=
Call for Participation
The 15th ACM SIGPLAN International Conference
on Functional Programming (ICFP 2010)
http://www.icfpconference.org/icfp2010/
I think that could work well in drracket. It is careful never to
insert tab characters into your program when it indents (for the
problems listed in the beginning of that essay) so there is relatively
little existing use of tabs.
And drracket's editor class is now implemented in racket, so anyone
Nice!
add1
On Mon, Aug 2, 2010 at 11:35 AM, Dave Gurnell wrote:
> I saw this on the Internets a while ago:
> http://nickgravgaard.com/elastictabstops/
> I thought it was pretty clever... it could be relevant here. There's a demo
> about half way down the page.
> -- Dave
> On 2 Aug 2010, at 16:26
That's because it decides when to break greedily. It really ought to be
a constraint solver.
Like TeX for Racket programs. Yeah.
Neil T
Robby Findler wrote:
Pretty-print doesn't work all that well, when it gets close up against
the 80 column limit. At least, that's my experience reading its
o
I think I've fixed this bug and pushed the change to git. It seems to
have been specific to images that don't have an alpha channel (eg
gifs). If that matches your experience, then likely it is the same
bug.
Robby
On Mon, Aug 2, 2010 at 11:16 AM, Todd O'Bryan wrote:
> So, Windows seems to be abl
On Mon, Aug 2, 2010 at 17:35, Dave Gurnell wrote:
> I saw this on the Internets a while ago:
>
> http://nickgravgaard.com/elastictabstops/
>
> I thought it was pretty clever... it could be relevant here. There's a
> demo about half way down the page.
>
Nice !
Now can I have that in DrRacket? :)
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 sa
> -Original Message-
> From: robby.find...@gmail.com
> [mailto:robby.find...@gmail.com] On Behalf Of Robby Findler
> Sent: 02 August 2010 17:41
> To: Jos Koot
> Cc: Horace Dynamite; users@racket-lang.org
> Subject: Re: [racket] syntax, differently
>
> Pretty-print doesn't work all that we
Cute!
-
Of course, this is just recreating TeX's \halign. Since the modern
TeX is Scribble, as soon as Racket adopts Scribble as its layout
language in the editor, this should be trivial to do. (-:
-
Last summer my student Brendan Hickey worked with me to prototype a
Scheme editor in
Pretty-print doesn't work all that well, when it gets close up against
the 80 column limit. At least, that's my experience reading its
output.
Robby
On Mon, Aug 2, 2010 at 9:50 AM, Jos Koot wrote:
> pretty-print (with (pretty-print-columns 80))?
> jos
>
>> -Original Message-
>> From: use
I don't really have a rationale as to why, merely an absence of one as
to why not.
Robby
On Mon, Aug 2, 2010 at 9:43 AM, Jos Koot wrote:
> WQhy would this be tricky?
> Jos
>
>> -Original Message-
>> From: users-boun...@racket-lang.org
>> [mailto:users-boun...@racket-lang.org] On Behalf O
I saw this on the Internets a while ago:
http://nickgravgaard.com/elastictabstops/
I thought it was pretty clever... it could be relevant here. There's a demo
about half way down the page.
-- Dave
On 2 Aug 2010, at 16:26, Jos Koot wrote:
> +1, I do this often in my code (in which case
+1, I do this often in my code (in which case I don't touch auto-redent-all)
Jos
_
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Laurent
Sent: 02 August 2010 17:19
To: PLT-Scheme Mailing List
Subject: [racket] auto-spacer
Speaking of DrRacket U
Speaking of DrRacket UI, one thing that I'd really appreciate is an
"auto-spacer" for `define' and `let'.
Let me explain what I mean.
I often have things like:
(define something 3)
(define some-other-thing 4)
(define whatever-you-like 42)
And I like the right-hand-side to be aligned to make
pretty-print (with (pretty-print-columns 80))?
jos
> -Original Message-
> From: users-boun...@racket-lang.org
> [mailto:users-boun...@racket-lang.org] On Behalf Of Jos Koot
> Sent: 02 August 2010 16:44
> To: 'Robby Findler'; 'Horace Dynamite'
> Cc: users@racket-lang.org
> Subject: Re: [ra
On Mon, Aug 2, 2010 at 10:30 AM, Horace Dynamite
wrote:
> So I suppose I was being a little too aggressive at the suggestion. I
> do wonder how tricky it will be do have a line-breaking routine that
> can take as input the program I posted, and produce as output the
> program you returned.
It doe
From: "Jos Koot"
> Calling a continuation does not undo side effects.
This seems to be at the base line.
Keiko
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Matthias,
You're trimming of my "verbose" English has left one procedure with a
contract thats completely wrong, a common remanent I believe of being
too concise!
;; possible-states accumulate all the possible (incorrect) future
;; boat loads, given the current state.
That (incorrect) by itself
WQhy would this be tricky?
