LoadEdgeList

LoadEdgeList(GraphType, InFNm, SrcColId, DstColId)

Loads a (directed, undirected or multi) graph from a text file InFNm with 1 edge per line (whitespace separated columns, int node ids).

InFNm is a whitespace separated file of several columns: ... <source node id> ... <destination node id> ... Since the function assumes each line of the file encodes a single edge and a line in the file can have more than 2 columns, SrcColId and DstColId must be provided to indicate which column gives the source and which column gives the destination of the edge.

Parameters:

  • GraphType: graph class (input)

    Class of output graph – one of PNGraph, PNEANet, or PUNGraph.

  • InFNm: string (input)

    Filename with the description of the graph edges.

  • SrcColId: int (input)

    The column number in the file, which contains the node id representing the source vertex.

  • DstColId: int (input)

    The column number in the file, which contains the node id representing the destination vertex.

Return value:

  • graph

    A Snap.py graph or a network represented by the InFNm of type GraphType.

The following example shows how to load a small file representing a graph:

import snap;

Graph = snap.LoadEdgeList(snap.PNGraph, "toy_graph", 0, 1)
Graph.Dump()

UGraph = snap.LoadEdgeList(snap.PUNGraph, "toy_graph", 0, 1)
UGraph.Dump()

Network = snap.LoadEdgeList(snap.PNEANet, "toy_graph", 0, 1)
Network.Dump()

An example file is given below (toy_graph)

1 1
1 2
2 1
1 3

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