Racket has nice features to implement languages.
This is very useful, for a programmer should allow his/her users to speak
or write in their own languages. I was aware of this already some 50 years
ago when writing systems for quantum mechanical calculations (NB using
fortran, not an easy tool to
At second thought I'll use syntax-local-name to infer names to structs
(in an immutable field and using prop:custom-write)
Does not give me the variable in which an instance originally was defined,
but that is less important .
Not being able to spot the original definition of an instance in case
ame "x", as opposed to the
> binding identifier, then see `syntax-local-name` or
> `syntax-local-infer-name`.
>
> If you want the binding identifier, though, that's not available.
>
> Matthew
>
> At Sat, 27 Feb 2021 20:52:23 +0100, Jos Koot wrote:
> > Hi
>
Hi
Consider:
(define-syntax (my-syntax stx) blah ...)
(define x (my-syntax blah ...)
Is it possible for syntax my-syntax such as to know (at expansion time)
that is used as the expr of variable x in the expression of the definition?
Probably this is possible by redefining syntax define, but can
Thanks to all who have responded to my email about my hobby circuit
simulator, all in a kind manner and instructive. Stephand de Gabrielle (to
whom many thanks too, of course) pointed me to section 3.3.4 of SICP, where
I learned how to deal with time by means of an agenda. After reading this
The following works well in DrRacket, version 7.8 [3m]
#lang scribble/manual
@deftogether[
(@defthing[#:kind "constant false/on/high" F trit? #:value '0]
@defthing[#:kind (list "constant true/off/low" (hspace 1)) T trit? #:value
'1]
@defthing[#:kind "constant indeterminate" ? trit? #:value '?]
file b.rkt
#lang racket
(require "a.rkt")
(err 5)
file a.rkt
#lang racket
(require "a.rkt")
(err 5)
Run file b.rkt from DrRacket.
Normal error message when debugging on file b.rkt is not enabled.
With debugging enabled:
-- #(struct:exn:fail:contract "vector-ref: contract violation\n expected:
Sending mail to racket -dev seems not to arrive correctly.Sending to other addresses does work.Therefore I try to report via racket-users.Jos
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The docs on make-set!-transformer do not mention that it also applies to
set!-values.
That is does apply to both is a good case, I think. I have tried to find the
documentation on the GitHub of racket but could not find it. Please give me a
hint where to look, so I can do a pull request for
Hi,
Your email is not an assault I think, but nevertheless I would like to add some
positive remarks on the community.
It is true that us...@racket-lang.org has changed in the last year or two
years, I think.
There are much less posts of users nowadays.
It is obvious that what you call the
In addition, some time ago I did use futures which did parallelization very
well when using distinct parts of the same vector. I did not need unsafe for
that.
Jos
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It’s long ago, but I worked nicely with parallelization on a CDC 205 both in
assembler and Fortran (CDC has expired shortly after). IIRC it did not protect
against simultaneous updating the same memory location. But what I do recall is
that it is very important that parallel processes use
Thanks to all of you for your help.
I have tried some of your suggestions.
They are promising.
Meanwhile I have found out that I can do the following:
- Create an equation in Word
- Save it as a picture
- Convert it to gif
- Insert it with @image
Nevertheless I’ll look further into your
.)
Thanks again, Jos
From: Stephen De Gabrielle
Sent: 16 June 2020 19:02
To: Jos Koot
Cc: us...@racket-lang.org
Subject: Re: [racket-users] scribble: how to put a bar above text?
Hi Jos
MathML support via the tag is not good.
I suspect the best option is to use Mathjax
https
Hi,
Using scribble when writing a text containing Boolean expressions it would be
nice to write ‘not(A+B)’ as ‘A+B’ with a bar above it. An expression like
not(not(A)+not(B)) would need bars above the A and the B as well above the
whole. Is this possible? I have found no solution in the
Well, thanks to both Ryan C and Ryan K.
Sorry for my confusion.
Best wishes, Jos Koot
From: Ryan Kramer
Sent: 14 June 2020 02:20
To: Racket Users
Subject: Re: [racket-users] Re: local variables arehyperlinkedinscribble/manual
That was actually Ryan Culpepper. Sorry for the noise, but I can't
default.kra...@gmail.com gave me a clear and usable answer.
His email follows below.
Best wishes, Jos
>From Ryan Kramer
You can also use make-element-id-transformer, like this:
(define-syntax SET
(make-element-id-transformer
(lambda _ #'(racketvarfont "set"
Then Scribble
Thank you Ryan and Ryan.
