There a #lang python implementation here:
https://github.com/pedropramos/PyonR/tree/master
A paper on it:
https://www.inesc-id.pt/ficheiros/publicacoes/10173.pdf
/Jens Axel
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stx)
(syntax-parse stx
[(_ parms ooo)
#'(list parms ooo)])))]))
(make-id-macro foo)
(do-foo 1 2)
See you on Racket Discourse.
/Jens Axel
Den ons. 24. maj 2023 kl. 06.27 skrev Kevin Forchione :
> Hi guys,
> I’m stumped. In a nutshell I want to
om this group and stop receiving emails from it, send an
> email to racket-users+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
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> <https://groups.google.com
Also - was Racket moved to the Applications ?
It looks like your colleague is opening from the downloaded archive [but I
could be wrong].
Den man. 4. jul. 2022 kl. 13.18 skrev Jens Axel Søgaard <
jensa...@soegaard.net>:
> Can you open it from the terminal:
>
> open /Applicatio
Can you open it from the terminal:
open /Applications/Racket\ v8.5/DrRacket.app
This way any errors will be visible.
/Jens Axel
Den man. 4. jul. 2022 kl. 12.49 skrev Kuang-Chen Lu :
> Hi,
>
> My colleague can’t open a fresh installation of DrRacket. She installed
> the DrRack
I have a little bit of a problem in understanding the function map with
typed/racket.
My problem starts with an application of map which in normal racket is very
straight forward:
> (map car '(("Eins" "One" "Un") ("Zwei" "Dos" "Two" "Deux") ("Drei" "Tres"
"Trois")))
'("Eins" "Zwei" "Drei")
If ma
Try reversing the order for arguments for both fp and f.
/Jens Axel
Den tir. 14. dec. 2021 kl. 19.48 skrev Cyrille DEUSS <
cyrille.de...@gmail.com>:
> #lang racket
> (require racket/format)
>
> (define pp_number
> (lambda (n)
> (~a n #:width 6 #:align
site to receiving as Internet mail the contributions to the
> Discursive forum for Racket <https://racket.discourse.group/>. The
> stewards of Racket <https://racket-lang.org/> have published a facility
> for enlisting as a participant in the Discursive forum for Racket
> <http
info (force (struct-ref beauty)))
(map struct-field-name (struct-info-fields info))
The result is:
'(breed color legs)
Den søn. 31. okt. 2021 kl. 13.06 skrev David Storrs :
>
>
> On Sun, Oct 31, 2021, 7:49 AM Jens Axel Søgaard
> wrote:
>
>> Hi Brian,
>>
>> A
g code.
/Jens Axel
Den søn. 31. okt. 2021 kl. 11.42 skrev Matt Jadud :
> Hi Brian,
>
> Does this help move you forward?
>
> It has been a while since I've stared at macros in Racket, so this might
> be easier...
>
> Also, make sure you're executing this code in a
ites. It worked
"okay", but not great.
The current system works much better.
That said, I understand that the amount of documentation has grown to such
a size, that it can
be difficult for newcomers to navigate. Maybe "cheat sheets" such as
https://docs.racket-lang.org
://developer.apple.com/design/human-interface-guidelines/macos/menus/menu-anatomy/
/Jens Axel
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> .
>
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is, proportional to
1).
Note: This phenomenon that using string-append in a loop is not a Racket
only problem.
It is a common pitfall in many languages.
[1] Remember the famous story of Gauss as a child that calculated
1+2+...1000 ?
https://www.youtube.com/watch?v=Dd81F6-Ar_0
essandro
>
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glegroups.com.
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miliar with macros, I hope the overview will give you a good
start.
If not, the overview skipped a lot of details, so you will need to look at
an
introduction to macros first.
If you are interested, I'll be happy to send you a work-in-progress macro
tutorial
I am working. I am always looking
ks have to be
;; atomic. At the same time, we need some atomic callbacks to be able
;; to escape with an exception.
