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Inconsistent existence of coordinate systems in node attributes

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
python
Domain
data

Research direction

Start at the pegasus_graph entry point and compare node attributes for coordinates=False, coordinates=True, and nice_coordinates=True. Clarify the intended invariant for linear_index and pegasus_index, then add regression coverage showing consistent attributes across these initialization modes.

Written by the indexing model from the issue text.

Description

Graph node attributes contain inconsistent node attributes depending on initialization.
This makes downstream code unnecessarily complex and unreliable

Example:

import dwave_networkx as dnx

P = dnx.pegasus_graph(6, coordinates=False)
print(P.nodes[20])

P = dnx.pegasus_graph(6, coordinates=True)
print(P.nodes[0, 0, 4, 0])

P = dnx.pegasus_graph(6, nice_coordinates=True)
print(P.nodes[0, 0, 0, 0, 0])

outputs

{'pegasus_index': (0, 0, 4, 0)}
{'linear_index': 20}
{'linear_index': 20, 'pegasus_index': (0, 0, 4, 0)}
Dominant language
Python
Stars
95
Forks
62
Avg merge
8h 49m
Merged PRs (30d)
3

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