I think make-element-id-transformer is the easiest solution.
(let ([set #f]) (racket set)) is nice too because it can be used just where
needed.
I’ll try if that works around an interaction too.
An expression containing ‘set’ both as local and as imported variable
Hi,
I have:
#lang scribble/manual
@(require (for-label racket) scribble/eval)
@interaction[
(let ((set 1)) (add1 set))]
I prepare a HTML document with DrRacket (in Windows 10).
Works, but local variable set is hyperlinked to procedure set in the documents
(racket/set). I would like this
in Racket or in a Scheme like or Lisp like language).
Best wishes for all, Jos Koot
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)
(((id ...) (_ expr))
#'((id ...)
(:do-in
(((id ...) expr))
#t () #t () #t #f ()))
For example:
(for/first (((a b c) (in-values (values 2 + 3 (b a c)) ; -> 5
Thanks again, Jos
From: Philip McGrath
Sent: 04 May 2020 17:21
To: Jos Koot
Cc: us...@racket-lang.org
Subject: Re:
Very nice. I have installed the package. Thanks very much,
Jos
From: Philip McGrath
Sent: 04 May 2020 17:21
To: Jos Koot
Cc: us...@racket-lang.org
Subject: Re: [racket-users] multiple-value version of in-value
My package `adjutor` has a few variants of this, like `in-value*`:
https
Hi
File bug.rkt
#lang racket
(define (make-proc) (λ (x (y #f)) (void)))
(provide make-proc)
File bug.scrbl
#lang scribble/manual
@(require
scribble/core
scribble/eval
racket
"bug.rkt"
(for-label racket "bug.rkt")
(for-syntax racket))
@(defmodule "bug.rkt"
Perfect. (with-handlers ((exn:fail? exception-handler)) ...) works nice.
Thanks very much for your rapid response,
Jos
From: Ryan Culpepper
Sent: 27 June 2019 13:36
To: Jos Koot; Racket Users
Subject: Re: [racket-users] problem with current-error-port in
scribbleinteraction
The `uncaught
Hi,
The attachments are assumed to reside in the same directory and
are reduced forms of more elaborated code.
In module try-rkt I have code that captures errors such as
to avoid an error-message being written on the current-error-port,
to retrieve the error-message and to return normally.
This
, denk ik.
Ik test liever mijn computerprogrammas.
Ook de programmas die de testen uitvoeren moeten worden getest.
Daar krijg ik niet gauw genoeg van.
Veel liefs, Jos
From: meer.ba...@kpnmail.nl
Sent: 20 June 2019 20:43
To: Jos Koot
Subject: ojo
Dag Jos,
Zoals beloofd laat ik weten hoe het met mijn
Yes, the intermediate output-string does the job. Thanks.
Stupid me, not thinking of that by myself.
Jos
From: Robby Findler
Sent: 13 June 2019 21:32
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] exact rationals in interactions window
Does this help?
(let ([cp (current-print
Hi
Is it possible to instruct DrRacket to display non-integer exact rationals with
a slash in stead of a horizontal line?
If so, how? I tried current-print and the like, but without success.
Jos
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To whom may be interested,
Repository https://github.com/joskoot/nj-symbols
Provides procedures for the exact computation of the squares of 3j-, 6j- and
9j-symbols.
For documentation a scribble module is included.
Jos
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To whom is interested,
I have initiated a new repository:
https://github.com/joskoot/3j-symbol.
It contains a procedure for the exact computation of the signs
and the squares of 3j-symbols using the Racah formula.
Documentation is included as a scribble/manual module.
To do: add more tests.
I think the definition of write-point must come before the definition of
the struct type.
Jos
On Fri, 22 Feb 2019 at 23:35, Jack Firth wrote:
> Does it seem weird to anybody else that there's no way to set struct
> properties without mutual recursion?
>
> Say I'm defining a 2d point struct and
+1
On Thu, 7 Feb 2019 at 18:48, David Storrs wrote:
> For what it's worth, I like having the Guide and the Reference be
> separate things. They have different purposes and trying to mash them
> together is likely to make them worse at both.
>
> The Guide is designed to introduce new concepts,
Very nice.
Runs fast for my programs.
Thanks, to all who contributed, Jos
On Wed, 30 Jan 2019 at 19:59, Vincent St-Amour <
stamo...@eecs.northwestern.edu> wrote:
> Racket version 7.2 is now available from
>
> http://racket-lang.org/
>
> Racket-on-Chez is done in a useful sense, but we'll
You write:
> "It is often the case that
> arbitrary procedures don't compose meaningfully, whereas procedures that
> represent functions always compose meaningfully. "
>
> functions f and g can be composed meaningfully only if the domain of f is
> compatible with the co-domain of g.
