<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>I push releases of HtDP/2e at the same time as new versions of the software are released: every odd month of the year. </div><div><br></div><div>The announcements are available on  <<a href="mailto:users@lists.racket-lang.org">users@lists.racket-lang.org</a>> but also on low-frequency announcement lists: </div><div><br></div><div> <a href="http://racket-lang.org/community.html">http://racket-lang.org/community.html</a></div><div><br></div><div><br></div><div><br></div><div><div>On Jul 20, 2010, at 6:43 PM, Richard Mittel wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">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<br><br><div class="gmail_quote">On Tue, Jul 20, 2010 at 5:33 PM, Matthias Felleisen <span dir="ltr"><<a href="mailto:matthias@ccs.neu.edu">matthias@ccs.neu.edu</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><br> Here is the full explanation:<br> <br> There are two distinct teachpacks for images:<br>  2htdp/image (the new one; experimental; only available with require)<br>  htdp/image (the old one; available both ways)<br> <br> We are right now transitioning from the old one to the new one.<br> Many programs work in both, but not all. I started rewriting<br> the HtDP/2e examples with the new teachpack, but in a way that<br> I thought was compatible.<br> <br> The problem is that we wish to keep evolving the new teachpack<br> and make it only available widely when things are close to<br> finished. BUT, so many people have discovered it and so many<br> people already know that it is better than the old one that<br> we have had lots of request for the new one.<br> <br> I guess I will need to rewrite the HtDP/2e version so that<br> it is all about the new version.<br> <br> Does this help?<br><font color="#888888"> <br> -- Matthias</font><div><div></div><div class="h5"><br> <br> <br> <br> <br> <br> <br> <br> On Jul 20, 2010, at 5:31 PM, Richard Mittel wrote:<br> <br> <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> Hi,<br> <br> 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.<br> <br> Thanks again for your time,<br> RM<br> <br> On Tue, Jul 20, 2010 at 2:16 PM, Matthias Felleisen <<a href="mailto:matthias@ccs.neu.edu" target="_blank">matthias@ccs.neu.edu</a>> wrote:<br> <br> Hi --<br> <br> Thanks for asking. I am not sure I understand the question properly.<br> When you write<br> <br>  (require 2htdp/image)<br>  (above (circle 30 "solid" "red") (rectangle 50 10 "solid" "blue"))<br> <br> and click on Run you get the expected red circle over a blue rectangle.<br> Correct?<br> <br> And now you wish to use the Teachpack menu instead of the require line?<br> Or are you saying that your implementation of the teachpack doesn't have above?<br> <br> Thanks -- Matthias<br> <br> <br> <br> <br> <br> <br> On Jul 20, 2010, at 2:41 PM, Richard Mittel wrote:<br> <br> Dear Professor Felleisen,<br> <br> DrRacket's "image" teachpack does not seem to define the "above" function, as HtDP (second edition, stable version) says it should.  The context is<br> <br> (define BDY<br>   (above<br>     (rectangle (...<br> <br> in <a href="http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp.html" target="_blank">http://www.ccs.neu.edu/home/matthias/HtDP2e/htdp.html</a>, 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.<br> <br> Thank you,<br> RM<br> <br> <br> </blockquote> <br> </div></div></blockquote></div><br> </blockquote></div><br></body></html>