Jos
> -Original Message-
> From: users-boun...@racket-lang.org
> [mailto:users-boun...@racket-lang.org] On Behalf Of Robby Findler
> Sent: 02 August 2010 16:34
> To: Horace Dynamite
> Cc: users@racket-lang.org
> Subject: Re: [racket] syntax, differently
>
> On
> -Original Message-
> From: users-boun...@racket-lang.org
> [mailto:users-boun...@racket-lang.org] On Behalf Of Horace Dynamite
> Sent: 02 August 2010 16:31
> To: Robby Findler; users@racket-lang.org
> Subject: Re: [racket] syntax, differently
>
> > That said, if you hit return after ea
Call/cc captures all required variables needed for its continuation, but it
does not capture their states. How about a variable bound to a box that have
been captured in a continuation? Alter the content of the box and call the
continuation. It sees the very same box with the new content. Calling a
On Mon, Aug 2, 2010 at 9:30 AM, Horace Dynamite
wrote:
> I
> do wonder how tricky it will be do have a line-breaking routine that
> can take as input the program I posted, and produce as output the
> program you returned.
That seems very tricky, at least to me.
Robby
Yeah yeah yeah! Jos & Matthias, you win also. :-)
I'd be amazed if a line breaking routine could make all these
observations automatically.
Horace.
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1 minutes, 3 alpha renamings, one line break, and two cuts in extremely verbose
English, et voil`a, it fits:
;; : state -> (listof state)
;; all possible successor states that can be reached in one boat crossing
(define (compute-possible-states state)
(local [;; how-many : symbol bl -> num
> That said, if you hit return after each 'cond' (instead of keeping the
> first clause on the same line), you're down to 82 chars. If you break
> define definitions in the innermost local, you're below the limit. I
> personally would probably also put a return after the call to
> make-state, getti
Within 80 columns (not counting the startiong comment.
Hope your mailer does not insert or remove line-breaks.
#lang racket
;; : state -> (listof state) ;; given a state, compute
all possible successor states that can be reached in one boat crossing
(define (compute-possible-states state)
(loc
This code looks nice to me!
That said, if you hit return after each 'cond' (instead of keeping the
first clause on the same line), you're down to 82 chars. If you break
define definitions in the innermost local, you're below the limit. I
personally would probably also put a return after the call t
On Aug 2, 2010, at 9:56 AM, Stephen Bloch wrote:
> Besides, absolute beginning programmers don't have all that many functions to
> remember -- under 200 in my whole book, probably under 100 in HtDP.
DrRacket comes with a programmer-initiated name completion feature: ctrl .
It is not quite w
On Mon, Aug 2, 2010 at 2:02 PM, Marco Morazan wrote:
> Perhaps, you should consider making separate functions for each nested
> cond and nested local. There is nothing "easy to read" about code with
> the shape above. One cond and one local per function is a good rule of
> thumb.
Point taken, per
I may think how call/cc should deal with delay's (call-by-need) is a moot point
(theory vs implementation).
Keiko
From: Matthias Felleisen
Subject: Re: [racket] begin vs +
Date: Mon, 2 Aug 2010 10:00:39 -0400
>
> call/cc captures the environment when it creates a procedural representation
> o
call/cc captures the environment when it creates a procedural representation of
the continuation, just like lambda. The two are doing more or less the same
thing with two differences:
(1) lambda uses an explicit expression to create a procedure while call/cc
uses an implicit expression (the
Because all the time 9 is added to 2 yielding 11.
Jos
> -Original Message-
> From: users-boun...@racket-lang.org
> [mailto:users-boun...@racket-lang.org] On Behalf Of Keiko Nakata
> Sent: 02 August 2010 14:55
> To: mfl...@cs.utah.edu
> Cc: users@racket-lang.org
> Subject: Re: [racket] be
From: Sam Tobin-Hochstadt
> On Mon, Aug 2, 2010 at 9:48 AM, Keiko Nakata
> wrote:
> > Or, call/cc does not capture the state?
>
> `call/cc' does not capture the state of the heap (such as the contents
> of boxes).
Thanks! This makes it very clear.
This should also mean I cannot undo force-ing
On Aug 1, 2010, at 12:34 AM, Mathew Kurian wrote:
> 1.When you click on a defined function name, it is necessary that all the
> same phrases are highlighted throughout the whole file.
I don't think that's really what you want. Consider the following (bad) code
example:
(define x 17)
..
(
On Mon, Aug 2, 2010 at 15:48, Keiko Nakata wrote:
> From: Laurent
>
> > Maybe you could use `(let () *body ...*)' instead? It should be closer to
> > your intentions.
>
> Can you tweak my code
>
I'm not at ease with continuations too and I wouldn't want to give you wrong
answers so I let gurus a
On Mon, Aug 2, 2010 at 9:48 AM, Keiko Nakata wrote:
> Or, call/cc does not capture the state?
`call/cc' does not capture the state of the heap (such as the contents
of boxes).