It matches your observations.
https://github.com/racket/draw/blob/master/draw-lib/racket/draw/unsafe/callback.rkt
/Jens Axel
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Hi Robert,
There are some bindings for Magick in the example folder for the FFI
library.
https://github.com/racket/racket/tree/master/pkgs/racket-doc/ffi/examples
The bindings are in magic.rkt and examples of use are in use-magick.rkt
(see the bottom).
/Jens Axel
Den tir. 11. maj 2021 kl
(such as syntax-case and syntax-parse) are available,
so it is written using only primitive constructs.
That is, that particular file does not represent the usual style of macro
writing.
/Jens Axel
Den søn. 9. maj 2021 kl. 16.13 skrev Ryan Culpepper :
> Here are the three most convenient
CP_Language.html
The code is here:
https://github.com/sicp-lang/sicp/blob/master/sicp/main.rkt
Note that `sicp-pict` provides a modern implementation of the Henderson
picture language.
With colors and high resolution as well as support for pens and brushes.
https://github.com/sicp-lang/sicp/blob/maste
Try integer-length.
https://docs.racket-lang.org/reference/generic-numbers.html?q=integer-length#%28def._%28%28quote._~23~25kernel%29._integer-length%29%29
I don't know how it is implemented.
/Jens Axel
Den tor. 25. feb. 2021 kl. 09.52 skrev Dominik Pantůček <
dominik.pantu...@tru
ared.
>
> Presumably it should say "are not copied".
>
Thanks! The docs are now fixed.
/Jens Axel
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s over real
floating points,
take a look at:
https://docs.racket-lang.org/manual-flomat/index.html
/Jens Axel
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Den tor. 21. jan. 2021 kl. 05.06 skrev Stuart Hungerford <
stuart.hungerf...@gmail.com>:
> My project is really aimed at supporting self-directed learning of
> concepts from abstract algebra.
>
I was taught many years ago that to really understand something to try
> implementing it in a high level
Den tor. 21. jan. 2021 kl. 05.06 skrev Stuart Hungerford <
stuart.hungerf...@gmail.com>:
> On Thursday, 21 January 2021 at 10:22:45 UTC+11 Jens Axel Søgaard wrote:
>
> > Back to your project - what is the goal of the project?
> > Making something like GAP perhaps?
>
ions.
Thanks to the custom matcher, it ought to be possible to change the
underlying representation
and still reuse most parts of the code. That's a future project.
Back to your project - what is the goal of the project?
Making something like GAP perhaps?
Do you want your users to supply ty
mproved for
smaller matrices by calling specialized routines written in Racket.
If you (or anyone else) are interested in improving `flomat` for multiplying
smaller matrices, I would be glad to receive patches.
Btw - you have some fancy tricks in `flalgebra.rkt` !
/Jens Axel
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erlying C/Fortran library that NumPy uses.
https://docs.racket-lang.org/manual-flomat/index.html
If you need rrays with more dimensions than 2 use `math/array`.
If you need simple computation of 1-dimensional data, you can use
standard Racket vectors (or flomats or arrays).
/Jens Axel
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hasn't been reflected in the build.
>
> Is there a problem with the server at the moment or am I simply being
> impatient?
>
Been there.
Is it possible to send a "your package has now been built" email, to those
authors
that recently clicked the "scan my packages&
ot;
(postpones) the
evaluation of its arguments. This can simply we be removed, if you don't
need it.
More details here:
https://github.com/soegaard/bracket/blob/master/bracket/bracket.rkt#L80
/Jens Axel
https://racket-stories.com
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Hi Éric,
This is a nice idea - I pondered the concept before, but today I got a
little further.
I am unsure whether the approach scales. You could look at nanopass too.
Anyways, here is a little experiment.
