grapharray.classes.BaseGraph

class grapharray.classes.BaseGraph(incoming_graph_data=None, **attr)

Directed graph object on which arrays are defined.

This object works (1) as a key to check if variables are defined on the same network and (2) as a holder of the orders of nodes and edges. Note that this object itself does not contain any variables.

__init__(incoming_graph_data=None, **attr)

Initialize a graph with edges, name, or graph attributes.

Parameters

• incoming_graph_data (input graph (optional, default: None)) – Data to initialize graph. If None (default) an empty graph is created. The data can be an edge list, or any NetworkX graph object. If the corresponding optional Python packages are installed the data can also be a NumPy matrix or 2d ndarray, a SciPy sparse matrix, or a PyGraphviz graph.

• attr (keyword arguments, optional (default= no attributes)) – Attributes to add to graph as key=value pairs.

See also

convert

Examples

>>> G = nx.Graph()  # or DiGraph, MultiGraph, MultiDiGraph, etc
>>> G = nx.Graph(name="my graph")
>>> e = [(1, 2), (2, 3), (3, 4)]  # list of edges
>>> G = nx.Graph(e)

Arbitrary graph attribute pairs (key=value) may be assigned

>>> G = nx.Graph(e, day="Friday")
>>> G.graph
{'day': 'Friday'}

Methods

__init__([incoming_graph_data])	Initialize a graph with edges, name, or graph attributes.
add_edge(u_of_edge, v_of_edge, **attr)	Add an edge between u and v.
add_edges_from(ebunch_to_add, **attr)	Add all the edges in ebunch_to_add.
add_node(node_for_adding, **attr)	Add a single node node_for_adding and update node attributes.
add_nodes_from(nodes_for_adding, **attr)	Add multiple nodes.
add_weighted_edges_from(ebunch_to_add[, weight])	Add weighted edges in ebunch_to_add with specified weight attr
adjacency()	Returns an iterator over (node, adjacency dict) tuples for all nodes.
clear()	Remove all nodes and edges from the graph.
clear_edges()	Remove all edges from the graph without altering nodes.
copy([as_view])	Returns a copy of the graph.
edge_subgraph(edges)	Returns the subgraph induced by the specified edges.
freeze()	Freeze the graph and map between nodes / edges and array indices
get_edge_data(u, v[, default])	Returns the attribute dictionary associated with edge (u, v).
has_edge(u, v)	Returns True if the edge (u, v) is in the graph.
has_node(n)	Returns True if the graph contains the node n.
has_predecessor(u, v)	Returns True if node u has predecessor v.
has_successor(u, v)	Returns True if node u has successor v.
is_directed()	Returns True if graph is directed, False otherwise.
is_multigraph()	Returns True if graph is a multigraph, False otherwise.
nbunch_iter([nbunch])	Returns an iterator over nodes contained in nbunch that are also in the graph.
neighbors(n)	Returns an iterator over successor nodes of n.
number_of_edges([u, v])	Returns the number of edges between two nodes.
number_of_nodes()	Returns the number of nodes in the graph.
order()	Returns the number of nodes in the graph.
predecessors(n)	Returns an iterator over predecessor nodes of n.
remove_edge(u, v)	Remove the edge between u and v.
remove_edges_from(ebunch)	Remove all edges specified in ebunch.
remove_node(n)	Remove node n.
remove_nodes_from(nodes)	Remove multiple nodes.
reverse([copy])	Returns the reverse of the graph.
size([weight])	Returns the number of edges or total of all edge weights.
subgraph(nodes)	Returns a SubGraph view of the subgraph induced on nodes.
successors(n)	Returns an iterator over successor nodes of n.
to_directed([as_view])	Returns a directed representation of the graph.
to_directed_class()	Returns the class to use for empty directed copies.
to_undirected([reciprocal, as_view])	Returns an undirected representation of the digraph.
to_undirected_class()	Returns the class to use for empty undirected copies.
update([edges, nodes])	Update the graph using nodes/edges/graphs as input.

Attributes

adj	Graph adjacency object holding the neighbors of each node.
degree	A DegreeView for the Graph as G.degree or G.degree().
edge_to_index	Correspondence between edges and array indices
edges	An OutEdgeView of the DiGraph as G.edges or G.edges().
in_degree	An InDegreeView for (node, in_degree) or in_degree for single node.
in_edges	An InEdgeView of the Graph as G.in_edges or G.in_edges().
name	String identifier of the graph.
node_to_index	Correspondence between nodes and array indices
nodes	A NodeView of the Graph as G.nodes or G.nodes().
out_degree	An OutDegreeView for (node, out_degree)
out_edges	An OutEdgeView of the DiGraph as G.edges or G.edges().
pred	Graph adjacency object holding the predecessors of each node.
succ	Graph adjacency object holding the successors of each node.