Actually, the bar for Academic and technical books seems to be covered if
it's used as a textbook by several reputable institutions.
On Mon, Nov 24, 2014 at 9:59 AM, Robby Findler ro...@eecs.northwestern.edu
wrote:
Bullet 4 seems achievable:
On Wed, Jul 2, 2014 at 3:05 PM, Matthias Felleisen matth...@ccs.neu.edu
wrote:
While I make provocative statements to launch discussions of what many
people accept as 'givens', my actual stances are nuanced.
You can't do this. If we cannot rely on your statements as gospel truth, we
have to
I used Scala for our intro course last year, mostly because I wanted types.
I know Matthias thinks types are a horrible thing to make students deal
with first semester, but I found that students made different kinds of
mistakes than they did in Racket. When you're writing containsDoll and the
On Sun, Apr 20, 2014 at 9:06 PM, Matthias Felleisen matth...@ccs.neu.eduwrote:
... I will create a slimed down version of big-bang, little-poof?
I couldn't let this go by. It's probably because I'm brain-dead, but first
I wondered why Matthias was going to create a version of big-bang
I use the Racket ppa. Hopefully, the new version will appear there
shortly. To use:
$ sudo add-apt-repository ppa:plt/racket
$ sudo apt-get update
$ sudo apt-get install racket
You have to wait a bit for the maintainer to put together the .deb
file, but I think it's worth it.
Todd
On Tue, Jan
Use the PPA. It makes everything happy:
$ sudo add-apt-repository ppa:plt/racket
$ sudo apt-get update
$ sudo apt-get install racket
If that doesn't work for you, let me know and I'll try reinstalling to
see if I do anything special that I don't recall at the moment.
Todd
On Thu, Jan 2, 2014
I just found a lovely Java expression to emphasize the inexactness of
doubles to my AP students. The problem--which I think is from
HtDP/1e--is to find the value of a bag of coins given the number of
pennies, nickels, dimes, and quarters. In BlueJ's code pad (or similar
in DrJava, jGrasp, etc.)
One thing that I think math education does horribly at is having
students work from the specific to the general. When we teach
functions, we say f(x) = x^2, now tell me what f(1), f(3), f(7) are.
What we don't do nearly often enough is work in the other direction.
I think a great activity with
I've taught programming using Racket for several years as the Intro
course in a public high school. In most states, the powers-that-be
have so little awareness of, or concern about, high school computer
science that as long as you cover the general topics listed in the
course descriptions, you're
I have to put in a plug for Learn You a Haskell for Great Good. It's
quite entertaining and several of my high school students have managed
to work their way through most of it.
http://www.learnyouahaskell.com
Todd
On Thu, Jul 4, 2013 at 11:44 AM, Sean Kanaley skana...@gmail.com wrote:
I can't
In my opinion, there are two kinds of DSLs: good ones and bad ones.
Good ones feel like you're using the programming language, but it has
been tailored to the problem domain. Your intuitions about using the
language still work in the DSL, and the DSL manages to fill in the
boilerplate that would
Whoa! I had no idea that Shriram and the rest of the Rice group were
the impetus for the distillation/clarification and naming of The
Expression Problem. I'm continually amazed that I've had a chance to
interact with people who've had such a fundamental impact on the
field. And because I came to
You can also use the PPA. It builds the 32-bit and 64-bit packages.
$ sudo add-apt-repository ppa:plt/racket
$ sudo apt-get update
$ sudo apt-get install racket
and you get notified of updates automagically!
On Wed, Jun 19, 2013 at 10:30 PM, Eli Barzilay e...@barzilay.org wrote:
50 minutes
Make sure you're using
#lang racket
declared at the top of your source code and have chosen the appropriate
radio button from the Choose Language... menu. It sounds like you're stuck
in one of the teaching languages.
On Sun, Dec 9, 2012 at 4:40 PM, Geoffrey Boom geoff.the.b...@gmail.comwrote:
of world events and
replaying for the creation of an animated gif is one of the standard tests
I run. It passed on my machine a couple of weeks ago -- Matthias
On Nov 8, 2012, at 9:47 AM, Todd O'Bryan wrote:
In the universe, if I use the record? option for big-bang, I get a bunch
of png
Maybe signatures for the teaching languages? Maybe?