/Jens Axel
https://racket-stories.com
#lang racket
(require (for-syntax syntax/parse
d in lines 46-48:
[read-case-sensitive (lookup 'read-case-sensitive table)]
[read-decimal-as-inexact #f]
[read-accept-dot #f] /Jens Axel
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>
>> ; #>
>>
>> (The file in question begins with #lang racket.)
>>
>>
#lang racket
(define ns (make-base-namespace))
(define p (build-path "/Users/soegaard/tmp" "w1.rkt"))
(parameterize ([current-namespace ns])
(namespace-require p))
n entirely satisfactory
> solution because I may not always know what names f is providing.)
>
Sounds like a job for `namespace-require` with a require spec of the form
`(file ,(path->string (build-path f)))`.
/Jens Axel
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Den man. 20. jul. 2020 kl. 19.14 skrev Jens Axel Søgaard <
jensa...@soegaard.net>:
> Thanks for the response.
>
> I have attempted to go in your foot steps and have made a single file
> example, so it is easy to try out.
> Just to recap, the goal is to get the vertical bearin
x Harsányi has written many blog posts on how to use the Racket gui.
https://racket-stories.com/from/327
Other gui related blog posts:
https://racket-stories.com/from/248
Video in Racket guis:
https://www.youtube.com/watch?v=yo6wVXS6dkU
/Jens Axel
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If you are looking for examples of how to use the Racket GUI toolkit, I can
recommend:
https://github.com/mfelleisen/7GUI
It contains Racket implementations of the 7 gui tasks mentioned here:
https://eugenkiss.github.io/7guis/tasks
/Jens Axel
Den man. 6. jul. 2020 kl. 23.54 skrev Travis
interpreter page LiSP (Lisp in Small Pieces) where an
interpreter for fexprs is discussed
with full working code.
/Jens Axel
https://racket-stories.com
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code (which would either use an
> alist or an immutable hashtable).
I think `case` were more important before `match` arrived.
If you want to see how `case` can be implemented without hash-tables, look
at
William D Clinger's paper:
http://scheme2006.cs.uchicago.edu/07-clinger.pdf
/J
There may be other solutions, but one way to control the evaluation of
expressions entered in the REPL
is to provide an #%top-interaction, which sets the appropriate parameters.
/Jens Axel
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Slack users confirm the problem when the backing scale is 1.5.
Should DrRacket give a warning dialog on Linux, when started with a
non-integer backing scale?
/Jens Axel
Den ons. 13. maj 2020 kl. 05.48 skrev evdubs :
> I did some more digging and found locations in racket/draw that cont
d the symbol with two spaces to each side
instead of just one.
Can't remember where I picked that habit up.
/Jens Axel
https://racket-stories.com
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Den ons. 27. maj 2020 kl. 19.27 skrev George Neuner :
>
> On 5/27/2020 6:34 AM, Jens Axel Søgaard wrote:
> >
> > In standard Racket an application doesn't communicate how many values
> > a function is expected to produce.
>
> You can ask: see procedure-resu
ood idea. It is much easier to provide feedback based on
a concrete example.
/Jens Axel
Den tor. 21. maj 2020 kl. 18.36 skrev Guillaume Savaton <
guillaume.sava...@gmail.com>:
> I am a Racket beginner trying to create my own DSL.
> As a long-time user of Xtext and other similar too
Take a look at the `http` package.
https://docs.racket-lang.org/http/index.html
I believe it can be used to receive and send cookies (and other headers),
but
I don't know how much is automatic.
/Jens Axel
Racket Stories
https://racket-stories.com
Den søn. 17. maj 2020 kl. 17.51
-set.rkt#L46
/Jens Axel
Den søn. 10. maj 2020 kl. 10.51 skrev Laurent :
> Correction:
> It's not Mac vs Linux, it's Racket BC (works) vs CS (doesn't work)
>
> On Sun, May 10, 2020 at 9:49 AM Laurent wrote:
>
>> Hi all,
>>
>> We're trying
(check-equal? ?a ?b #'?a]
[(_assert ?a)
(quasisyntax/loc stx
(module+ test
(require rackunit)
#,(syntax/loc stx (check-true ?a #'?a]))
/Jens Axel
Racket Stories
https://racket-stories.com
Den tor. 7. maj 2020 kl. 11.22 skrev Dexter Lagan :
> Hi,
coped_q=regexp+type%3Aissue
>
> is better, but either way I'm quickly pretty lost in terms of deciding
> whether this relates to a known issue.
