I push releases of HtDP/2e at the same time as new versions of the software are released: every odd month of the year.
The announcements are available on <us...@lists.racket-lang.org> but also on low-frequency announcement lists: http://racket-lang.org/community.html On Jul 20, 2010, at 6:43 PM, Richard Mittel wrote: > Thanks, it does help to know this. Is there some easy way (like a mailing > list) for me to be notified when the HtDP/2e rewrites are done? -RM > > On Tue, Jul 20, 2010 at 5:33 PM, Matthias Felleisen <matth...@ccs.neu.edu> > wrote: > > Here is the full explanation: > > There are two distinct teachpacks for images: > 2htdp/image (the new one; experimental; only available with require) > htdp/image (the old one; available both ways) > > We are right now transitioning from the old one to the new one. > Many programs work in both, but not all. I started rewriting > the HtDP/2e examples with the new teachpack, but in a way that > I thought was compatible. > > The problem is that we wish to keep evolving the new teachpack > and make it only available widely when things are close to > finished. BUT, so many people have discovered it and so many > people already know that it is better than the old one that > we have had lots of request for the new one. > > I guess I will need to rewrite the HtDP/2e version so that > it is all about the new version. > > Does this help? > > -- Matthias > > > > > > > > > On Jul 20, 2010, at 5:31 PM, Richard Mittel wrote: > > Hi, > > Thanks for the speedy response. Yes, I do get the expected red circle over > the blue rectangle. But I believe HtDP(2) says it should work without the > explicit (require 2htdp/image), as long as one first adds the "image" > teachpack through the "Add Teachpack" option of the Language menu. And yet > when I do this, it doesn't work, from which I infer (maybe wrongly?) that > "above" is missing from the teachpack implementation. > > Thanks again for your time, > RM > > On Tue, Jul 20, 2010 at 2:16 PM, Matthias Felleisen <matth...@ccs.neu.edu> > wrote: > > Hi -- > > Thanks for asking. I am not sure I understand the question properly. > When you write > > (require 2htdp/image) > (above (circle 30 "solid" "red") (rectangle 50 10 "solid" "blue")) > > and click on Run you get the expected red circle over a blue rectangle. > Correct? > > And now you wish to use the Teachpack menu instead of the require line? > Or are you saying that your implementation of the teachpack doesn't have > above? > > Thanks -- Matthias > > > > > > > On Jul 20, 2010, at 2:41 PM, Richard Mittel wrote: > > Dear Professor Felleisen, > > DrRacket's "image" teachpack does not seem to define the "above" function, as > HtDP (second edition, stable version) says it should. The context is > > (define BDY > (above > (rectangle (... > > in http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp.html, and I have also > added the "universe" teachpack. I can get "above" by doing (require > 2htdp/image), but I really need the teachpack approach to work. Please help. > If the problem is somehow due to my own error, please accept my apologies in > advance. > > Thank you, > RM > > > >
_________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