On Wed, Oct 3, 2012 at 9:37 PM, Asumu Takikawa as...@ccs.neu.edu wrote:
On 2012-10-03 16:21:10 -0600, Danny Yoo wrote:
Any details on what we'll be hacking on after Racketcon?
The plan is to hack on small, self-contained improvements such as
Well, I know how I'd do it, but I don't think your professor is
teaching you the design recipe or templates, so I'm not sure how to
help you without giving away the answer.
Here's a hint. Most numbers involving natural numbers (0, 1, 2, 3,
...) have the following form:
(define f
(lambda (n)
Wolfram Alpha parses 1/2+2/3i as 1/2 + 2/(3i) and 1/2+(2/3)i as the
complex number with real part 1/2 and imaginary part 2/3.
On Wed, Aug 8, 2012 at 3:47 AM, Jens Axel Søgaard jensa...@soegaard.net wrote:
2012/8/8 Matthias Felleisen matth...@ccs.neu.edu:
If it weren't against math conventions,
I just discovered that the way you enter (and display) a number like
1/2 + (2/3)i
in Racket (and Scheme, presumably) is 1/2+2/3i.
I understand why that is, and can't think of what else to do, but has
anyone had students get confused because the form looks like the i is
in the denominator of the
-
From: Todd O'Bryan toddobr...@gmail.com
To: PLT-Scheme Mailing List us...@lists.racket-lang.org
Sent: Monday, August 6, 2012 6:05:31 PM GMT -05:00 US/Canada Eastern
Subject: [racket] weirdness with complex numbers
I just discovered that the way you enter (and display) a number like
1/2
Hey, now. Some of us haven't had that extra second, yet. Don't ruin it
for us. :-)
On Sat, Jun 30, 2012 at 8:44 PM, Pierpaolo Bernardi olopie...@gmail.com wrote:
I want in racket all that my hp50g can do.
And since you are at it, you could also port the combinatorica library
to racket.
I
This is clearly a problem with you academic types not knowing how
things work in the real world. San Francisco is *full* of people who,
for the right price, will be happy to rifle through Mr. Dlouhy's
things until they find the videos or determine that he doesn't have
them. They might even throw
Alternatively, draw up a contract with the authors of the parts of
Racket that you really want, which guarantees a level of service you'd
be comfortable with. You could probably get by with Eli, Matthew, and
Robby, and they could probably guarantee quick service for sufficient
amounts of money.
One of my favorites is the Halloween logo you get on October 31.
On Tue, Feb 14, 2012 at 2:10 AM, Ashok Baktha lifebala...@gmail.com wrote:
No you are not hallucinating. I got the same heart based logo when using Dr
Racket.
That is pretty cool! Thanks!
On 14-Feb-2012, at 12:33, Rüdiger
be an issue.
On Thu, Jan 26, 2012 at 6:29 PM, Paul Leger ple...@gmail.com wrote:
On 01/26/2012 08:05 PM, Todd O'Bryan wrote:
I installed Racket from Jon Rafkind's Ubuntu PPA and the only font I
have listed in the Preferences is Monospace.
I suspect there's probably a missing library or something
, 2012 at 21:41, Todd O'Bryan toddobr...@gmail.com wrote:
Yeah, I'm using the same one. I know it's worked before, so I suspect
I'm missing a necessary library or some other widget that lets
DrRacket know where to look for the fonts. The one difference is that
I've started using Kubuntu
I think Racket Noob is actually somebody from another language just
messing with people. The hotmail address, the erudite vocabulary
couched in slightly broken English, the clearly antagonistic tone...it
all adds up to a plant.
The question is who? Is it Guido? Matz? Martin Odersky? I somehow
This is just a guess, but perhaps Windows has helpfully added a .txt
extension (or some other nonsense) to the end of your filename? You
might try looking at the file's properties, just to make sure
something weird isn't going on.
On another note, as long as your Fahrenheit-Celsius function
One thing that annoys me about DrRacket is that, if you have an error
in the Definitions pane, none of your required modules are loaded, so
if you try to fiddle in the Interactions window, you get undefined
errors. It may be that (require ...) can appear pretty much anywhere,
so I don't know if
the require in the REPL directly?
