On Tue, Jan 13, 2026 at 10:12 AM kcrisman <[email protected]> wrote: > > Just FYI this has been fixed upstream: > https://sourceforge.net/p/maxima/bugs/4634/ so hopefully in a future version > of Maxima soon. > > Question to Nils or others: In the past we used to also open a ticket for > Sage to make our own doctest - is that still the practice? I'm just making a > note at #40679 for now. > the practice is to open a PR with a fix. For a trivial PR, all is needed is a GitHub account and a browser, by the way. No need for a local Sage install, even.
> On Tuesday, November 18, 2025 at 12:55:27 PM UTC-5 [email protected] wrote: >> >> Thank you all for looking into this. I'm happy to hear that the bug has been >> fixed in Maxima. I'm sure the fix will work it's way into Sage soon enough. >> >> By the way, this sum did return "und" a few years ago, and later the answer >> changed to "ind" (before changing to -1/4). I agree that und is better than >> ind (as far as I understand the difference between these). >> >> Aaron >> >> On Tuesday, November 18, 2025 at 4:42:01 AM UTC-10 kcrisman wrote: >>> >>> Thanks for pointing that one out, that's great. >>> >>> (Though note that apparently the "correct" answer is "und" not "ind", >>> according to the latest comment on the Sourceforge ticket!) >>> >>> On Tuesday, November 18, 2025 at 8:14:01 AM UTC-5 Antonio Rojas wrote: >>>> >>>> This is fixed in maxima 5.48. The upgrade ticket is >>>> https://github.com/sagemath/sage/pull/40679 >>>> >>>> El martes, 18 de noviembre de 2025 a las 13:59:27 UTC+1, kcrisman escribió: >>>>> >>>>> I've opened https://sourceforge.net/p/maxima/bugs/4634/ for this, and >>>>> hopefully we'll hear back. Can someone open a corresponding Sage ticket >>>>> which will eventually get a doctest for the same? Thanks! >>>>> >>>>> On Monday, November 17, 2025 at 10:38:54 PM UTC-5 Nils Bruin wrote: >>>>>> >>>>>> I can confirm the behaviour you're observing ... It's really >>>>>> unfortunate!. This would be a result produced by maxima, so most likely >>>>>> it's a change due to a change in maxima version. I would call it a bug. >>>>>> One should probably try to reproduce it in maxima proper and then report >>>>>> it to maxima. Hopefully they can fix it. >>>>>> >>>>>> In maxima 5.47.0 I get: >>>>>> >>>>>> (%i1) load(simplify_sum)$ >>>>>> (%i2) simplify_sum( sum(n*(-1)^n,n,1,inf)); >>>>>> -1/4 >>>>>> >>>>>> This happens both on sage's ECL based one and on the system maxima >>>>>> (running on SBCL). So I think this behaviour tracks decisively to maxima. >>>>>> >>>>>> On Monday, 17 November 2025 at 19:23:53 UTC-8 [email protected] wrote: >>>>>>> >>>>>>> I have used SageMath within CoCalc for teaching Calculus 2 for several >>>>>>> years. >>>>>>> >>>>>>> In past semesters, the following code produced the output "ind": >>>>>>> >>>>>>> var('n') >>>>>>> sum(n*(-1)^n,n,1,oo) >>>>>>> >>>>>>> This is expected, since the series diverges. >>>>>>> >>>>>>> However, this semester I changed the kernel from SageMath 10.4 to the >>>>>>> current SageMath 10.7. Now this same code produces the output "-1/4" [I >>>>>>> believe 10.5 and 10.6 behave the same way as 10.7.] >>>>>>> >>>>>>> I have my students compute the value of several similar series >>>>>>> (replacing the -1 in the code above with -2, -1/2, 1/2, 1, and 2), and >>>>>>> all the others are behaving the same way they always have. It is only >>>>>>> this series which is giving me an unexpected output. >>>>>>> >>>>>>> Has anyone else encountered this issue? >>>>>>> >>>>>>> Thanks, >>>>>>> Aaron > > -- > You received this message because you are subscribed to the Google Groups > "sage-support" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/d/msgid/sage-support/0beb1c12-5d31-4dd4-a9ac-b92b56b09a65n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/sage-support/CAAWYfq1pdv62os5bfrfGxYaAxV53qV6FDk%3DZNvSjJikvZ_FJSQ%40mail.gmail.com.