>
You need to look at docs.racket-lang.org instead. Then search for "regexp"
or "regular expression".
You will th
ode-left nod) (list (node-value nod)) (bst-sort
(node-right nod
is the problem. It can be reformatted to make it clearer:
(bst-sort (node-left nod)
(list (node-value nod))
(bst-sort (node-right nod))))
You are providing 3 arguments to bst-sort, bu
spatchers/dispatch-sequencer
(make dispatch-sequencer))
interface-version))
/Jens Axel
https://racket-stories.com
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you
will need write conversion functions.
/Jens Axel
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To view
fine (compare x y)
(if (and (real? x) (real? y))
(< x y)
(error 'compare "expected two real numbers, got: ~a ~a" x y)))
(vector-sort (vector 3 1 5 2) compare)
/Jens Axel
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"Rac
If he is using React for a new project, I suggest using React Hooks.
React Hooks were introduced in 2018 and "feels more functional" than their
previous approach.
https://reactjs.org/docs/hooks-intro.html
/Jens Axel
Den søn. 26. jan. 2020 kl. 18.12 skrev 'John Clements&#x
yet - it'll happen sometime tomorrow.
Philip: I'll keep your solution in mind, if I for some reason need to
change it.
/Jens Axel
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need to
figure out how best to handle sending mails
from a server. My concern is being flagged for spamming - so I don't dare
use my normal mail.
/Jens Axel
Den tir. 21. jan. 2020 kl. 22.43 skrev Stephen Foster <
step...@thoughtstem.com>:
> Ruby on Rails has a nice package called
groups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/racket-users/67dff8ff-cbd2-4d26-8901-34fc2be43928%40googlegroups.com
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Den tir. 26. nov. 2019 kl. 01.18 skrev E Comer :
> Hi Racket friends:
>
> The running of the following code produce an error under Windows, when I
> try to generate a PDF with the Scribble PDF button under DrRacket 7.5.
>
>
Which error?
/Jens Axel
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value))
(provide out))
(module a racket/base (require 'p) (displayln (list 'a (out))) (define
a 43) (provide a))
(require 'p)
(displayln (out))
(out "foo")
(dynamic-require ''a 'a)
The output is:
(a original-value)
original-value
this explains why Schemers write
(define magic (list 'magic))
and not
(define magic '(magic))
in order to obtain a unique value, not eq? to any other value.
In order to allowing implementations to share values in literals in R5RS it
is unspecified
what happens when you mutate a
e solution and upload it somewhere for you to have a
> look, but you'll need Visual Studio on Windows for that to work.
>
I don't have a windows machine - but your test example only have two files.
Is there a way to see
what options are applied (in a log perhaps)?
/Jens Axel
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Y
>
How do I compile the two test files?
In the reddit thread you said, I should start with:
raco ctool --c-mods base.c ++lib racket/base
But what are the options for gcc and the linker?
/Jens Axel
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Hi All,
As the Slack users already know, I have created a little web-site to share
interesting stories/links/blogs/packages/papers on everything
Racket-related.
https://racket-stories.com
Click "submit" to submit your own stories.
/Jens Axel
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comments than I usually
write:
https://github.com/soegaard/web-tutorial
The listit1-listit3 are the initial versions, which might become parts in a
tutorial at some point.
The almost-ready-to-release version is in version4.
The choices I made:
- the model uses structs to represent data (and
(syntax-parse #'(1 2 2 a 2 2 b 2 c)
[(1 (~seq n:nat ...+) x ...) #'(n ... x ...)])