--
sam th
sa...@ccs.neu.edu
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From: Laurent
> Maybe you could use `(let () *body ...*)' instead? It should be closer to
> your intentions.
Can you tweak my code
(let ([d (box #f)] [a (box 0)])
(print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3))) (unbox
a)))
((unbox d) 9))
or give me a hint, so that it
On Mon, Aug 2, 2010 at 15:23, Keiko Nakata wrote:
> Hi,
>
> From: Matthew Flatt
>
> > At Mon, 02 Aug 2010 21:54:54 +0900 (JST), Keiko Nakata wrote:
> > > Why this code
> > >
> > > (let ([d (box #f)] [a (box 0)])
> > > (print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3)))
> (unbox
Hi,
From: Matthew Flatt
> At Mon, 02 Aug 2010 21:54:54 +0900 (JST), Keiko Nakata wrote:
> > Why this code
> >
> > (let ([d (box #f)] [a (box 0)])
> > (print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3)))
> > (unbox
> > a)))
> > ((unbox d) 9))
> >
> > prints 5, rat
One possible source of confusion: begin that appears at the top-level
(of a module or in the REPL) or in a definition context (like the body
of a let expression or lambda expression) is treated specially from
other begins; specifically, it is treated as if the contents of the
begin were separate ex
At Mon, 02 Aug 2010 21:54:54 +0900 (JST), Keiko Nakata wrote:
> Actually, I didn't see.
>
> Why this code
>
> (let ([d (box #f)] [a (box 0)])
> (print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3))) (unbox
> a)))
> ((unbox d) 9))
>
> prints 5, rather than 5999?
I
On Mon, Aug 2, 2010 at 7:21 AM, Horace Dynamite
wrote:
> On Sat, Jul 31, 2010 at 4:00 PM, Matthias Felleisen
> wrote:
>
>> 1. Could drracket limit the width of programs in the teaching language world
>> to 80 columns?
>
> As another student, this "feature" would really annoy me. Having read
> M
Actually, I didn't see.
Why this code
(let ([d (box #f)] [a (box 0)])
(print (+ (begin (let/cc k (begin (set-box! d k) (set-box! a 2) 3))) (unbox
a)))
((unbox d) 9))
prints 5, rather than 5999?
Keiko
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On Mon, Aug 2, 2010 at 7:25 AM, Matthias Felleisen wrote:
>
> On Aug 2, 2010, at 7:21 AM, Horace Dynamite wrote:
>
>> I don't understand why instructors can't just explain to students what
>> style they should write in, and shout at them when they unnecessarily
>> break the style. This seems like
On Sun, Aug 1, 2010 at 11:31 PM, Todd O'Bryan wrote:
>> Like this:
>>
>> (define distance
>> (case-lambda
>> ((p q) (distance (posn-x p) (posn-x q) (posn-y p) (posn-y q)))
>> ((x0 y0 x1 y1) (sqrt (+ (sqr (- x0 y0)) (sqr (- x1 y1)))
>>
> Right. But we don't let students do that! We don't e
From: Matthew Flatt
> Each form at the top level is wrapped in a prompt, and the content of a
> top-level `begin' is spliced into the top level.
I see. Otherwise it should diverge.
Thanks,
Keiko
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[Sorry...
I'm well practiced at forgetting to attach the meaningful bits...
Take two!]
Hello all,
I'm using racket and scribble-lp to automatically generate C-code.
I get nice LP documentation of my racket-level scripts, but (by the nature
of what I'm doing) I have code like:
Hello all,
I'm using racket and scribble-lp to automatically generate C-code.
I get nice LP documentation of my racket-level scripts, but (by the nature
of what I'm doing) I have code like:
---
...
--
On Aug 2, 2010, at 7:21 AM, Horace Dynamite wrote:
> I don't understand why instructors can't just explain to students what
> style they should write in, and shout at them when they unnecessarily
> break the style. This seems like a better method that stepping into
> the thorny area of having DrR
At Mon, 02 Aug 2010 20:42:34 +0900 (JST), Keiko Nakata wrote:
> This code prints "hi" twice,
>
> (define d (box #f))
>
> (+ (begin (let/cc k (begin (set-box! d k) 3))) (begin (print "hi") 9))
>
> ((unbox d) 0)
>
> whereas this prints "hi" once
>
> (define d (box #f))
>
> (begin (begin (let/c
Hello,
This code prints "hi" twice,
(define d (box #f))
(+ (begin (let/cc k (begin (set-box! d k) 3))) (begin (print "hi") 9))
((unbox d) 0)
whereas this prints "hi" once
(define d (box #f))
(begin (begin (let/cc k (begin (set-box! d k) 3))) (print "hi"))
((unbox d) 0)
Why?
Keiko
__
On Sat, Jul 31, 2010 at 4:00 PM, Matthias Felleisen
wrote:
> 1. Could drracket limit the width of programs in the teaching language world
> to 80 columns?
As another student, this "feature" would really annoy me. Having read
Matthias' style guidelines on his assignments webpage for HtDP, I was
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