Making graphs on that might be challenging. Is that the only way?
--
Mathew Kurian
Seven Lakes High School
Cell: 8324932862 | Home: 2814929526
Do all the good you can, by all the means you can,
In all the ways you can, in all the places you can,
At all the times you can, to all the people you can
2htdp/universe I'd say.
Robby
On Monday, October 18, 2010, geb a wrote:
>
>
> --- On Mon, 10/18/10, geb a wrote:
>
>> From: geb a
>> Subject: [plt-edu] real-time graphics for simultion?
>> To: plt-...@list.cs.brown.edu
>> Date: Monday, October 18, 2010, 9:50 AM
>> Hello,
>>
>> I have a few stu
Update to my previous post, I missed a ` character (just ran it to make
sure I was sane). The line is actually:
(list `#(,(regexp-replace* a-string (vector-ref (first T) 0)
(string-append "<<" a-string ">>")
Thanks,
-Everett
On 10/18/2010 03:23 PM, scouic wrote:
Hi all,
here more than
On 10/18/2010 03:23 PM, scouic wrote:
this is the function :
(define (rush! T super-list a-string)
(if (empty? T)
super-list ;; here is the problem
(rush! (rest T)
(append
super-list
(list (regexp-replace* a-string (vector-ref (
Big thanks, this works now \o/
_
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Higher order functions will be what you are looking for. In this case - map
and vector-map.
http://docs.racket-lang.org/reference/pairs.html#(def._((lib._racket/private/map..rkt)._map))
http://docs.racket-lang.org/reference/vectors.html#(def._((lib._racket/vector..rkt)._vector-map))
Use map to
Hi all,
here more than three hours that i'm locked on a function, i defer to you =)
My problem : i have a list of vectors, each vectors represents a text syntax
(not html syntax, just text), and were created with the result of a format
sqlite SELECT operation.
For example, my list of vectors L is
Three minutes ago, Danny Yoo wrote:
> > The resulting zip/tar/tgz files should be unpackable by the
> > standard tools. (There is no racket code that does that, since
> > creating a standard archive is easy, but parsing one runs into
> > problems due to incompatibilities of these archives.)
>
> O
> The resulting zip/tar/tgz files should be unpackable by the standard
> tools. (There is no racket code that does that, since creating a
> standard archive is easy, but parsing one runs into problems due to
> incompatibilities of these archives.)
Ok. Is there a standard library for packaging up
About a minute ago, Danny Yoo wrote:
> How do I untar or unzip the files produced by the zip and tar
> modules? I've been staring at:
>
> http://docs.racket-lang.org/file/tar.html
> http://docs.racket-lang.org/file/zip.html
>
> I can create archives perfectly well: it's the decompression
How do I untar or unzip the files produced by the zip and tar modules?
I've been staring at:
http://docs.racket-lang.org/file/tar.html
http://docs.racket-lang.org/file/zip.html
I can create archives perfectly well: it's the decompression step that
I'm clueless about.
Am I allowed to use the HtDP brand name :)?
Online at
http://www.brinckerhoff.org/clements/csc123-fa10/sound-primer/sound-primer.html
I have about a dozen pages of HtDP-style text+exercises built on top of my
RSound planet package. The challenge is how to deal with generating sounds: do
you
Sam Tobin-Hochstadt wrote at 10/18/2010 11:43 AM:
Typed Racket is designed to be used in modules. The REPL is supported for
simple interactions, but the form-at-a-time nature makes some things much
harder, and some things impossible (such as mutually-recursive functions).
Since some of these
--- On Mon, 10/18/10, geb a wrote:
> From: geb a
> Subject: [plt-edu] real-time graphics for simultion?
> To: plt-...@list.cs.brown.edu
> Date: Monday, October 18, 2010, 9:50 AM
> Hello,
>
> I have a few students solving differential equations using
> scheme. Specifically, we have three firs
holy crab! why would someone in his own mind prefer Emacs over a
modern and slick DrRacket environment?
Let the old OS RIP before it gets sentient and wreaks (even more)
havoc onto the world!
On Thu, Oct 14, 2010 at 2:28 AM, Scott McLoughlin wrote:
> I tried (require typed/scheme) in the schem
The Journal of Functional Programming publishes book reviews. I have
just updated: list of books for review in the journal of functional
programming, available here:
http://www.cs.kent.ac.uk/people/staff/sjt/JFP/available.html
which also has a link to a set of review guidelines. If you review a
>> I speculate that an operation of 'update x1' is captured therefore
>> discarded. But how this is implemented? Do you have a reference
>> implementation or something that I can consult?
>
> Do what Matthias suggested -- but the code in question is pretty
> tricky. You can also browse the srfi
On Sun, Oct 17, 2010 at 9:32 PM, Hari Prashanth wrote:
> Currently Typed Racket at repl does not completely work...
Yes, and this is likely to remain the case, at least in general.
Typed Racket is designed to be used in modules. The REPL is supported
for simple interactions, but the form-at-a-ti
Four hours ago, Keiko Nakata wrote:
> Hello,
>
> Can I regard this behavior as intended semantics?
Yes.
> I speculate that an operation of 'update x1' is captured therefore
> discarded. But how this is implemented? Do you have a reference
> implementation or something that I can consult?
Do
I am fairly new to scheme and I have been experimenting with the Graphics
Toolkit from Racket.
I am trying to work with a background image and have everything else be on
top of that image. The problem is that most area's come with a grey
background that I can't seem to get rid of. So what I ha
2010/10/18 김태윤 :
> how does call/cc and let/ec exactly works?
Read
http://www.cs.indiana.edu/hyplan/dfried/appcont.pdf
--
Jens Axel Søgaard
_
For list-related administrative tasks:
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thank you for your replying
does call/cc always working with let/ec?
when it comes to compare with your code, it looks like..
call/cc is meaning of "get out of this function and evaluate next function
and comeback (to inside of let/ec) for evaluate rest of the code"
is it right?
if so, I don't und
If you use drracket to code, use check syntax on your expression, right-click
on delay or force, and request to jump to the definition. This will trigger an
error message --ignore it! Look for force/ and force and delay to understand
how things are handled in this world.
Racket truly is an op
Hello,
Can I regard this behavior as intended semantics?
(let* ([x0 (delay (control k I))]
[x1 (delay (force x0))])
(reset (force x1)) (force x1) 0)
raises an error 'force: reentrant promise x1'.
I speculate that an operation of 'update x1' is captured therefore discarded.
But how this
hello
I am thinking of such a code like..
#lang scheme
(require racket/gui)
(let ([v (let/ec out
(dynamic-wind
(lambda () (display "in "))
(lambda ()
(display "pre ")
(display (call/cc out))
#f)
Scott McLoughlin wrote at 10/18/2010 12:18 AM:
The Web site at the URL you name still claims that the Quack
available for download is from "2009-10-14" - a year old.
Perhaps it's because my rigorous quality assurance process for Emacs
hacks takes a year for each release.
Actually, that was
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