[GAP Forum] Question concerning the gap function NameOfEquivalentLibraryCharacterTable

[Bernhard Boehmler]

Dear Thomas Breuer, dear GAP Forum,

thank you very much for the very fast reply.

Your workaround works very well (it seems to be a bit more memory consuming
when compared to NameOfEquivalentLibraryCharacterTable in the gap 4.9.2
version, but, anyway),

thank you very much for the help! :-)

Sincerely yours,
Bernhard Boehmler




On Fri, Mar 1, 2019 at 6:10 PM Thomas Breuer <sam at math.rwth-aachen.de>
wrote:

> Dear Bernhard, dear Forum,
>
> this problem is new in GAP 4.10.0,
> I hope it will disappear in the next GAP version.
>
> As a temporary remedy, I propose either not to use GAP 4.10.0
> or to read the following piece of code into the GAP session
> after startup.
>
>     InstallMethod( GroupByGenerators,
>         [ IsGroup, IsMultiplicativeElementWithInverse ],
>         function( G, id )
>         return GroupWithGenerators( GeneratorsOfGroup( G ), id );
>         end );
>
> I am sorry for the inconveniences.
>
> All the best,
> Thomas
>
>
> On Fri, Mar 01, 2019 at 05:44:20PM +0100, Bernhard Boehmler wrote:
> > 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>
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