NetworkX

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Version 0.99 API changes

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Release Log

Networkx-1.2

Release date: 28 July 2010

See: https://networkx.lanl.gov/trac/timeline

New features

Networkx-1.1

Release date: 21 April 2010

See: https://networkx.lanl.gov/trac/timeline

API Changes

Returning dictionaries

Several of the algorithms and the degree() method now return dictionaries keyed by node instead of lists. In some cases there was a with_labels keyword which is no longer necessary. For example,

>>> G=nx.Graph()
>>> G.add_edge('a','b')
>>> G.degree() # returns dictionary of degree keyed by node
{'a': 1, 'b': 1}

Asking for the degree of a single node still returns a single number

>>> G.degree('a')
1

The following now return dictionaries by default (instead of lists) and the with_labels keyword has been removed:

The following now return dictionaries by default (instead of lists)

Adding nodes

add_nodes_from now accepts (node,attrdict) two-tuples

>>> G=nx.Graph()
>>> G.add_nodes_from([(1,{'color':'red'})])

Bug fixes

  • Support graph attributes with union, intersection, and other graph operations
  • Improve subgraph speed (and related algorithms such as connected_components_subgraphs())
  • Handle multigraphs in more operators (e.g. union)
  • Handle double-quoted labels with pydot
  • Normalize betweeness_centrality for undirected graphs correctly
  • Normalize eigenvector_centrality by l2 norm
  • read_gml() now returns multigraphs

Networkx-1.0.1

Release date: 11 Jan 2010

See: https://networkx.lanl.gov/trac/timeline

Bug fix release for missing setup.py in manifest.

Networkx-1.0

Release date: 8 Jan 2010

See: https://networkx.lanl.gov/trac/timeline

New features

This release has sigificant changes to parts of the graph API to allow graph, node, and edge attributes. See http://networkx.lanl.gov//reference/api_changes.html

  • Update Graph, DiGraph, and MultiGraph classes to allow attributes.
  • Default edge data is now an empty dictionary (was the integer 1)
  • Difference and intersection operators
  • Average shortest path
  • A* (A-Star) algorithm
  • PageRank, HITS, and eigenvector centrality
  • Read Pajek files
  • Line graphs
  • Minimum spanning tree (Kruskal’s algorithm)
  • Dense and sparse Fruchterman-Reingold layout
  • Random clustered graph generator
  • Directed scale-free graph generator
  • Faster random regular graph generator
  • Improved edge color and label drawing with Matplotlib
  • and much more, see https://networkx.lanl.gov/trac/query?status=closed&group=milestone&milestone=networkx-1.0

Examples

  • Update to work with networkx-1.0 API
  • Graph subclass example

Networkx-0.99

Release date: 18 November 2008

See: https://networkx.lanl.gov/trac/timeline

New features

This release has sigificant changes to parts of the graph API. See http://networkx.lanl.gov//reference/api_changes.html

  • Update Graph and DiGraph classes to use weighted graphs as default Change in API for performance and code simplicity.
  • New MultiGraph and MultiDiGraph classes (replace XGraph and XDiGraph)
  • Update to use Sphinx documentation system http://networkx.lanl.gov/
  • Developer site at https://networkx.lanl.gov/trac/
  • Experimental LabeledGraph and LabeledDiGraph
  • Moved package and file layout to subdirectories.

Bug fixes

  • handle root= option to draw_graphviz correctly

Examples

  • Update to work with networkx-0.99 API
  • Drawing examples now use matplotlib.pyplot interface
  • Improved drawings in many examples
  • New examples - see http://networkx.lanl.gov/examples/

NetworkX-0.37

Release date: 17 August 2008

See: https://networkx.lanl.gov/trac/timeline

NetworkX now requires Python 2.4 or later for full functionality.

