On Sat, Feb 20, 2021 at 11:10 AM Emmanuel Charpentier
<
emanuel.c...@gmail.com> wrote:
>
> In 9.2.beta7, (our port of) Maxima seems to have an nice bug : inability to evaluate (some) symbolic sums. Minimal illustration :
>
> ```
> ;;; Loading #P"/usr/local/sage-9/local/lib/ecl/sb-bsd-sockets.fas"
> ;;; Loading #P"/usr/local/sage-9/local/lib/ecl/sockets.fas"
> Maxima 5.44.0
http://maxima.sourceforge.net
> using Lisp ECL 20.4.24
> Distributed under the GNU Public License. See the file COPYING.
> Dedicated to the memory of William Schelter.
> The function bug_report() provides bug reporting information.
> (%i1) display2d:false;
>
> (%o1) false
> (%i2) sum(i, i, 1, 7);
>
> (%o2) 28
>
> /* As expected */
>
> (%i3) sum(i, i, 1, p);
>
> (%o3) 'sum(i,i,1,p)
>
> /*Huh ? */
sum() is lazy by default, you need
(%i5) sum(i,i,1,p), simpsum;
(%o5) (p^2+p)/2
HTH
Dima
>
> (%i4) sum(i, i, 1, p), nouns;
>
> (%o4) 'sum(i,i,1,p)
>
> /* !!!! */
> ```
>
> Curiously, `sage` seems perfectly able to use Maxima's `sum` for its own purposes :
>
> ```
> sage: sum(i, i, 1, n)
> 1/2*n^2 + 1/2*n
> ```
>
> Could you check this ?
>
> - On a standalone installation of Maxima
>
> - On previous versions of Sage ?
>
>
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