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. > > > > > >
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