On Mon, Jul 11, 2011 at 10:30 AM, Pedro Cruz <[email protected]> wrote: > Good morning, > > the command > integrate( abs(x^2-1), x, -2,2) > does not do the job automatically. > > I have seen on this discussion group another, at least, similar > message. > > Is there an organized list of functions that are yet implemented for > integration?
Sage's symbolic integration is currently just calling out to Maxima, so you might ask about this on a Maxima list. Maxima's symbolic integration is some huge undocumented lisp program from ages gone by... The above doesn't return a closed result partly because Maxima doesn't: wstein@sage:~$ sage -maxima Maxima 5.23.2 http://maxima.sourceforge.net (%i1) integrate(abs(x^2-1),x,-2,2) ; 2 / [ ! 2 ! (%o1) I !x - 1! dx ] / - 2 You might find this useful though: sage: numerical_integral(abs(x^2-1),-2,2) (3.9999999999999996, 4.4408920985006262e-14) or sage: N(integral(abs(x^2-1),(x,-2,2))) 3.9999999999999996 > How can one cooperate without being a sage programmer? > > Thank you. > > Pedro > > -- > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/sage-support > URL: http://www.sagemath.org > -- William Stein Professor of Mathematics University of Washington http://wstein.org -- To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