(syntax-parse #'(1 2 2 a 2 2 b 2 c)
[(1 n:nat ...+ x ...) #'(n ... x ...)])
/Jens Axel
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a database, you could use a hash table to store the keys.
/Jens Axel
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e md5 of a counter) and keep track in a database
of which keys
have already been used.
To prevent the key table from getting too large, you can flip it around:
keep the non-used keys in the
database, then on submission remove the key. If you also store the age of
the key, you can
from time to
ket-users+unsubscr...@googlegroups.com.
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the foreign call. That means `_ptr` is fine.
>
Great.
Thanks,
Jens Axel
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ave used
(_ptr io _double)
but maybe I need to use a version of _ptr/immobile that also handles io
arguments?
If so how can I change the definition of _ptr/immobile.
See attached file for `crop/inked`.
/Jens Axel
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Check WeScheme.
https://www.wescheme.org/
(forgot to send to the list first time around)
/Jens Axel
Den man. 16. sep. 2019 kl. 12.26 skrev Maciek Godek :
> Hi,
> is there any way to deploy Racket's big-bang applications to run in a
> browser (or any plans to enable that feature)
Den tir. 10. sep. 2019 kl. 17.04 skrev Hendrik Boom :
> On Tue, Sep 10, 2019 at 03:23:43PM +0200, Jens Axel Søgaard wrote:
>
> > I have extended "clipped" to handle regions defined by more than one
> path.
> > Now (clipped c ... p) will make a region from the curv
))
(cutout p 200 200 50)
Before only one curve was supported and the result of clipped was the
interior,
so the old clipped couldn't cut holes.
/Jens Axel
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w h))
(circle x y r)
(set-curve-pict-size 400 400)
(def p (brushcolor "red" (fill (regular-polygon 5
(cutout p 200 200 50)
/Jens Axel
The result (the yellowish color is the background color in my editor):
[image: image.png]
Den man. 9. sep. 2019 kl
FWIW there a lot of (small) examples at
https://rosettacode.org/wiki/Category:Racket
/Jens Axel
Den man. 9. sep. 2019 kl. 16.09 skrev Prokop Hapala :
> Hi,
>
> I recently found Racket when I was searching some tutorials about Lisp and
> Metaprogramming. I really like that the comm
raint-solving
> language named miniKanren.
>
>
Apropos, Friedman and Byrd shows how one can use an
interpreter written in Kanren to generate Scheme programs.
https://www.youtube.com/watch?v=5vtC7WEN76w
/Jens Axel
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Is there a way to see that? Or have I got the wrong
> idea entirely?
>
Open your file in DrRacket. Click run. Now in the repl, evaluate doc.
/Jens Axel
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And if you are on macOS:
mbp:metapict soegaard$ export DYLD_PRINT_LIBRARIES=1
mbp:metapict soegaard$ export DYLD_PRINT_LIBRARIES_POST_LAUNCH=1
mbp:metapict soegaard$ export DYLD_PRINT_RPATHS=1
/Jens Axel
Den tir. 20. aug. 2019 kl. 18.49 skrev 'John Clements' via Racket Users <
does nothing but requiring the scribble file (which is a module
exporting doc-from-mod).
It's renamed on import (because we might need to include several documents).
Then it is simply inserted into the document at the place include-section
is used.
/Jens Axel
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Den tir. 30. jul. 2019 kl. 19.02 skrev Hendrik Boom :
> I've found this as an example for getting coloured text:
>
> #lang scribble/base
>
> @(require scribble/core)
>
> @(define (colorize #:color c . content)
> (elem #:style (style #f (list (color-property c)))
>
ul. 2019 kl. 23.36 skrev Kees-Jochem Wehrmeijer <
henc...@gmail.com>:
> Thanks very much! Will your talk also be available Matthew? After all the
> racket2 talks it sparked here, I'm kind of curious.
