On 2014-06-23, Karl Schultheisz <art.live...@gmail.com> wrote: > I'm using Sage 6.2 on Arch Linux. I have posted before about sums being > wrong ><https://groups.google.com/d/msg/sage-support/IgC78rcdO7c/qTWzpA9f-P8J>, > and I am happy to see that the community took action. Thanks! I have been > seeing other errors that may or may not be related to those addressed in > the link above. > > I open a new Sage session (command line). The following code ought to > return (e^x - 1)/x. > > sage: k = var('k') > sage: sum(x^k/factorial(k+1),k,0,oo) > 1/4*sqrt(pi)*sqrt(x)*e^(1/2*x) > > This looks similar to the sort of nonsense it was spitting out when > misinterpreting > Bessel functions from Maxima <http://trac.sagemath.org/ticket/16224>. In > the same session, if I run the summation command again, the result is
did you try applying the patch from #16224 ? > different. > > sage: sum(x^k/factorial(k+1),k,0,oo) > sum(x^k/factorial(k + 1), k, 0, +Infinity) > > And after this it will not simplify any sums, even ones it would have done > correctly on the first try: > > sage: sum(x^k/factorial(k),k,0,oo) > sum(x^k/factorial(k), k, 0, +Infinity) > > Even a reset doesn't help. (As a side-note, the exit command doesn't > survive reset.) > > sage: reset() > sage: k = var('k') > sage: sum(x^k/factorial(k),k,0,oo) > sum(x^k/factorial(k), k, 0, +Infinity) > sage: exit > > --------------------------------------------------------------------------- > NameError Traceback (most recent call > last) > /opt/sage/local/lib/python2.7/site-packages/sage/all_cmdline.py in ><module>() > ----> 1 exit > > NameError: name 'exit' is not defined > > Finite sums seem to be ok. > > sage: sum(x^k,k,0,3) > x^3 + x^2 + x + 1 > sage: m = var('m') > sage: sum(x^k,k,0,m) > (x^(m + 1) - 1)/(x - 1) > > Any help is greatly appreciated. > -- 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 sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.