New features

  • Edge coloring and node line widths with Matplotlib drawings
  • Update pydot functions to work with pydot-1.0.2
  • Maximum-weight matching algorithm
  • Ubigraph interface for 3D OpenGL layout and drawing
  • Pajek graph file format reader and writer
  • p2g graph file format reader and writer
  • Secondary sort in topological sort

Bug fixes

  • Better edge data handling with GML writer
  • Edge betweenness fix for XGraph with default data of None
  • Handle Matplotlib version strings (allow “pre”)
  • Interface to PyGraphviz (to_agraph()) now handles parallel edges
  • Fix bug in copy from XGraph to XGraph with multiedges
  • Use SciPy sparse lil matrix format instead of coo format
  • Clear up ambiguous cases for Barabasi-Albert model
  • Better care of color maps with Matplotlib when drawing colored nodes and edges
  • Fix error handling in layout.py

Examples

  • Ubigraph examples showing 3D drawing

NetworkX-0.36

Release date: 13 January 2008

See: https://networkx.lanl.gov/trac/timeline

New features

  • GML format graph reader, tests, and example (football.py)
  • edge_betweenness() and load_betweenness()

Bug fixes

  • remove obsolete parts of pygraphviz interface
  • improve handling of Matplotlib version strings
  • write_dot() now writes parallel edges and self loops
  • is_bipartite() and bipartite_color() fixes
  • configuration model speedup using random.shuffle()
  • convert with specified nodelist now works correctly
  • vf2 isomorphism checker updates

NetworkX-0.35.1

Release date: 27 July 2007

See: https://networkx.lanl.gov/trac/timeline

Small update to fix import readwrite problem and maintain Python2.3 compatibility.

NetworkX-0.35

Release date: 22 July 2007

See: https://networkx.lanl.gov/trac/timeline

New features

  • algorithms for strongly connected components.
  • Brandes betweenness centrality algorithm (weighted and unweighted versions)
  • closeness centrality for weighted graphs
  • dfs_preorder, dfs_postorder, dfs_tree, dfs_successor, dfs_predecessor
  • readers for GraphML, LEDA, sparse6, and graph6 formats.
  • allow arguments in graphviz_layout to be passed directly to graphviz

Bug fixes

  • more detailed installation instructions
  • replaced dfs_preorder,dfs_postorder (see search.py)
  • allow initial node positions in spectral_layout
  • report no error on attempting to draw empty graph
  • report errors correctly when using tuples as nodes #114
  • handle conversions from incomplete dict-of-dict data

NetworkX-0.34

Release date: 12 April 2007

See: https://networkx.lanl.gov/trac/timeline

New features

  • benchmarks for graph classes
  • Brandes betweenness centrality algorithm
  • Dijkstra predecessor and distance algorithm
  • xslt to convert DIA graphs to NetworkX
  • number_of_edges(u,v) counts edges between nodes u and v
  • run tests with python setup_egg.py test (needs setuptools) else use python -c “import networkx; networkx.test()”
  • is_isomorphic() that uses vf2 algorithm

Bug fixes

  • speedups of neighbors()
  • simplified Dijkstra’s algorithm code
  • better exception handling for shortest paths
  • get_edge(u,v) returns None (instead of exception) if no edge u-v
  • floyd_warshall_array fixes for negative weights
  • bad G467, docs, and unittest fixes for graph atlas
  • don’t put nans in numpy or scipy sparse adjacency matrix
  • handle get_edge() exception (return None if no edge)
  • remove extra kwds arguments in many places
  • no multi counting edges in conversion to dict of lists for multigraphs
  • allow passing tuple to get_edge()
  • bad parameter order in node/edge betweenness
  • edge betweenness doesn’t fail with XGraph
  • don’t throw exceptions for nodes not in graph (silently ignore instead) in edges_* and degree_*

NetworkX-0.33

Release date: 27 November 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • draw edges with specified colormap

  • more efficient version of Floyd’s algorithm for all pairs shortest path

  • use numpy only, Numeric is deprecated

  • include tests in source package (networkx/tests)

  • include documentation in source package (doc)

  • tests can now be run with
    >>> import networkx
    >>> networkx.test()
    

Bug fixes

  • read_gpickle now works correctly with Windows
  • refactored large modules into smaller code files
  • degree(nbunch) now returns degrees in same order as nbunch
  • degree() now works for multiedges=True
  • update node_boundary and edge_boundary for efficiency
  • edited documentation for graph classes, now mostly in info.py

Examples

  • Draw edges with colormap

NetworkX-0.32

Release date: 29 September 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • Update to work with numpy-1.0x
  • Make egg usage optional: use python setup_egg.py bdist_egg to build egg
  • Generators and functions for bipartite graphs
  • Experimental classes for trees and forests
  • Support for new pygraphviz update (in nx_agraph.py) , see http://networkx.lanl.gov/pygraphviz/ for pygraphviz details