Jos
--
Forgot to include the users group.
-Original Message-
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: 23 September 2018 21:37
To: 'Tomasz Rola'
Subject: RE: [racket-users] colon keywords
MHO, adhere to #:foo,
because :foo is a permitted identifier.
I prefer a clear distinction between
Ignore my email on this subject, please.
It is wrong.
Jos
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For more
Hi Craig Allen
Would something like the following work?
Jos
(define (make-sema n)
(define-syntax-rule (with-counter-sema expr ...)
(begin
(semaphore-wait counter-sema)
(define result (begin expr ...))
(semaphore-post counter-sema)
result))
(define counter-sema (make-semaphore 1))
Matthias,
Thanks, for the pointer.
I am studying the article, which at first look seems very well readable.
I did not mean to 'propose' my odd idea.
Jos
-Original Message-
From: Matthias Felleisen [mailto:matth...@felleisen.org]
Sent: 01 August 2018 16:26
To: Jos Koot
Cc: Racket Users
Very nice,
Jos Koot
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of Sanjeev Sharma
Sent: 23 March 2018 22:17
To: Racket Users
Subject: [racket-users] sharing an awesome plot - warms the cockles of my heart
I've done no math in 20 years - used
You forgot some parentheses:
(match user
[(hash-table ('name name) ('job (hash-table ('type type) ('id id ; <---
(displayln name)
(displayln type)
(displayln id)])
Jos
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of David
You are right, I think.
Thanks.
_
From: David Storrs [mailto:david.sto...@gmail.com]
Sent: martes, 27 de febrero de 2018 22:29
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] Understanding 'curry'
On Tue, Feb 27, 2018 at 2:46 PM, Jos Koot <jos.k...@gmail.com>
rom: David Storrs [mailto:david.sto...@gmail.com]
Sent: martes, 27 de febrero de 2018 20:13
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] Understanding 'curry'
On Tue, Feb 27, 2018 at 12:12 PM, Jos Koot <jos.k...@gmail.com> wrote:
curry itself is curried (which sometimes is
curry itself is curried (which sometimes is puzzling)
(define (foo a #:bar x) x)
((curry foo #:bar 9) 8) ; -> #
((curry curry foo #:bar 9) 8) ; -> 9
I hope others can explain this in detail.
I can't.
Jos
-Original Message-
From: racket-users@googlegroups.com
Hi
The order in which procedure make-custom-set-types returns its values
differs from the order given in the docs.
The same holds for procedure make-custom-hash-types.
Can this be synchronized?
(preferably in the docs for backward compatibilty, I assume)
DrRacket, version 6.12 [3m].
Jos Koot
(eq? +nan.0 -nan.0) -> #t
This is documented:
The datum -nan.0 refers to the same constant as +nan.0, and -nan.f is the same
as +nan.f.
Jos
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of David Storrs
Sent: martes, 06 de febrero de 2018 00:42
Hi,
1:
In module racket/collects/list.rkt
the definition of procedure in-permutations
contains the line:
(define cur (reverse l))
Why the reversal?
Why not:
(define cur l)?
With (define cur l) in-permutations returns the permutations
in the same order as procedure permutations,
starting with
+1
On windows it is the same.
It would be nice to have the option to revert defaults for the current tab only.
Jos
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of JCG
Sent: viernes, 12 de enero de 2018 01:38
To: Racket Users
Subject:
comment #,my-comment)
(in-permutations '(1 2 3)))
(a)]
Thanks, Jos
_
From: Ben Greenman [mailto:benjaminlgreen...@gmail.com]
Sent: lunes, 27 de noviembre de 2017 6:44
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] misterious empty line
My guess is that "(define" does so
My code:
#lang scribble/manual
@(require
scribble/core
scribble/eval
racket
(for-label racket)
(for-syntax racket))
@elemtag["rearrangement" "Not important."]
@interaction[
(require racket)
(code:comment #,(list "Procedure " (racket in-permutations)
" produces a sequence of "
I have downloaded and installed "Welcome to DrRacket, version
6.11.0.2--2017-11-12(b54ea8c5b1/a) [3m].",
but the problem still remains.
I have Windows 7 premium home.