(The error could be in a require line, so there is no way
of saying 'load this even if hell breaks loose').
On Nov 14, 2011, at 3:12 PM, Todd O'Bryan wrote:
One thing that annoys me about DrRacket is that, if you have an error
in the Definitions pane, none
I should have been clearer. It is compile-time errors. Runtime work fine.
On Mon, Nov 14, 2011 at 3:34 PM, Danny Yoo d...@cs.wpi.edu wrote:
On Mon, Nov 14, 2011 at 3:12 PM, Todd O'Bryan toddobr...@gmail.com wrote:
One thing that annoys me about DrRacket is that, if you have an error
http://news.cnet.com/8301-1001_3-20125026-92/john-mccarthy-creator-of-lisp-programming-language-dies/
Just found this out on someone's Facebook status, of all places.
_
For list-related administrative tasks:
On Ubuntu 11.04, you need to install libgtkglext1, which I just got
around to doing.
Todd
On Fri, Sep 30, 2011 at 11:02 AM, Matthew Flatt mfl...@cs.utah.edu wrote:
At Thu, 29 Sep 2011 17:40:29 -0700 (PDT), Richard Ervin wrote:
I have a question. Whenever I try to use certain games in the PLT
Jon Rafkind,
Any chance that you might put a version with Matthew's fix on the PPA
site? Also, could you make libgtkglext1 a dependency of the install so
that the OpenGL-dependent games in plt-games work?
(I wish I knew how .debs work so I could help with this instead of
just asking for stuff.
On Mon, Oct 17, 2011 at 9:46 PM, Eli Barzilay e...@barzilay.org wrote:
30 minutes ago, Todd O'Bryan wrote:
The PPA makes things much nicer. I always have to install on:
- my desktop
- my laptop
- my teacher machine
- both servers at school, and
- in the client image for the lab
On Mon, Oct 17, 2011 at 10:14 PM, Eli Barzilay e...@barzilay.org wrote:
A few minutes ago, Todd O'Bryan wrote:
On Mon, Oct 17, 2011 at 9:46 PM, Eli Barzilay e...@barzilay.org wrote:
There's also our own installers, which are very easy to set
up. It's true that it won't get added as a known
I actually wish it weren't in there. One student discovers it, and
lots of students start using list instead of cons ... empty. That
wouldn't be a problem except that most of them don't have the
conceptual chops yet and I have to fix their confusion.
Todd
On Fri, Sep 30, 2011 at 6:05 PM, Stephen
I think he's saying you could change that to
(require plot/compat)
and it would still work.
On Fri, Sep 30, 2011 at 12:06 PM, Robby Findler
ro...@eecs.northwestern.edu wrote:
I have some old scripts that I used to build a paper (or maybe just
play with some data related to the paper I'm not
I think that is, strangely enough, possible.
Look under the Help Desk and choose Interact with DrRacket in
English. I can set DrRacket to Spanish even though my system is in
English. You have to restart DrRacket, but hopefully it works the same
in Mac OS.
Todd
On Wed, Sep 28, 2011 at 5:19 PM,
Kudos on managing this. It makes printing so much easier in my lab,
and I hadn't realized it had happened until I was going to show my
students the convoluted way we used to get 2-up printing.
Thanks!!!
Todd
_
For list-related administrative
Given how much of the Racket community--Adelphi, Brown, and
Northeastern all come to mind--has or is going to feel the effects of
Hurricane Irene, I just wanted to send best wishes and let people know
that we're thinking of you!
Todd
_
For
I realize there's huge reluctance to muck with a release before having
time to check everything, but if it's possible to fix this with a
single small change that everyone agrees is unlikely to break anything
else, might you consider releasing a 5.1.3 or 5.1.2b or 5.1.2+ or some
new version number?
Yeah. Could we just have the Language menu and Teachpacks fade away?
I've been bitten so many times by the hidden stuff that I think it's
easier to have students explicitly write
#lang htdp/bsl
(require 2htdp/image)
at the top of files. I'd prefer something like #lang beginner, but I
don't
I'm sure people have seen this before, but...
http://blog.whatitslikeontheinside.com/2007/11/send-in-clones.html
Who's your Mordac?
