Pajek (.net)

BackgroundBackground

    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:

In[1]:=
Click for copyable input
Out[1]=

Show the Import elements available from an example file:

In[1]:=
Click for copyable input
Out[1]=

Import the connectivity rules of a graph:

In[1]:=
Click for copyable input
Out[1]=

Export a Graph to the Pajek format:

In[1]:=
Click for copyable input
Out[1]=

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

In[1]:=
Click for copyable input
Out[1]=

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

In[1]:=
Click for copyable input
Out[1]=
Introduced in 2010
(8.0)