Pajek (.net)

Pajek graph language and data format.
Commonly used exchange format for graphs.
Native format of the Pajek network analysis software.
The format name is Slovenian for spider.
Stores a single directed, undirected, or mixed graph.
Can contain user-defined edge and vertex attributes.
Plain text format.
Developed in 1996 by researchers at Ljubljana University.

Import and ExportImport and Export

  • Import["file.net"] gives a Graph object representing the graph stored in the specified file.
  • Export["file.net", expr] exports an adjacency matrix or edge information representing a graph to the Pajek format.
  • Import["file.net"] imports the graph from file and returns it as a Graph.
  • Import["file.net", elem] imports the specified element from a Pajek file.
  • Import["file.net", {{elem1, elem2, ...}}] imports multiple elements.
  • The import format can be specified with Import["file", "Pajek"] or Import["file", {"Pajek", elem, ...}].
  • Export["file.net", expr, elem] creates a Pajek file by treating expr as specifying element elem.
  • Export["file.net", {expr1, expr2, ...}, {{elem1, elem2, ...}}] treats each as specifying the corresponding .
  • Export["file.net", expr, opt1->val1, ...] exports expr with the specified option elements taken to have the specified values.
  • Export["file.net", {elem1->expr1, elem2->expr2, ...}, "Rules"] uses rules to specify the elements to be exported.
  • See the reference pages for full general information on Import and Export.
  • ImportString and ExportString support the Pajek file format.

ElementsElements

  • General Import elements:
  • "Elements"list of elements and options available in this file
    "Rules"full list of rules for each element and option
    "Options"list of rules for options, properties, and settings
  • Data representation elements:
  • "AdjacencyMatrix"edge information, given as a matrix
    "EdgeAttributes"edge attributes, represented as a list of rules
    "EdgeRules"connectivity data for the graph, given as a list of rules
    "EdgeRulesDirected"directed edges
    "EdgeRulesUndirected"undirected edges
    "Graph"graph stored in the file, given as a Graph object
    "Graphics"graph stored in the file, rendered as a graph plot
    "VertexAttributes"vertex attributes, represented as a list of rules
    "VertexCount"number of vertices in the graph
  • Import by default uses the element when importing from Pajek.

OptionsOptions

ExamplesExamplesopen allclose all

Basic Examples (6)Basic Examples (6)

Import a Graph object from a Pajek file:

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Show the Import elements available from an example file:

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Import the connectivity rules of a graph:

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Export a Graph to the Pajek format:

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Export an asymmetric adjacency matrix of a graph to the Pajek format:

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Convert a list of edge rules representing an undirected graph to the Pajek language:

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