Todd
On Fri, Jul 8, 2011 at 7:07 AM, Sam Tobin-Hochstadt sa...@ccs.neu.edu wrote:
On Jul 8, 2011 6:13 AM, Stephen De Gabrielle stephen.degabrie...@acm.org
Hey all,
I'm trying to use Scribble to create multiple forms of the same
document--for example, teacher and student editions of the same text.
Both documents share a lot of content, but also have differences.
I created a parameter and function:
(define edition (make-parameter default))
(define
:27:52 -0400, Todd O'Bryan wrote:
Hey all,
I'm trying to use Scribble to create multiple forms of the same
document--for example, teacher and student editions of the same text.
Both documents share a lot of content, but also have differences.
I created a parameter and function:
(define
:
At Wed, 29 Jun 2011 09:47:16 -0400, Todd O'Bryan wrote:
Any thoughts on the second problem--how to unwrap a (list el1 el2 el3
...) so that Scribble interprets it as el1 el2 el3 ... ?
I'm not sure I understand. Can you give me an example of the problem
? (edition) v)
text
'(
At Wed, 29 Jun 2011 10:54:50 -0400, Todd O'Bryan wrote:
Here's a non-working example:
-
#lang scribble/base
@(define edition (make-parameter default))
@(edition teacher)
@(define (itemlist* . args)
(apply itemlist (filter item? args
And in contrast to clay tablets and, oh laptops, you can read things
written on paper at the beach without worrying about getting sand in
them. And sitting at the barber shop without worrying that you'll run
out of power. And in the tub without worrying that they'll get the
water muddy. Or
When my students print files on a black and white printer without
turning off syntax coloring, the comments are really hard to read.
Maybe a slate gray or something? You want comments to be easily
readable and easily ignorable--that's a hard sweet spot to hit.
Todd
On Mon, Jun 20, 2011 at 11:20
I have a structure with a guard function. It works well.
However, I want to use it in a (shared ...) construct, and when the
guard runs, a value is #undefined. I'm fine with letting the guard
accept #undefined as a legal value, but I can't figure out any way
to test for it.
Is there such a
This looks shockingly like a homework problem that a teacher might
have assigned. If you'd send us that teacher's email address, we can
send the answer directly there.
But seriously, people here are very careful not to do assignments for
people. If you get stuck, they're more than willing to
I apologize in advance for not actually reading through your code
beyond the point where it began using constructs that I'm not familiar
with, but I will give some advice that may or may not be helpful.
You're trying to return '(x). What you're actually returning is
(x)--an application of the
In my on-again, off-again flirtations with the sandbox, I have hit an
error that I don't think I've seen before.
I created a sample student file with a comment box in it. When I try
to load it into a sandbox evaluator, I get the error
file-exists?: `exists' access denied for
Søgaard
Den 18/03/2011 kl. 20.42 skrev Robby Findler ro...@eecs.northwestern.edu:
Isn't that some code you wrote?!
Robby
On Fri, Mar 18, 2011 at 2:28 PM, Jens Axel Søgaard
jensa...@soegaard.net wrote:
2011/3/18 Todd O'Bryan toddobr...@gmail.com:
Given that Scribble does it, I imagine
?
If not, I guess you could put together a script that stuck
(racketblock ...) around everything or the module-enhanced variant,
which makes it into a scribble file and then run scribble --html on
that.
Robby
On Fri, Mar 18, 2011 at 1:22 PM, Todd O'Bryan toddobr...@gmail.com wrote:
Given
I don't think they do.
I've created a compressed /usr/share directory that, if unpacked and
merged with what's already there, should register a mime type for
application-x-racket, create a menu item in Applications/Programming,
and create icons for both .rkt files and DrRacket itself.
Here's a
And now I have unresolved tension...
On Fri, Feb 11, 2011 at 1:20 AM, Paul Steckler st...@stecksoft.com wrote:
In case you haven't seen it:
http://xkcd.com/859/
-- Paul
_
For list-related administrative tasks:
Thank you. I feel better. :-)
On Sat, Feb 12, 2011 at 8:13 AM, Robby Findler
ro...@eecs.northwestern.edu wrote:
)
On Sat, Feb 12, 2011 at 6:43 AM, Todd O'Bryan toddobr...@gmail.com wrote:
And now I have unresolved tension...
