Re: [racket] Implementation of Simpson's Rule (SICP Exercise 1.29)

2013-11-06 Thread Ben Duan
Thank you, Jens. I didn't know that the inexactness of floating point numbers could make such a big difference. On Tue, Nov 5, 2013 at 10:01 PM, Jens Axel Søgaard wrote: > I think I got it now. > > In your solution the x-values are computed as follows: > h = (b-a)/n > x1 = a+1 > x3 = x1 +

Re: [racket] Resources for understanding Racket’s language model?

2013-11-06 Thread Ben Duan
Thank you for your replies. I’m not currently implementing a language. But I’m very interested in how Racket works and why it is designed like this. So I want to read more about it. Ben On Tue, Nov 5, 2013 at 10:41 PM, Matthias Felleisen wrote: > > Ben, on the first site you can find my pap

Re: [racket] Boston Area Meet Up

2013-11-06 Thread Greg Hendershott
+1 I've attended a few things in Boston via Meetup.com, lately.[1] I've thought, dang, I wish there were one for Racket. Question for NEU folks, or others with local space: If someone like Daniel did the organizing, could you provide some space? Otherwise, places like Workbar or tech incubators

Re: [racket] Boston Area Meet Up

2013-11-06 Thread Neil Van Dyke
Such Racket meetups could be posted to the "boston-lisp-announce" email list. This list previously helped Fare' bootstrap the Boston Lisp Meetings. "boston-lisp-announce" is announcements-only, very-low-traffic, and has around 150 subscribers. http://www.neilvandyke.org/boston-lisp-announce/

Re: [racket] Boston Area Meet Up

2013-11-06 Thread David Van Horn
On 11/6/13, 7:41 AM, Greg Hendershott wrote: Question for NEU folks, or others with local space: If someone like Daniel did the organizing, could you provide some space? I'm sure either NEU or Harvard could provide the space. David Racket Users list: http://lists.racke

Re: [racket] Implementation of Simpson's Rule (SICP Exercise 1.29)

2013-11-06 Thread Matthias Felleisen
On Nov 6, 2013, at 7:13 AM, Ben Duan wrote: > Thank you, Jens. I didn't know that the inexactness of floating point numbers > could make such a big difference. >From HtDP/1e: (define JANUS (list #i31 #i2e+34 #i-1.2345678901235e+80 #i2749 #i-2939234

Re: [racket] Implementation of Simpson's Rule (SICP Exercise 1.29)

2013-11-06 Thread Neil Toronto
On 11/06/2013 09:24 AM, Matthias Felleisen wrote: On Nov 6, 2013, at 7:13 AM, Ben Duan wrote: Thank you, Jens. I didn't know that the inexactness of floating point numbers could make such a big difference. From HtDP/1e: (define JANUS (list #i31 #i2e+34 #i-1.23456789

[racket] fun porting scsh to Racket

2013-11-06 Thread Vlad Kozin
just putting this in writing helped a lot: I'll give solution 3 a try (see below). I'd still love to pair with Racketeers, so let me know if u're interested. Unfortunately, noone here at Hacker School wants to do any Racket, everyone's hyped by Clojure, JavaScript and Python. Feeling so lonely :

[racket] opengl multisampling troubles

2013-11-06 Thread Yuri Garmay
Hi all! I have opengl multi-sampling not working under linux-64. I have tried set up msaa using gl-config and gl-enable as it desribed in manual, but that failed. After that I checked msaa in c+glut and found it works, then I installed racket win32 under wine and found it works too. So may it be

[racket] possible bug in scribble-pkgs / scribble-lib / scribble / html-render.rkt

2013-11-06 Thread Matthew Butterick
Round about line 1494 is the following: '(span ([class "mywbr"]) " " nbsp)) I believe this line is causing the (I assume unintended) side effect of adding a spurious space after slashes within Racket commands in the left-hand navigation in the documentation, for instance here: http://docs.racket