Reported in https://trac.sagemath.org/ticket/22566 and in https://trac.sagemath.org/ticket/22567
On Thursday, 2 March 2017 11:56:05 UTC+2, Ralf Stephan wrote: > > Opening a ticket for bugs is always a good idea. > > On Wednesday, March 1, 2017 at 11:11:41 AM UTC+1, Peleg Michaeli wrote: >> >> Hi, >> >> I have two questions, one might be thought of as a bug report / feature >> request, please tell me what you think. Trying >> integrate(x, x, 0, infinity) >> raises ValueError: Integral is divergent. >> >> My first question: why it does not simply return infinity? (it does, by >> the way, if one chooses algorithm='sympy') >> >> Now, trying >> integrate(ceil(x), x, 0, infinity) >> returns something weird: >> limit(1/2*(2*x + 1)*ceil(x) - 1/2*ceil(x)^2, x, +Infinity, minus) >> and trying to evaluate it with `.n()` raises TypeError. >> >> My second question: why it does not return infinity / raises ValueError: >> Integral is divergent..? >> >> And now, two more observations, which are certainly bugs: >> >> Bug 1: running >> integrate(ceil(x), x, 0, infinity, algorithm='sympy') >> raises AttributeError: 'module' object has no attribute 'ceiling'. I am >> not sure, but I think that the problem is that in sympy there's no `ceil` >> but rather `ceiling`. >> >> Bug 2: running >> integrate(floor(x), x, 0, infinity, algorithm='sympy') >> returns >> integrate(floor(x), x, 0, +Infinity) >> and trying to evaluate it with `.n()` returns (!!) >> -679.7441466712775 >> >> Should I open 2 tickets for these last two bugs? >> >> >> Thanks, >> Peleg. >> >> >> >> >> >> -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
