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TransitiveGroup(1,1) fails #797

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ChrisJefferson opened this issue May 20, 2016 · 3 comments
Closed

TransitiveGroup(1,1) fails #797

ChrisJefferson opened this issue May 20, 2016 · 3 comments
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@ChrisJefferson
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ChrisJefferson commented May 20, 2016

Observed behaviour

gap> NrTransitiveGroups(1);
1
gap> TransitiveGroup(1,1);
Error, List Element: <list>[1] must have an assigned value in
  l[5] := BlistStringDecode( l[5], TRANSPARTNUM[deg] - 1 ); at /Users/caj/reps/gap/gap/trans/trans.grp:323 called from
TRANSProperties( deg, num ) at /Users/caj/reps/gap/gap/trans/trans.grp:355 called from
<function "TransitiveGroup">( <arguments> )
 called from read-eval loop at *stdin*:10
you can 'return;' after assigning a value

Expected behaviour

I get the transitive group on one point (the identity group), or return fail for NrTransitiveGroups(1)

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GAP v4.8.3-643-g3460711-dirty of 2016-05-11 09:25:22 (BST)

This at least hasn't worked since 4.7.2

@hulpke
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hulpke commented May 23, 2016

The transitive group of degree 1 is always awkward, as the trivial group is in fact transitive of degree 0. Thus my inclination would be to return 0 (or fail).

hulpke added a commit to hulpke/gap that referenced this issue May 31, 2016
hulpke added a commit to hulpke/gap that referenced this issue May 31, 2016
@hulpke
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hulpke commented May 31, 2016

This is corrected in my `fixes' branch and will go in stable the next time I merge.

@olexandr-konovalov
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@hulpke - thanks : only suggest to wait for GAP 4.8.4 which should be there in a couple of days....

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3 participants