Hi James-
I disagree that Maxima is trustworthy. There are little bugs here
and there. More than I have time to report or annotate.
I gave up on using it for graphics altogether.
I hope for better days.
Let me give you another bug, involving differentiation:
(C1) f1(x):= (cos^3*(sin*(2*x)));
(C2) diff(f1(x),x);
This evaluates to the bizarre answer:
2 x cos^3 DEL(sin) + 6 x cos^2 sin DEL(COS) + 2 cos^3 sin DEL(x)
The correct answer, by hand and confirme with Maple, is:
6 cos^2(sin(2x))*sin(sin(2x))*cos(2x);
Regs,
Henry
synthespian@uol.com.br
James Amundson writes:
> Great. Not too long ago, I wrote that none of the bugs found recently in
> Maxima resulted in mathematically incorrect answers. Now you have to go
> an ruin the streak.
>
> This bug deserves *careful* consideration.
>
> Thanks for the report.
>
> --Jim
>
>
> On Fri, 2002-04-05 at 14:36, C Y wrote:
> > I've run into a problem with the Maxima integration ability. I tried
> > to integrate 3^log(x), and according to both hand and mathematica
> > calculations the answer should be (x*3^log(x))/(1+log(3)). Maxima,
> > however, gives 3^(2*log(x))/(2*log(3)). Here is a simple test to show
> > the problem:
> >
> > (C1) c:3^log(x);
> >
> > LOG(x)
> > (D1) 3
> > (C2) diff(integrate(c,x),x);
> >
> > 2 LOG(x)
> > 3
> > (D2) ---------
> > x
> >
> >
> > CY
> >
> >
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