On Fri, Feb 11, 2011 at 1:20 AM, Paul Steckler st...@stecksoft.com
I think this is a bug...
#lang racket
(struct lyst (kar kdr)
#:mutable
#:transparent)
(define-struct liist (kar kdr)
#:mutable
#:transparent)
(shared ([a (lyst 7 a)])
a)
(shared ([b (make-liist 7 b)])
b)
produces
(lyst 7 #undefined)
#0=(liist 7 #0#)
In other words, you have to
It appears that image-color? from 2htdp/image returns true no matter
what string you give it.
Is there some other function that actually checks to see if a color is defined?
Todd
_
For list-related administrative tasks:
You might try installing it from the PPA that Jon Rafkind set up:
Information page: https://launchpad.net/~plt/+archive/racket
I saw something similar and the problem was that I was running 64-bit
Ubuntu and the script installs 32-bit binaries, so I needed to install
the 32-bit compatibility
OK, I understand that the template language in (define-syntax ...)
doesn't give you access to the full panoply of Racket-ness. But I
really want to manipulate the template variables before passing them
on to the next step in the expansion. I've tried (define-for-syntax
..) and a couple of other
Thanks, all! It was figuring out how to rename things on the way out
that I was having trouble with. :-)
On Tue, Jan 18, 2011 at 11:06 AM, Noel Welsh noelwe...@gmail.com wrote:
On Tue, Jan 18, 2011 at 3:57 PM, Todd O'Bryan toddobr...@gmail.com wrote:
Is it possible to redefine primitives, like
Thanks so much for doing this! I have ppa's for several other programs
and they're so much more convenient than having to handle upgrades and
installations manually.
On Fri, Jan 14, 2011 at 5:15 PM, Jon Rafkind rafk...@cs.utah.edu wrote:
There was a convenient button on the launchpad website
!), but there are no examples, and the things I've
tried at random haven't been at all successful.
Todd
On Mon, Jan 10, 2011 at 8:51 PM, John Clements
cleme...@brinckerhoff.org wrote:
On Jan 10, 2011, at 10:51 AM, Todd O'Bryan wrote:
Thanks for the pointer. I had hoped to avoid making two passes
On Tue, Jan 11, 2011 at 5:28 AM, Noel Welsh noelwe...@gmail.com wrote:
On Mon, Jan 10, 2011 at 9:53 PM, Greg Hendershott
greghendersh...@gmail.com wrote:
What does it mean for the GC to collect a negative number of bytes?
I'm ducking this one...
Clearly it means that the garbage collector
parsers (not necessarily for
scribble).
Hope this helps,
Laurent
P.S. : I know Lazy-doc is probably not really suited to document packages,
especially for a Scheme community, but I was young... ;)
On Sat, Jan 8, 2011 at 16:36, Todd O'Bryan toddobr...@gmail.com wrote:
I'm trying to do
I'm trying to do some analysis of my student's source files. Trying to
grade 90 assignments per week by brute force with no TAs just doesn't
work.
I want to pull out things like data definitions, contracts, templates,
etc., so I can auto-grade the ones that are what I expect them to be,
and
on all edges in the
usual way.
At Sun, 26 Dec 2010 10:03:38 -0500, Todd O'Bryan wrote:
Actually, I lied. It turns out that you can get a resize control in
the bottom left corner of the window, but that's the only place I've
found that works.
On Sun, Dec 26, 2010 at 10:01 AM, Todd O'Bryan
I just installed DrRacket on Ubuntu 10.10, both from the binary and
compiled from source to be sure the problem existed in both, and I
can't resize the window. The target area for the resize controls has
always been very small (maybe a pixel or two), but I think it just
went to non-existent.
Todd
Here's an algorithm for converting from normal math to Racket.
Write your expression:
people * ticket-price - (number-of-shows * 20 + people * ticket-price)
Notice that I didn't put parentheses anywhere that order of operations
didn't require them.