>
It's available here:
https://www.youtube.com/watch?v=dnz6y5U0tFs
/Je
and 50 are
reasonable.
(define (is-prime? n)
(case (mpz_probab_prime_p (mpz n) repetitions)
[(2) #t]
[(1) 'probably]
[(0) #f]))
(for/list ([n (in-range 2 100)]
#:when (is-prime? n))
n)
See https://docs.racket-lang.org/gmp/index.html?q=gmp and
https://gmplib.or
rity
(make-keyword-procedure make-disney-fish)
fish-arity
(remove '#:studio fish-required)
(remove '#:studio fish-allowed
Now we can write:
(disney-fish #:name "Nemo" #:color "orange")
The new disney-fish accepts only keywords accep
thin DrRacket would indeed be interesting.
Dobson made bindings for webkit at some point - but time flies by.
https://github.com/endobson/racket-webkit
I know of no newer packages.
/Jens Axel
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the current
(which are in d and a).
/Jens Axel
Den fre. 14. jun. 2019 kl. 16.45 skrev Sanjeev Sharma :
> within this for loop is there any way to access different pieces of the
> description and amt? car-ing and cdr-ing for example?
>
> Or move the identifier definitions into
because you are subscribed to the Google Groups
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rocess somewhat obscure.
> >
> > Sure, I could invent something. But chances are, someone else already
> > has invented something better than I'd improvise.
> >
> > -- hendrik
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Yes!
fre. 5. apr. 2019 kl. 13.52 skrev Hendrik Boom :
> On Fri, Apr 05, 2019 at 01:35:37PM +0200, Jens Axel Søgaard wrote:
> > Den tor. 4. apr. 2019 kl. 21.58 skrev zeRusski >:
> >
> > (define-simple-macro (define-foo (name:id formal:id ...) body:expr ...)
> >
bar op a b) (op a b))
will define foo_imp_1 and
(define-foo (bar op a b) (op a b))
will define foo_imp_2 respectively.
Simple models do not explain all situations, but it does handle simple
situations.
/Jens Axel
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ns:
>>
>> (plot (list (function sin -5 5) (function cos -5 5)))
>>
>> If others think that (1) and (2) are worthwhile doing, I will submit a
>> PR, so
>> we can discuss the API an implementation over something more concrete. I
>> am
>> open d
Den tir. 19. mar. 2019 kl. 23.03 skrev Alex Harsanyi :
> On Tuesday, March 19, 2019 at 9:53:23 PM UTC+8, Jens Axel Søgaard wrote:
>>
>> This is a great idea.
>>
>> It would be really nice to be able to use the colors also from non-plot
>> programs.
>>
>
FWIW see also the Mathematica documentation on ColorSchemes and related
functions for inspiration.
https://reference.wolfram.com/language/guide/ColorSchemes.html
/Jens Axel
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This is a great idea.
It would be really nice to be able to use the colors also from non-plot
programs.
/Jens Axel
Den tir. 19. mar. 2019 kl. 08.09 skrev Alex Harsanyi :
>
> The Python matplotlib package supports the concept of a colormap for
> selecting
> colors for each data
acket Users" group.
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ir per score.
>
> It was easy enough to solve with `for-each` using side-effects to update a
> mutable hash, however I think using a generator is a cleaner approach and
> doesn't require mutability.
>
FWIW here is a solution using immutable hashes. I see `for` and friends as
Rack
er-tools%2Flex..rkt%29._lexer%29%29
It's not at easy to use as standard #rx and #px expressions though.
/Jens Axel
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ct somewhere, you can just point me to
> the file(s).]
>
> George
>
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rove that (the timings are old - perhaps it has
become better already).
/Jens Axel
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ver), but more is better.
Given the recent discussion on the strengths of Racket, a tutorial on GUIs
would be nice.
Alex Harsanyi - are you persuadable?
Your blog is great: https://alex-hhh.github.io/tags/racket.html
/Jens Axel
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