ITensor / ITensor/NamedGraphs.jl

Throw an error if `named_hexagonal_lattice_graph(n, m; periodic = true)` is called with `n` or `m` = 2

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Dominant language
Julia
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10
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5
Avg merge
6h 43m
Merged PRs (30d)
17

Description

We should throw an error if named_hexagonal_lattice_graph(n, m; periodic = true) is called with n =2 or m = 2 because this will output a graph that essentially is a ladder (with shortest loop size 4) and resembles nothing like a hexagonal graph so may be misleading to the user.

This is likely an issue implicitly tied to the hexagonal lattice itself (hexagonal_lattice_graph for Networkx in Python also has the same output).

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Research direction

Start at named_hexagonal_lattice_graph(n, m; periodic = true) and inspect how periodic dimensions are validated. Add the requested error for n or m equal to 2, then verify that those inputs no longer produce the misleading ladder-shaped graph.

Written by the indexing model from the issue text.

Assessment

Tech stack
julia
Domain
backend
Issue type
Bug
Difficulty
2/5
Estimated time
1-3 hours
Activity status
Stale
Clarity
Clearly specified
Newbie friendliness
52/100

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