[sage-devel] Re: TypeError: unsupported operand parent(s) for *: <(1,3)(2,4), (1,4,3,2)> and S4
> use > S4(S4.subgroups()[19][1]) * S4[1] > Thank you. That makes perfect sense. This does not bother me anymore since I found that pre-casting all subgroup-elements to S4 accelerates my work a lot. (i.e. S4subgroups=[ [S4(h) for h in H] for H in S4.subgroups()] ) But it is still interesting to see if this is an unintentional bug in, say, the coercion model and can be fixed. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
[sage-devel] Re: TypeError: unsupported operand parent(s) for *: <(1,3)(2,4), (1,4,3,2)> and S4
I'm not sure if Sage can always tell, if you multiply an element of a
subgroup by an element of the larger group, that the result should make
sense and lie in the larger group. You should be able to fix this by
forcing Sage to consider the subgroup element as lying in the larger group:
rather than
S4.subgroups()[19][1] * S4[1]
use
S4(S4.subgroups()[19][1]) * S4[1]
On Monday, January 29, 2018 at 3:20:16 PM UTC-8, Hsin-Po Wang wrote:
>
> The following code
>
> sage: S4=SymmetricGroup(*4*)
>
> sage: S4.subgroups()[*19*][*1*]*S4[*1*]
>
> raises an error
>
> TypeError: unsupported operand parent(s) for *: 'Subgroup of (Symmetric
> group of order 4! as a permutation group) generated by [(1,3)(2,4),
> (1,4,3,2)]' and 'Symmetric group of order 4! as a permutation group'
>
> I am not sure what exactly happened but this is quite peculiar. Among al
> 30 subgroups of S4 only the 19th and 27th raise errors.
>
> sage: *for* Sid,S in enumerate(S4.subgroups()):
>
> : *for* s in S:
>
> : *for* g in S4:
>
> : *try*:
>
> : sg=s*g
>
> : *except* *TypeError*:
>
> : #print'For {}-th subgroup: {}*{} is
> bad'.format(Sid,s,g)
>
> : *print* Sid,
>
> :
>
>
> 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
> 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
> 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
> 19 19 19 19 19 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
> 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
> 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
> 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
> 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
> 27 27 27 27 27 27 27 27
>
> I am using Sage 8.0.0 on macOS 10.13.2
>
>
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[sage-devel] TypeError: unsupported operand parent(s) for *: <(1,3)(2,4), (1,4,3,2)> and S4
The following code
sage: S4=SymmetricGroup(*4*)
sage: S4.subgroups()[*19*][*1*]*S4[*1*]
raises an error
TypeError: unsupported operand parent(s) for *: 'Subgroup of (Symmetric
group of order 4! as a permutation group) generated by [(1,3)(2,4),
(1,4,3,2)]' and 'Symmetric group of order 4! as a permutation group'
I am not sure what exactly happened but this is quite peculiar. Among al 30
subgroups of S4 only the 19th and 27th raise errors.
sage: *for* Sid,S in enumerate(S4.subgroups()):
: *for* s in S:
: *for* g in S4:
: *try*:
: sg=s*g
: *except* *TypeError*:
: #print'For {}-th subgroup: {}*{} is
bad'.format(Sid,s,g)
: *print* Sid,
:
19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19 19
19 19 19 19 19 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27 27
27 27 27 27 27 27 27 27
I am using Sage 8.0.0 on macOS 10.13.2
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[sage-devel] Re: Live documentation, the return (#24593 needs review)
Great news, Nicolas! In trying this, I would only point out that the "Activate" button was not at all obvious, and that it's not obvious when a cell has, in fact, been evaluated. That was a nice feature it would be worth emulating. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
