John Cremona on Sun, 10 Dec 2023 16:58:48 +0100


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Re: The GP command “?”

I do use ? as I still don't know the section numbers.  I wouldn't mind having something like ?sections, but surely*noone* uses ?? to display users.dvi !? So we could make ?? do what ? does now (or at least the top part).

John

On Sun, 10 Dec 2023, 11:12 Bill Allombert, <Bill.Allombert@math.u-bordeaux.fr> wrote:
On Sat, Dec 09, 2023 at 07:49:50PM -0800, Ilya Zakharevich wrote:
> Are people ACTUALLY using “the sections” in the results of the GP command
>      ?
> ?  Myself, I use only “the tail” of its output.  I do not ever recall
> finding what ?1 outputs useful in the slightest…

The start of the list is more for beginner, the end more for advanced users.

> (However, the output of ?19, ?20, ?21 is quite useful (although       these is
> NOT LISTED in the output of
>       ?

?19, ?20, ?21 list functions that are private to the GP interpreter and cannot
be called normally.

For example,

? _factor_Aurifeuille(5,5)
  ***   syntax error, unexpected invalid token, expecting end of file: _factor_Aurifeuille(5,5)
? _*_(5,5)
  ***   syntax error, unexpected invalid token, expecting end of file: _*_(5,5)

Though it is possible to call them using alias:
? alias("mul","_*_")
? mul(5,5)
%4 = 25
? fold(mul,[1..100])==100!
%5 = 1

Cheers,
Bill.