Bug fixes

  • Handle special cases correctly in triangles function
  • Typos in documentation
  • Handle special cases in shortest_path and shortest_path_length, allow cutoff parameter for maximum depth to search
  • Update examples: erdos_renyi.py, miles.py, roget,py, eigenvalues.py

Examples

  • Expected degree sequence
  • New pygraphviz interface

NetworkX-0.31

Release date: 20 July 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • arbitrary node relabeling (use relabel_nodes)
  • conversion of NetworkX graphs to/from Python dict/list types, numpy matrix or array types, and scipy_sparse_matrix types
  • generator for random graphs with given expected degree sequence

Bug fixes

  • Allow drawing graphs with no edges using pylab
  • Use faster heapq in dijkstra
  • Don’t complain if X windows is not available

Examples

  • update drawing examples

NetworkX-0.30

Release date: 23 June 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • update to work with Python 2.5
  • bidirectional version of shortest_path and Dijkstra
  • single_source_shortest_path and all_pairs_shortest_path
  • s-metric and experimental code to generate maximal s-metric graph
  • double_edge_swap and connected_double_edge_swap
  • Floyd’s algorithm for all pairs shortest path
  • read and write unicode graph data to text files
  • read and write YAML format text files, http://yaml.org

Bug fixes

  • speed improvements (faster version of subgraph, is_connected)
  • added cumulative distribution and modified discrete distribution utilities
  • report error if DiGraphs are sent to connected_components routines
  • removed with_labels keywords for many functions where it was causing confusion
  • function name changes in shortest_path routines
  • saner internal handling of nbunch (node bunches), raise an exception if an nbunch isn’t a node or iterable
  • better keyword handling in io.py allows reading multiple graphs
  • don’t mix Numeric and numpy arrays in graph layouts and drawing
  • avoid automatically rescaling matplotlib axes when redrawing graph layout

Examples

  • unicode node labels

NetworkX-0.29

Release date: 28 April 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • Algorithms for betweeenness, eigenvalues, eigenvectors, and spectral projection for threshold graphs
  • Use numpy when available
  • dense_gnm_random_graph generator
  • Generators for some directed graphs: GN, GNR, and GNC by Krapivsky and Redner
  • Grid graph generators now label by index tuples. Helper functions for manipulating labels.
  • relabel_nodes_with_function

Bug fixes

  • Betweenness centrality now correctly uses Brandes definition and has normalization option outside main loop
  • Empty graph now labled as empty_graph(n)
  • shortest_path_length used python2.4 generator feature
  • degree_sequence_tree off by one error caused nonconsecutive labeling
  • periodic_grid_2d_graph removed in favor of grid_2d_graph with periodic=True

NetworkX-0.28

Release date: 13 March 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • Option to construct Laplacian with rows and columns in specified order
  • Option in convert_node_labels_to_integers to use sorted order
  • predecessor(G,n) function that returns dictionary of nodes with predecessors from breadth-first search of G starting at node n. https://networkx.lanl.gov/trac/ticket/26

Examples

Bug fixes

  • Adjusted names for random graphs.
    • erdos_renyi_graph=binomial_graph=gnp_graph: n nodes with edge probability p
    • gnm_graph: n nodes and m edges
    • fast_gnp_random_graph: gnp for sparse graphs (small p)
  • Documentation contains correct spelling of Barabási, Bollobás, Erdős, and Rényi in UTF-8 encoding

  • Increased speed of connected_components and related functions by using faster BFS algorithm in networkx.paths https://networkx.lanl.gov/trac/ticket/27

  • XGraph and XDiGraph with multiedges=True produced error on delete_edge

  • Cleaned up docstring errors

  • Normalize names of some graphs to produce strings that represent calling sequence

NetworkX-0.27

Release date: 5 February 2006

See: https://networkx.lanl.gov/trac/timeline

New features

  • sparse_binomial_graph: faster graph generator for sparse random graphs
  • read/write routines in io.py now handle XGraph() type and gzip and bzip2 files
  • optional mapping of type for read/write routine to allow on-the-fly conversion of node and edge datatype on read
  • Substantial changes related to digraphs and definitions of neighbors() and edges(). For digraphs edges=out_edges. Neighbors now returns a list of neighboring nodes with possible duplicates for graphs with parallel edges See https://networkx.lanl.gov/trac/ticket/24
  • Addition of out_edges, in_edges and corresponding out_neighbors and in_neighbors for digraphs. For digraphs edges=out_edges.

