I found a way to pass options to functions in gap (looking at the use of
function_factory in permgroup.py); I guess it can be improved and I do not
know how to make it more useful. I put an example. In LINS package there is
a function called LowIndexNormalSubs; without options, applied to a group G
and a number n, it gives all the normal subgroups of G of index at most n;
if one is only interested in n-index subgroups one has to pass the option
allSubgroups as false; if only these subgroups are needed it is much faster
than computing all of them and filter. The following seams to work
low_index_normal_subgroups_exact = libgap.function_factory("""function(G,
n) return LowIndexNormalSubs(G, n : allSubgroups := false); end; """)
El sábado, 29 de marzo de 2025 a las 10:24:29 UTC+1, enriqu...@gmail.com
escribió:
> Thank you. I have a couple of installations, one with system gap (with
> package browser), the other one gap is inside sage. Loading ctbllib is
> possible in both cases but it only loads browse in the first case. Anyway,
> it seems better to exclude xgap and browse (which do not seem very useful
> in sage at first sight).
> Do you have any ideas about how to solve the issue concerning passing
> options? Enrique.
>
> El jueves, 27 de marzo de 2025 a las 8:36:42 UTC+1, Antonio Rojas escribió:
>
>> The browse package is also causing trouble, simply having it installed
>> makes doctesting hang (as it is automatically loaded by the standard
>> ctbllib package if present).
>>
>> El jueves, 27 de marzo de 2025 a las 1:22:09 UTC+1, François Bissey
>> escribió:
>>
>>> the xgap package was the guilty party causing trouble if my memory
>>> serves me right from all those years ago. It was automatically loaded too.
>>> I cannot remember how I figured it out now. xgap would not load by
>>> itself these days, if it still exists.
>>>
>>> François
>>>
>>>
>>> On 27/03/2025 09:19, enriqu...@gmail.com wrote:
>>>
>>> I have opened https://github.com/sagemath/sage/pull/39783. The
>>> immediate goal is to add a recent gap package. There are several points
>>> tangentially related with this PR that I wanted to share to the community:
>>>
>>> 1. Is there a reason to do not add some other packages? Long time
>>> ago, I think someone told me that they may interfere with other sage
>>> packages, but it is not clear to me since they must be loaded
>>> explicitely.
>>> 2. The compilation of gap_packages takes quite a while. Taking out
>>> sdh_make
>>> -j1 in spkg-install.in allows to compile in parallel each packages,
>>> but I wonder if there was a reason to avoid parallelism. In the same
>>> ideas,
>>> since there are several packages to be built, it could be a good idea to
>>> allow parallelism at the level of packages, but I do not how to do it.
>>> 3. The third one is related with the use of gap functions. One
>>> option is to add more functions to gap_functions.py, but I do not know
>>> if
>>> adding too much functions may affect to the memory. A second option is
>>> to
>>> use libgap.function_factory; it is OK. My issue is how to pass options
>>> to
>>> gap functions. I have not found how to do it. In order to use
>>> libgap.eval,
>>> I do not know for example how to produce a gap string from a sage group.
>>>
>>> Thanks, Enrique.
>>>
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>>>
>>>
>>>
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