Now, add exactly one pair of parentheses for
in a row and are just there to make visual parsing
easier.)
Hope that helps,
Todd
On Wed, Dec 22, 2010 at 10:22 AM, Todd O'Bryan toddobr...@gmail.com wrote:
Here's an algorithm for converting from normal math to Racket.
Write your expression:
people * ticket-price - (number-of-shows * 20
On Sat, Dec 18, 2010 at 10:03 PM, Todd O'Bryan toddobr...@gmail.com wrote:
Is there some equivalent of regexp-match* that returns a list of all
the (non-overlapping) matches in a string.
I want something like:
(regexp-match*-clusters #px(?:^|\\s+)([A-Z]) This gets Initial CAPS, I
hope)
'((T T
Is there some equivalent of regexp-match* that returns a list of all
the (non-overlapping) matches in a string.
I want something like:
(regexp-match*-clusters #px(?:^|\\s+)([A-Z]) This gets Initial CAPS, I
hope)
'((T T) ( I I) ( C C) ( I I))
Any luck?
Thanks!
Todd
Is there some way, short of rewriting pretty-print myself, to signal
where I want line-breaks when printing an s-expr?
For example, suppose I have '(a b c d), and I'd like it displayed as:
(a b
c
d)
Is there a clever way to do that, or am I in for some work?
Todd
Note that
#lang htdp/bsl
is not quite the same as choosing the Beginning Student language from
the menu. In particular, the #lang version (which is newer and toward
which DrRacket seems to be moving, so that choosing languages and
adding teachpacks will actually be in the code, rather than some
I'm trying to read a student program (which might include images or
not) as text, just so I can look at it.
I tried this:
#lang racket
(require wxme)
(define/contract (read-assignment-file path)
(- (or/c string? path-string?) bytes?)
(let* ([the-path (if (path-string? path)
I should mention, this is using the latest nightly build and I got the
error when I did
(read-assignment-file /path/to/valid/racket/file.rkt)
Todd
On Fri, Oct 22, 2010 at 10:57 AM, Todd O'Bryan toddobr...@gmail.com wrote:
I'm trying to read a student program (which might include images
I know this has come up on the list before, and I've reread those
threads but am little confused.
Here's a sample student program file:
--
; volume-of-solid: number number number - number
; given the length,
Now I have to figure out how to get to Dallas to hear Matthias's address...
On Tue, Oct 5, 2010 at 6:57 PM, geb a ge...@yahoo.com wrote:
Congratulations! It is well deserved.
Dan
--- On Tue, 10/5/10, Marco Morazan moraz...@gmail.com wrote:
From: Marco Morazan moraz...@gmail.com
Subject:
I think sound is still something that we don't have a good solution
for, yet. (Any college students on the list who need a little
independent study project to work on? I think there are free sound
libraries that work on Mac/Windows/Linux, but how to wire them up is a
little problematic, at least
universe uses strings instead of symbols, now.
Try (key=? x up), etc.
Also, you'll need to be in Advanced language for print (or whatever
print is in Advanced Language), I think.
Todd
On Sun, Oct 3, 2010 at 9:26 PM, Shriram Krishnamurthi s...@cs.brown.edu wrote:
Are you using big-bang?
On Sun, Sep 19, 2010 at 8:57 PM, Shriram Krishnamurthi s...@cs.brown.edu
wrote:
In replying to the below, I'm not ignoring the rest of your message.
By, the way, why'd you decide on numeq instead of
number=?.
I don't think there's a good verbal choice here (though numeq is
especially
The Jaunty version does work.
I've created a script that downloads and installs the Ubuntu version
in the /opt directory, in a folder called /opt/plt-version# with a
symbolic link at /opt/plt. It also installs a desktop file so that
DrRacket appears in the Applications menu, and adds a MIME type
I run DrRacket on Ubuntu 10.04 with the build for Ubuntu Jaunty. If
you're using 64-bit Ubuntu, you have to install the 32-bit support
libraries since the binary is built for 32-bit, but that shouldn't
have affected your compiled version.
I have successfully run the most recent DrRacket on a
I was playing with the signatures that Matthias mentioned as being in
the pipeline for future inclusion, and just wanted to start a
discussion before they get locked in.
