[GAP Forum] Question concerning the gap function NameOfEquivalentLibraryCharacterTable

[Bernhard Boehmler]

Dear GAP Forum,

I am running gap 4.10.0 inside sage 8.6 and get an error message after

gap> G:=SymmetricGroup(7);
Sym( [ 1 .. 7 ] )
gap> ct:=CharacterTable(G);
CharacterTable( Sym( [ 1 .. 7 ] ) )
gap> NameOfEquivalentLibraryCharacterTable(ct);

(the error message is printed below).

But, when I use my old stand-alone version of gap (GAP 4.9.2 of
04-Jul-2018) it works (and "A7.2" is returned).

I have not installed the Browse package in gap inside sage (I'm not sure,
if NameOfEquivalentLibraryCharacterTable requires this).

I would be grateful for any help.

Thanks in advance.

Sincerely yours,
Bernhard Boehmler





boehmler at mahlzahn:~$ sage
┌────────────────────────────────────────────────────────────────────┐
│ SageMath version 8.6, Release Date: 2019-01-15                     │
│ Using Python 2.7.15. Type "help()" for help.                       │
└────────────────────────────────────────────────────────────────────┘
sage: gap.console()
 ┌───────┐   GAP 4.10.0 of 01-Nov-2018
 │  GAP  │   https://www.gap-system.org
 └───────┘   Architecture: x86_64-pc-linux-gnu-default64
 Configuration:  gmp 6.0.0, readline
 Loading the library and packages ...
 Packages:   AClib 1.3.1, Alnuth 3.1.0, AtlasRep 1.5.1, AutoDoc 2018.09.20,
             AutPGrp 1.10, CRISP 1.4.4, Cryst 4.1.18, CrystCat 1.1.8,
             CTblLib 1.2.2, FactInt 1.6.2, FGA 1.4.0, GAPDoc 1.6.2,
             IRREDSOL 1.4, LAGUNA 3.9.0, Polenta 1.3.8, Polycyclic 2.14,
             PrimGrp 3.3.2, RadiRoot 2.8, ResClasses 4.7.1, SmallGrp 1.3,
             Sophus 1.24, TomLib 1.2.7, TransGrp 2.0.4, utils 0.59
 Try '??help' for help. See also '?copyright', '?cite' and '?authors'
gap> G:=SymmetricGroup(7);
Sym( [ 1 .. 7 ] )
gap> ct:=CharacterTable(G);
CharacterTable( Sym( [ 1 .. 7 ] ) )
gap> NameOfEquivalentLibraryCharacterTable(ct);
Error, no method found! For debugging hints type ?Recovery from
NoMethodFound
Error, no 1st choice method found for `Length' on 1 arguments at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/methsel2.g:
250 called from
Length( gens
 ) at /home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/
grp.gi:437\
2 called from
MakeGroupyType( FamilyObj( gens ),
 IsGroup and IsAttributeStoringRep and HasIsEmpty
    and HasGeneratorsOfMagmaWithInverses and HasOne, gens, id, true
 ) at /home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/
grp.gi:442\
4 called from
GroupByGenerators( libtbl.AutomorphismsOfTable, ()
 ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/pkg/ctbllib/ga\
p4/ctadmin.tbi:815 called from
CharacterTableFromLibrary( str
 ) at /home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/
ctbl.gi:40\
99 called from
CharacterTable( val
 ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/pkg/ctbllib/ga\
p4/ctadmin.tbi:2137 called from
...  at *stdin*:3
type 'quit;' to quit to outer loop
brk>
gap> NamesOfEquivalentLibraryCharacterTables(ct);
Error, no method found! For debugging hints type ?Recovery from
NoMethodFound
Error, no 1st choice method found for `Length' on 1 arguments at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/methsel2.g:250
called from
Length( gens ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/grp.gi:4372
called from
MakeGroupyType( FamilyObj( gens ), IsGroup and IsAttributeStoringRep and
HasIsEmpty and HasGeneratorsOfMagmaWithInverses and HasOne, gens, id, true
 ) at /home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/
grp.gi:4424 called from
GroupByGenerators( libtbl.AutomorphismsOfTable, () ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/pkg/ctbllib/gap4/ctadmin.tbi:815
called from
CharacterTableFromLibrary( str ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/lib/ctbl.gi:4099
called from
CharacterTable( val ) at
/home/boehmler/Schreibtisch/Drarbeit/SAGE/local/share/gap/pkg/ctbllib/gap4/ctadmin.tbi:2137
called from
...  at *stdin*:3
type 'quit;' to quit to outer loop
brk>
gap> CT:=CharacterTable("S7");
CharacterTable( "A7.2" )
gap> TransformingPermutationsCharacterTables(CT,ct);
rec( columns := (2,3,5,10,4,8,15,11,9)(6,12)(13,14), group := Group(()),
rows := (1,15,6,13,7,3,14,10,12,8,11,5,9,4,2) )
gap>