[GAP Forum] Persistant storage of attributes

[Alexander Konovalov]

Dear all,

In the OpenDreamKit project (https://opendreamkit.org/), Michael Torpey 
and Markus Pfeiffer developed a package called "Memoisation": it is not 
(yet?) redistributed with GAP, so you will have to get it from its webpage:

https://gap-packages.github.io/Memoisation/

It seems to me that it may be helpful to Bob. I am CCing Michael who may
be able to provide further help.

Best wishes
Alexander

> On 29 Jun 2020, at 17:26, Hulpke,Alexander <Alexander.Hulpke at colostate.edu> wrote:
> 
> Dear Forum, Dear Bob Heffernan,
> 
>> What I would really like to do is set attributes for groups in the small
>> groups library in such a way that this information persists between
>> sessions.
> 
> There is no such feature in the small group library (or more general in GAP beyond saving workspaces, which will be version specific). You would have to create your own scheme, say by wring out files (such as -- assuming MacOS or Unix for the file names --
> 
> PrintTo("/Users/myname/mydatabase","database:=",database,";\n");
> 
> ) of basic data (lists, integers -- objects such as groups will not store all their attributes) and reading them in again in the next session, maybe with some added protection to avoid data loss if errors occur:
> 
> Exec("mv /Users/myname/mydatabase /Users/myname/mydatabase.old");
> PrintTo("/Users/myname/mydatabase.tmp","database:=",database,";\n");
> Exec("mv /Users/myname/mydatabase.tmp /Users/myname/mydatabase");
> 
> 
> Best,
> 
>   Alexander Hulpke
> 
> 
> 
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--
Dr. Alexander Konovalov, Lecturer
School of Computer Science, University of St Andrews
Software Sustainability Institute Fellow
https://alex-konovalov.github.io/
--
The University of St Andrews is a charity registered in Scotland:No.SC013532