Examples

  • Minard’s data for Napoleon’s Russian campaign

Bug fixes

  • XGraph(multiedges=True) returns a copy of the list of edges for get_edge()

NetworkX-0.26

Release date: 6 January 2006

New features

  • Simpler interface to drawing with pylab
  • G.info(node=None) function returns short information about graph or node
  • adj_matrix now takes optional nodelist to force ordering of rows/columns in matrix
  • optional pygraphviz and pydot interface to graphviz is now callable as “graphviz” with pygraphviz preferred. Use draw_graphviz(G).

Examples

  • Several new examples showing how draw to graphs with various properties of nodes, edges, and labels

Bug fixes

  • Default data type for all graphs is now None (was the integer 1)
  • add_nodes_from now won’t delete edges if nodes added already exist
  • Added missing names to generated graphs
  • Indexes for nodes in graphs start at zero by default (was 1)

NetworkX-0.25

Release date: 5 December 2005

New features

Examples

  • Email example shows how to use XDiGraph with Python objects as edge data

Documentation

  • Reformat menu, minor changes to Readme, better stylesheet

Bug fixes

  • use create_using= instead of result= keywords for graph types in all cases
  • missing weights for degree 0 and 1 nodes in clustering
  • configuration model now uses XGraph, returns graph with identical degree sequence as input sequence
  • fixed dijstra priority queue
  • fixed non-recursive toposort and is_directed_acyclic graph

NetworkX-0.24

Release date: 20 August 2005

Bug fixes

  • Update of dijstra algorithm code
  • dfs_successor now calls proper search method
  • Changed to list compehension in DiGraph.reverse() for python2.3 compatibility
  • Barabasi-Albert graph generator fixed
  • Attempt to add self loop should add node even if parallel edges not allowed

NetworkX-0.23

Release date: 14 July 2005

The NetworkX web locations have changed:

http://networkx.lanl.gov/ - main documentation site http://networkx.lanl.gov/svn/ - subversion source code repository https://networkx.lanl.gov/trac/ - bug tracking and info

Important Change

The naming conventions in NetworkX have changed. The package name “NX” is now “networkx”.

The suggested ways to import the NetworkX package are

  • import networkx
  • import networkx as NX
  • from networkx import *

New features

  • DiGraph reverse

  • Graph generators
    • watts_strogatz_graph now does rewiring method
    • old watts_strogatz_graph->newman_watts_strogatz_graph

Examples

Documentation

Bug fixes

  • Fixed logic in io.py for reading DiGraphs.
  • Path based centrality measures (betweenness, closeness) modified so they work on graphs that are not connected and produce the same result as if each connected component were considered separately.

NetworkX-0.22

Release date: 17 June 2005

New features

  • Topological sort, testing for directed acyclic graphs (DAGs)

  • Dikjstra’s algorithm for shortest paths in weighted graphs

  • Multidimensional layout with dim=n for drawing

  • 3d rendering demonstration with vtk

  • Graph generators
    • random_powerlaw_tree
    • dorogovtsev_goltsev_mendes_graph

Examples

  • Kevin Bacon movie actor graph: Examples/kevin_bacon.py
  • Compute eigenvalues of graph Laplacian: Examples/eigenvalues.py
  • Atlas of small graphs: Examples/atlas.py

Documentation

  • Rewrite of setup scripts to install documentation and tests in documentation directory specified

Bug fixes

  • Handle calls to edges() with non-node, non-iterable items.
  • truncated_tetrahedral_graph was just plain wrong
  • Speedup of betweenness_centrality code
  • bfs_path_length now returns correct lengths
  • Catch error if target of search not in connected component of source
  • Code cleanup to label internal functions with _name
  • Changed import statement lines to always use “import NX” to protect name-spaces
  • Other minor bug-fixes and testing added