Hi, On Tue, Aug 18, 2009 at 8:42 PM, rjf<fate...@gmail.com> wrote: > > did you mean to integrate with respect to "x^2" ?
Yes. > Well, x^2 doesn't occur in f(x). So let's rename x^2 as y. > What is the integral of f(x) with respect to y? > > It is y*f(x). > > substituting back x^2 for y, you get x^2*f(x). Are you saying during integration maxima is not aware that "x^2" is the square of "x"? Take following examples: ---------- (%i4) integrate(log(x), x); (%o4) x log(x) - x (%i5) integrate(log(x^2), x^2); 2 (%o5) 2 x log(x) ---------- "log" is certainly aware of it. > Certainly Maxima expects "the variable of integration" as > the second argument. Anything else is asking for trouble. Then maxima should throw error instead of giving a wrong answer silently. This is rather bizarre given maxima is known to be over-cautious during integration and sometime it asks too many questions, even something like -------- (%i6) integrate(1/x, x, 0, 1); Is x + 1 positive, negative, or zero? -------- Cheers, Golam --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---