Hi,
I was wondering if anyone uses DrRacket as a 'notebook' like the 'IPython
Notebook'[1]? (perhaps using slideshow?)
It strikes me as a middle ground between the interactions repl and
slideshow.
[1] http://ipython.org/notebook.html
[2]
http://software-carpentry.org/blog/2013/03/using-noteboo
Does anyone know of any groups in Japan who are using Racket for teaching e.g.
like the 'Bootstrap' programmes in the US?
- Steve
Racket Users list:
http://lists.racket-lang.org/users
Hello Carl,
I found a location in mras.rkt where I comment out the provide for the map-2
function, the program runs, and when I re-instate it, it fails. The section of
code is:
;; map-2
(provide
(proc-doc/names map-2
(procedure? list? list? . -> . list?)
(pr
Vincent St-Amour writes:
> You can use the `#:defaults' clause of `define-generics' for that. The
> documentation included in recent snapshots includes examples of its use:
>
>
> http://www.cs.utah.edu/plt/snapshots/current/doc/reference/struct-generics.html
>
> You can also use it t
On 2013-09-06 15:46:20 +0200, Konrad Hinsen wrote:
> The reason for wanting to implement the methods separately is plain
> economy: I have five structures that can use a strictly identical
> implementation for gen:dict, and I want to write the code only once.
You can write the method implementatio
Is there a way to inherit methods from a parent struct?
If I'm not mistaken, it's not what #:defaults and other keywords are for.
For example, the following fails:
#lang racket
(require racket/generic)
(define-generics g
(foo g)
(bar g))
(struct a ()
#:methods gen:g
[(define (foo g) '(fo
Asumu Takikawa writes:
> You can write the method implementations as plain function definitions
> in some module, e.g.,
>
> (define (my-dict-ref ...) ...)
> ...
> (provide my-dict-ref ...)
>
> and then in each structure you can do
>
> (struct particular-dict (...)
> #:met
Getting worse: the workaround does not even work anymore and I can't use
DrRacket anymore...
It does work correctly from command line racket though.
On Fri, Sep 6, 2013 at 5:14 PM, Laurent wrote:
> Hi,
>
> In DrRacket, I keep getting the following error on some files that are
> part of a devel
Does it help to disable drracket's online compilation (in the language
dialog)?
Robby
On Friday, September 6, 2013, Laurent wrote:
> Getting worse: the workaround does not even work anymore and I can't use
> DrRacket anymore...
> It does work correctly from command line racket though.
>
>
>
> On
It does indeed!
FWIW, I also get more and more the following popup error:
car: contract violation
expected: pair?
given: '#hash()
context...:
/home/orseau/build/racket/racket/collects/racket/private/serialize.rkt:639:2:
deserialize
/home/orseau/build/racket/pkgs/drracket-pkgs/drracket/drra
On Fri, Sep 6, 2013 at 5:56 PM, Matthew Flatt wrote:
> Does `raco make` report the same error?
>
No, it does not.
> I don't suppose that you have any calls to
> `syntax-local-make-internal-definition-context` in your code?
>
You suppose well.
>
> At Fri, 6 Sep 2013 17:14:28 +0200, Laurent w
Interesting! I'm already using syntax classes and attributes to factor
interpreting primitive functions out of the main `interp' macro, too...
I realized yesterday that I don't necessarily want the code to always
expand to uses of `&&&' and `>>>'. There may be other interpretations I
want to d
Just wondering about a meetup for any interested Racketeers that are in the
Vancouver and/or Toronto area. Our company is based in Vancouver but we do
a lot of travel to Toronto, so I thought I'd put out some feelers to see
what the landscape looks like up here :).
Thanks.
--
Talk to you soon,
You've stumbled upon two different bugs here.
1. Submodules and Typed Racket interact badly -- this is a bug in the
internals of Racket, but won't be fixed in the near future. The
workaround, as you discovered, is to use a separate files.
2. `struct-out` and `struct:` interact badly. This is a b
Does `raco make` report the same error?
I don't suppose that you have any calls to
`syntax-local-make-internal-definition-context` in your code?
At Fri, 6 Sep 2013 17:14:28 +0200, Laurent wrote:
> Hi,
>
> In DrRacket, I keep getting the following error on some files that are part
> of a developm
At Thu, 05 Sep 2013 09:01:58 -0600,
Neil Toronto wrote:
> The best advice I have is to keep performance-critical loops either all
> typed or all untyped, unless the only things that cross the contract
> boundary are flat first-order datums like flonums, strings and
> vectors. (The math library's fl
Good to know. I'll just be patient then!
