Opened 20 months ago
Closed 19 months ago
#25994 closed defect (fixed)
Blocks_and_cut_vertices - bug with directed graphs and Boost interface
Reported by: | meghanamreddy | Owned by: | |
---|---|---|---|
Priority: | minor | Milestone: | sage-8.4 |
Component: | graph theory | Keywords: | connectivity, biconnected components, boost, bc tree, gsoc2018 |
Cc: | dcoudert, dimpase | Merged in: | |
Authors: | Meghana M Reddy | Reviewers: | David Coudert |
Report Upstream: | N/A | Work issues: | |
Branch: | 7c76517 (Commits) | Commit: | 7c7651780e24db88d8a8be7063b9775e10f52d5e |
Dependencies: | Stopgaps: |
Description
While using the Boost interface to compute the blocks and cut vertices, the output is wrong if the input is a directed graph.
sage: from sage.graphs.connectivity import blocks_and_cut_vertices sage: rings = graphs.CycleGraph(10) sage: rings.merge_vertices([0, 5]) sage: blocks_and_cut_vertices(rings, algorithm="Tarjan_Boost") ([[0, 1, 4, 2, 3], [0, 6, 9, 7, 8]], [0])
sage: from sage.graphs.connectivity import blocks_and_cut_vertices sage: rings = graphs.CycleGraph(10) sage: rings.merge_vertices([0, 5]) sage: rings = rings.to_directed() sage: blocks_and_cut_vertices(rings, algorithm="Tarjan_Boost") ([[0, 1, 4, 2, 3, 6, 7, 8, 9], [0, 6, 9, 7, 8]], [0, 9, 8, 6, 7])
If the input graph is a directed graph, the blocks and cut vertices are computed on the underlying simple graph.
Change History (6)
comment:1 Changed 20 months ago by
- Branch set to u/meghanamreddy/25994_boost_interface
comment:2 Changed 20 months ago by
- Commit set to 7c7651780e24db88d8a8be7063b9775e10f52d5e
comment:3 Changed 20 months ago by
- Reviewers set to David Coudert
Is this patch ready for review ? if so, set it to needs review
.
comment:4 Changed 20 months ago by
- Status changed from new to needs_review
comment:6 Changed 19 months ago by
- Branch changed from u/meghanamreddy/25994_boost_interface to 7c7651780e24db88d8a8be7063b9775e10f52d5e
- Resolution set to fixed
- Status changed from positive_review to closed
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Branch pushed to git repo; I updated commit sha1. New commits:
Fixed the bug and added an example related to the bug.