Opened 5 years ago
Closed 5 years ago
#16741 closed defect (fixed)
Bug in IncidenceStructure.automorphism_group when the ground set consists of pairs
Reported by:  ncohen  Owned by:  

Priority:  major  Milestone:  sage6.3 
Component:  combinatorial designs  Keywords:  
Cc:  vdelecroix, knsam, dimpase  Merged in:  
Authors:  Nathann Cohen  Reviewers:  Dima Pasechnik 
Report Upstream:  N/A  Work issues:  
Branch:  aad8ee5 (Commits)  Commit:  
Dependencies:  Stopgaps: 
Description (last modified by )
Before
sage: designs.IncidenceStructure([[(1,2),(3,4)]]).automorphism_group() ... ValueError: Invalid permutation vector: [(3, 4), (1, 2)]
After
sage: designs.IncidenceStructure([[(1,2),(3,4)]]).automorphism_group() Permutation Group with generators [((1,2),(3,4))]
Change History (11)
comment:1 Changed 5 years ago by
 Branch set to u/ncohen/16741
 Description modified (diff)
 Status changed from new to needs_review
comment:2 Changed 5 years ago by
 Commit set to aad8ee5de146babdc8873c0dd7fa64340e064590
Branch pushed to git repo; I updated commit sha1. New commits:
aad8ee5  trac #16741: Bug in IncidenceStructure.relabel when the ground set consists of pairs

comment:3 Changed 5 years ago by
when I read the permgroups code, I think: "FORTRAN" :)
comment:4 Changed 5 years ago by
 Summary changed from Bug in IncidenceStructure.relabel when the ground set consists of pairs to Bug in IncidenceStructure.automorphism_group when the ground set consists of pairs
comment:6 Changed 5 years ago by
Thaaaaaaaannks !
Nathann
comment:8 Changed 5 years ago by
 Reviewers set to Dima Pasechnik
 Status changed from needs_work to positive_review
comment:9 Changed 5 years ago by
 Branch changed from u/ncohen/16741 to aad8ee5de146babdc8873c0dd7fa64340e064590
 Resolution set to fixed
 Status changed from positive_review to closed
comment:10 Changed 5 years ago by
 Commit aad8ee5de146babdc8873c0dd7fa64340e064590 deleted
 Resolution fixed deleted
 Status changed from closed to new
PDF docs:
LaTeX Warning: Hyper reference `sage/combinat/designs/incidence_structures:sage .combinat.designs.incidence_structures.IncidenceStructure.is_t_design' on page 244 undefined on input line 20504. [244] [245] [246] ! Double subscript. l.20746 ...tion, see the ;wikipedia:$Packing_in_a_ hypergraph$.
comment:11 Changed 5 years ago by
 Resolution set to fixed
 Status changed from new to closed
wrong ticket
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This really was triky to fix. The permutation code tries to handle several incompatible input i.e. tries to guess whether input is given in list notation or cycle notation, and guesses that from the type list/tuple of input.
Plus some permutation code WANTS permutations on 1...n, others on 0,...,n1 and others handle everything...