On Fri, Sep 6, 2013 at 4:54 PM, Asumu Takikawa wrote:
> On 2013-09-06 16:38:56 +0200, Laurent wrote:
> >Is there a way to inherit methods from a parent struct?
> >If I'm not mistaken, it's not what #:defaults and other keywords are
> for.
>
> Thi
On 2013-09-06 16:38:56 +0200, Laurent wrote:
>Is there a way to inherit methods from a parent struct?
>If I'm not mistaken, it's not what #:defaults and other keywords are for.
This is currently not possible, which is a bug/limitation of generic
interfaces and not a design feature.
The is
Yes, tongue firmly planted in cheek.
On Fri, Sep 6, 2013 at 2:19 PM, Robby Findler
wrote:
> Hey, we're all friends here (which is a separate question from the number
> of Gods, I suppose :). Marc has done same amazing stuff with Gambit & co!
>
> Robby
>
>
> On Fri, Sep 6, 2013 at 4:11 PM, Scott
On Fri, Sep 6, 2013 at 7:05 PM, Robby Findler
wrote:
> I've pushed a change that should swallow those errors.
>
Thanks. I won't be able to test before Monday.
> They are likely coming about because of an incomplete build, I guess.
> Somehow the blueboxes files (which are built as part of the do
Hello,
I would like to use a 'serialize-struct' in typed/racket. It seems
there is no
'serialize-struct:' built in typed/racket.
So i have decided to put the struct into a specific submodule and
require/type
the structs.
;;test.rkt
#lang typed/racket
(module data-structs racket
Hey, we're all friends here (which is a separate question from the number
of Gods, I suppose :). Marc has done same amazing stuff with Gambit & co!
Robby
On Fri, Sep 6, 2013 at 4:11 PM, Scott Klarenbach wrote:
> Thanks Marc. Let me add that Schemers and Lispers are welcome and will
> suffice
Hi,
In DrRacket, I keep getting the following error on some files that are part
of a development package:
../../../../../build/racket/racket/collects/compiler/cm.rkt:430:6: write:
unsealed local-definition or module context found in syntax object
This prevents the compilation of the rkt files.
T
Alvin,
This looks like a bug in errortrace, one of the compiler extensions
DrRacket uses to provide debugging information at runtime. Here's a
workaround you can use:
1. Open the "Language" menu.
2. If there is no right-hand pane to the menu, click the "Show Details"
button in the lower left
I've pushed a change that should swallow those errors.
They are likely coming about because of an incomplete build, I guess.
Somehow the blueboxes files (which are built as part of the docs build)
appear to have been corrupted.
Robby
On Fri, Sep 6, 2013 at 10:42 AM, Laurent wrote:
> It does i
Thanks Marc. Let me add that Schemers and Lispers are welcome and will
suffice in lieu of those that have already been converted to the one true
God. :)
sk
On Fri, Sep 6, 2013 at 12:58 PM, Marc Feeley wrote:
> Not in Vancouver or Toronto, and not for Racket, but if you come to
> Montreal I'll
My talk went down well and the audience of mainly Clojurists and Haskellers
were engaged and few people were keen to go away and have a play.
One participant reddited the slides and they've been downloaded almost 2000
times so far.
The top comment on reddit included a piece of Haskell advocacy
(s
Glad to hear it!
As for the quickcheck/contracts interaction, Racket has some (not
completely polished) support for exactly that; it works by randomly
generating inputs based on the contracts and trying to get blame to fall on
the tested function.
Robby
On Fri, Sep 6, 2013 at 5:01 PM, Daniel P
> The 2-3x estimate was for runtime, in the case of for loops with many
> iterations (ie millions). I've just pushed some optimizations though
> that cut the slowdown to maybe 1.5-2x, in preliminary experiments. So
> you should "pkg update" (or pull if you are using the source directly)
> to get th
Good evening,
this may've come up before, but I looked through the last few messages
and did a bit of searching, and couldn't find anything about this
problem. My apologies if this is already a known issue.
When DrRacket is installed, it comes with 3 pre-installed teachpacks,
including image
Unfortunately, this is the way things work. Those are actually two
different teachpacks and the error message that you are getting is a poorly
worded "these two teachpacks conflict with each other".
Is there perhaps some other behavior you'd prefer?
And, I should also point that even if we do fin
Hi Elena,
You can also remove the teachpack from column one. It is, however, simple
enough for students to only add the teachpack in column 2. Once you add a
teachpack, it remains added until it is removed. My first year students
run DrRacket without removing the teachpack all semester.
Marco
O
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