retworkx.generators.path_graph¶
- path_graph(num_nodes=None, weights=None, multigraph=True, /)¶
Generate an undirected path graph
- Parameters
num_node (int) – The number of nodes to generate the graph with. Node weights will be None if this is specified. If both
num_node
andweights
are set this will be ignored andweights
will be used.weights (list) – A list of node weights, the first element in the list will be the center node of the path graph. If both
num_node
andweights
are set this will be ignored andweights
will be used.multigraph (bool) – When set to False the output
PyGraph
object will not be not be a multigraph and won’t allow parallel edges to be added. Instead calls which would create a parallel edge will update the existing edge.
- Returns
The generated path graph
- Return type
- Raises
IndexError – If neither
num_nodes
orweights
are specified
import os import tempfile import pydot from PIL import Image import retworkx.generators graph = retworkx.generators.path_graph(10) dot_str = graph.to_dot( lambda node: dict( color='black', fillcolor='lightblue', style='filled')) dot = pydot.graph_from_dot_data(dot_str)[0] with tempfile.TemporaryDirectory() as tmpdirname: tmp_path = os.path.join(tmpdirname, 'dag.png') dot.write_png(tmp_path) image = Image.open(tmp_path) os.remove(tmp_path) image