Dear Vladimir and Jens, @Jens: Yes, I saw it as well. In fact, I already sent correctly packaged solutions. I also noticed that I completely overlooked the convex-hull problem. It does not seem to be so difficult to write a function for that, so if I feel like it I may do that. On Wed, 12 Jul 2006, Vladimir V Kisil wrote:

Daniel Seidel is now working on adding drawing facilities to GiNaC (through the Asymptote package) as a part of his summer project. There is a hope that the working code will be obtained by the end summer. In this case both the parabola and the saddke may be easily drawing.

That sounds like a very good idea. I'm afraid though that they will want to produce their DVD a bit earlier. Well, when these plotting routines are ready, I suppose I can always ask whether it can still be included.

Meanwhile my GiNaC library "cycle" which was announced here about seven months ago can draw circles, parabolas and hyperbolas.

I just had a look at it. I suppose I could draw a polynomial from an object of type cycle with k=1, l=(0,1/2) and a metric of diag(1,0). Is that right? It strikes me as not really what I would like to show someone as a way of drawing a function.

PS Are we allowed to add (or at least suggest) few examples of things where GiNaC is good (and other CAS are not), otherwise it looks like a misrepresentation.

Not sure. Didn't ask. I agree that the problem set looks a bit random and really not very interesting. Best wishes, Chris