Thanks!
El domingo, 25 de diciembre de 2016, 0:40:43 (UTC+1), Dima Pasechnik
escribió:
>
>
>
> On Saturday, December 24, 2016 at 11:20:32 PM UTC, Dima Pasechnik wrote:
>>
>>
>>
>> On Saturday, December 24, 2016 at 3:38:43 PM UTC, Enrique Artal wrote:
>>>
>>> I need to use a gap package which is not installed by sage, namely nq. I
>>> have been able to install it using wiki instructions and I can use it in a
>>> gap session inside sage: e.g.,
>>>
>>> LowerCentralFactors(FreeGroup(1),1);
>>>
>>> after the package has been loaded. In a sage session the following code
>>> works
>>>
>>> gap_reset_workspace()
>>> gap.LoadPackage('"nq"')
>>> F0=gap.FreeGroup(1)
>>> gap.LowerCentralFactors(F0,1)
>>>
>>> but not the following one
>>>
>>> gap.LowerCentralFactors(FreeGroup(1).gap(),1)
>>>
>>
>> I'd suggest using libgap. rather than gap., in particular as Sage's
>> FreeGroup is implemented using libgap
>> interface. So the last command needs to cross from GAP to libGAP
>> interface, and this might be flaky.
>>
>
> indeed, the following works (afer installing nq):
>
> sage: libgap.LowerCentralFactors(FreeGroup(1),1)
> [ [ 0 ] ]
> sage: libgap.LoadPackage('nq') # single ' here!
> true
> sage: F0=libgap.FreeGroup(1)
> sage: libgap. (F0,1)
> [ [ 0 ] ]
> sage: libgap.LowerCentralFactors(FreeGroup(1),1)
> [ [ 0 ] ]
>
> To make this work you will need to edit the file
> SAGE_ROOT/src/sage/libs/gap/gap_functions.py
> and add the line
>
> 'LowerCentralFactors',
>
> into the long list of GAP functions there.
> (And probably more functions from the package
> need to be added to be callable this way)
>
> we will need to automate this at some point...
>
> Don't forget to run 'sage -b' for this change to take effect.
>
> HTH
> Dima
>
>
>>
>>
>>
>>>
>>> Thanks, Enrique
>>>
>>>
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