraph, 3, 3)
root_id = Graph.GetTreeRootNId()
print("The graph has a root id: %d" % root_id)

Network = snap.GenTree(snap.TNEANet, 3, 3)
root_id = Network.GetTreeRootNId()
print("The graph has a root id: %d" % root_id)