On Friday, December 30, 2016 at 3:54:08 PM UTC-8, Emmanuel Charpentier
wrote:
>
> This is what one expects from sage...
>
> sage: maxima("sum(j,j,1,p)").sage()
> sum(j, j, 1, p)
>
> This is what is expected from Maxima, as long as simpsum is not true
> (default)
>
> sage: maxima.sum(j,j,1,p).sage
Nils,
Something *is* fishy here. Annotated but unedited transcript :
charpent@asus16-ec:~$ sage
┌┐
│ SageMath version 7.5.rc1, Release Date: 2016-12-28 │
│ Type "notebook()" for the browser-based notebook interfac
On Friday, December 30, 2016 at 10:05:19 AM UTC-8, Nils Bruin wrote:
>
>
> It looks like sum and product simplify before they evaluate their
> variables. This is a bug in maxima, not in the sage interface, I would say.
>
> Perhaps it's not a bug. It certainly is documented (and indeed, if in
sum(
On Friday, December 30, 2016 at 3:43:34 AM UTC-8, Emmanuel Charpentier
wrote:
>
> I also note that our use of Maxima's product() is wrong, wrong, wrong :
>
> sage: maxima.product(X(j),j,1,p).sage()
> X(j)^p
>
>
maxima.sum is equally wrong:
sage: maxima_calculus.sum(j,j,1,p)
_SAGE_VAR_j*_SAGE_VAR
Robert Dodier suggests :
(%i12) sumcontract (intosum (sum(X(i),i,1,n+1)-sum(X(i),i,1,n)));
(%o12) X(n + 1)
Indeed :
sage:
maxima.sumcontract(maxima.intosum(sum(X(j),j,1,p+1)-sum(X(j),j,1,p))).sage
: ()
X(p + 1)
But :
sage:
(sum(X(j),j,1,p+1)-sum(X(j),j,1,p)).
Dear Nils, dear list,
Le mercredi 28 décembre 2016 20:59:50 UTC+1, Nils Bruin a écrit :
>
> On Wednesday, December 28, 2016 at 6:18:28 AM UTC-8, Emmanuel Charpentier
> wrote:
>>
>> I d not understand what is possible and not possible about sums with Sage
>> (and its minions).
>>
>> I am interest
On Wednesday, December 28, 2016 at 6:18:28 AM UTC-8, Emmanuel Charpentier
wrote:
>
> I d not understand what is possible and not possible about sums with Sage
> (and its minions).
>
> I am interested in the symbolic manipulation of a sum of (unspecified)
> data series X. Since Sage does nott (ye