In full Racket, there's a form called define/contract that works like this:
#lang racket
(define/contract (distance x1 y1 x2
You downloaded the Windows installer to your Windows 7 machine and
double-clicked it, I assume. What happened then?
On Sun, Aug 15, 2010 at 12:26 PM, Michael Holford
michaelholf...@gmail.com wrote:
To whom it may concern,
I am new to Racket. Have done Basic and Visual Basic. I downloaded
looks like this:
(cond
[(mouse-in? 248 x 424 570 y 649) (set-world-background blah)]
...
Matthew will be happy?
On Aug 1, 2010, at 6:14 PM, Todd O'Bryan wrote:
You'd create the new world and set field values using mutators.
So
if (x 248 x 424 y 570 y 649) {
SState
I'm trying to write a macro to provide functional mutators for the
teaching languages. Here's the main construct:
(define-syntax (define-struct-with-setters stx)
(syntax-case stx ()
[(_ id fields)
(let ([field-names (syntax-list #'fields)])
#`(begin
(define-struct id
the teaching language instead of breaking
hygiene?
Robby
On Tue, Aug 3, 2010 at 7:02 AM, Todd O'Bryan toddobr...@gmail.com wrote:
I'm trying to write a macro to provide functional mutators for the
teaching languages. Here's the main construct:
(define-syntax (define-struct-with-setters stx
On Tue, Aug 3, 2010 at 9:17 AM, Matthias Felleisen matth...@ccs.neu.edu wrote:
You are entitled to as many peeves as you'd like. The neat thing
is that Racket's identifier syntax is liberal and allows you to
use dots. I have been doing so for years :-) and I didn't complain
to the mailing
Two questions:
1. Is this homework? People occasionally get help with homework here,
but if you try to get help without making clear that that's the
situation, people have also been known to track down the teacher who
gave the assignment and send him/her a copy of your message.
2. What are
So, Windows seems to be able to open files with modified bitmaps, but
it's not happy about saving or pasting them.
Try this:
Insert an image.
Crop it in the Interactions window.
Try to copy and paste that image back up to the top.
This is on the latest nightly build.
What's worse, it tries to
in the student languages?
Todd
On Sun, Aug 1, 2010 at 5:11 PM, Richard Cobbe co...@ccs.neu.edu wrote:
On Sun, Aug 01, 2010 at 03:11:43PM -0400, Todd O'Bryan wrote:
There are a couple of things we could do to help with the underlying
cause. I've been looking at OCaml recently, and the construct
You'd create the new world and set field values using mutators.
So
if (x 248 x 424 y 570 y 649) {
SState newState = new SState();
newState.setBackground(blah);
newState.setButton(blah2);
...
}
On Sun, Aug 1, 2010 at 5:22 PM, Richard Cleis rcl...@mac.com wrote:
[snip]
I
, and this program looks like this:
(cond
[(mouse-in? 248 x 424 570 y 649) (set-world-background blah)]
...
Matthew will be happy?
On Aug 1, 2010, at 6:14 PM, Todd O'Bryan wrote:
You'd create the new world and set field values using mutators.
So
if (x 248 x 424 y 570 y 649
On Sun, Aug 1, 2010 at 7:45 PM, Marco Morazan moraz...@gmail.com wrote:
I'd also like to push for earlier introduction of (local ...) in
HtDP/2e. We all know that code duplication is a bad thing and that
giving complex constructs names is one of the easiest forms of
abstraction, but we can't
Right. But we don't let students do that! We don't even let them use
. rest arguments for gosh sake! :-)
Todd
On Sun, Aug 1, 2010 at 10:46 PM, Matthias Felleisen
matth...@ccs.neu.edu wrote:
On Aug 1, 2010, at 8:05 PM, Todd O'Bryan wrote:
In a language with typing and
overloading, you could
Actually, this macro doesn't quite work, because it uses the #lang
racket version of define-struct instead of the version appropriate to
whichever language the student is in: Beginning SL, Intermediate SL,
or Advanced SL.
How would I fix that?
Todd
On Sun, Jul 25, 2010 at 4:16 PM, Todd O'Bryan
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