On Thursday, August 18, 2016 at 12:59:39 PM UTC+1, Simon King wrote:
>
> Hi Dima,
>
> On 2016-08-18, Dima Pasechnik <dim...@gmail.com <javascript:>> wrote:
> >> Does a concept of "GAP packages" and "Singular packages" exist? If so,
> >> you should follow recommendations for those kinds of packages to
> install
> >> your GAP/Singular code.
> >
> > With GAP it is problematic, as updating GAP wipes out installed GAP
> > packages.
> > Also there is a lot of boilerplate to produce for a GAP package, and I
> > would not really recommend this, unless
> > it's a separate piece useful with GAP alone.
>
> It isn't useful with GAP alone, and also I wouldn't like to learn yet
> another package ecosystem. The change from old- to new-style Sage
> packages was painful enough for me.
>
> > An alternative is to use libGAP factory function facility.
> > This allows you to embed GAP code into py(x) files.
> > E.g.
> >
> > sage: t=libgap.function_factory("""function(m)
> > ....: local a,b;
> > ....: a:=m^2;
> > ....: return a-1;
> > ....: end""")
> > sage: t(5)
> > 24
>
> That can also be done in GAP instead of libGAP. But isn't it more
> elegant to advise (lib)GAP to read functions from a file, rather than
> to send the function definitions through (lib)GAP's interface?
>
I did use libgap.function_factory in few places.
One advantage is that you can doctest a bit easier than with GAP code.
Anyway, I guess it depends upon how much GAP code you have. If its hundreds
of lines it's probably nicer to put them into a file.
Not sure what's faster. Probably function_factory is faster than file I/O
(i.e. GAP's Read()).
> > With Singular, you might look at Normaliz package, that installs a
> Singular
> > "library", and do what they do.
>
> Singular library functions are located in
> SAGE_ROOT/local/share/singular/, and that's where both an old style and
> a new style spkg are supposed to put stuff into --- unless one decides
> to put the files under SageMath's version control.
>
> Best regards,
> Simon
>
>
>
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