Thanks, Jos
_
From: Jens Axel Søgaard [mailto:jensa...@soegaard.net]
Sent: zondag 12 november 2017 21:21
To
Hi
In the definitions window of DrRacket:
#lang racket
(require (only-in math/number-theory partitions))
(partitions 0)
(partitions 0)
Runs ok,
but after running,
typing (partitions 0) in the interactions window
gives the following error:
define-values: assignment disallowed;
cannot re-define
I have put my code at: https://github.com/joskoot/partitions
Best wishes, Jos
-Original Message-
From: Iain Gray [mailto:iaing...@ednet.co.uk]
Sent: jueves, 09 de noviembre de 2017 17:30
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] numerical partitions
my use
How did you implement procedure part many years ago?
Things may depend on what you want to do with the partitions.
Do you want the whole list at once,
or would a stream or generator be more appropriate?
If you want I can send you a stream-version,
but it is in a bad style.
It has docs made with
))
(plus4 0)
]
Conclusion.
Thanks again for your help.
Jos Koot
_
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: domingo, 24 de septiembre de 2017 13:01
To: 'Ben Greenman'
Cc: 'Racket Users'; 'Jos Koot'
Subject: RE: [racket-users] repeated code in interactions of scribble
Th
]
Sent: domingo, 24 de septiembre de 2017 6:45
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] repeated code in interactions of scribble
You can re-use helper functions by running the different example blocks with
the same evaluator (example below).
I don't know how to hyperlink one
Hi,
What would be the easiest way to avoid duplication of code in interactions
within a scribble/manual document?
I often place examples in such a document.
In some of them I need the same auxiliary procedures.
How to avoid duplicating them?
The most nice solution would be the appearance of a
How about:
(define-syntax (macro stx)
(syntax-case stx ()
[(_ (var1 ...) (var2 ...))
#`(begin
#,@(for*/list ((v1 (in-list (syntax->list #'(var1 ...
(v2 (in-list (syntax->list #'(var2 ...)
#`(do-something #,v1 #,v2)))]))
Jos
Thanks!
Jos
-Original Message-
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: lunes, 28 de agosto de 2017 1:21
To: Jos Koot
Cc: hashim muqtadir; Racket Users
Subject: Re: FW: [racket-users] Can't seem to find the blue box(es) in DrRacket
anymore
I've pushed a fix
Sorry, ignore my post.
Jos Koot
-Original Message-
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: domingo, 27 de agosto de 2017 19:00
To: 'hashim muqtadir'; 'Racket Users'
Subject: RE: [racket-users] Can't seem to find the blue box(es) in DrRacket
anymore
I think you can toggle
I think you can toggle a switch in tab 'background expansion' of the
preferences menu.
Jos
-Original Message-
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of hashim muqtadir
Sent: domingo, 27 de agosto de 2017 8:12
To: Racket Users
Subject:
remember or/and want to start again.
I think I can contribute with short talks and conversations.
Jos Koot
-Original Message-
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of luis.osa.gdc
Sent: jueves, 24 de agosto de 2017 14:19
To: Racket Users
Cc
Surely this is homework.
I am not giving you all detauils, just some hints.
First of all: Look in HtDP.
Your translator works for single words.
Let translate-sentence be the procedure for translating a list of words.
Following HtDP it can look like:
(define (translate-sentence sentence lexicon
Hi Damien
Right, interesting only for the theory.
But also a lot of fun to play with.
Did you see my example of a TM for binary addition of two arbitrary large
numbers?
It has 13 states (of which only 9 are essential)
and 51 rules (of which only 27 are essential)
The test includes 50 tests with
To whom is interested.
Jay McCarthy has a nice page about how to program Turing machines:
http://jeapostrophe.github.io/2013-10-29-tmadd-post.html.
Because I did not immediately see his implementation of producing a Turing
machine as a Racket procedure,
I made one myself :
as a thanks to PLT to be so useful for me for many years.
This is a promise to try, not one to succeed.
Jos
-Original Message-
From: Matthias Felleisen [mailto:matth...@ccs.neu.edu]
Sent: domingo, 30 de abril de 2017 0:39
To: Jos Koot
Cc: Neil Van Dyke; Racket Users
Subject: Re: [racket-users
Message-
From: Neil Van Dyke [mailto:n...@neilvandyke.org]
Sent: sábado, 29 de abril de 2017 23:25
To: Jos Koot; 'Racket Users'
Subject: student project idea: semi-WYSIWYG Scribble editor (Was: Racket 6.9)
If some undergrad wanted a summer programming project... make a
semi-WYSIWYG editor
: [racket-users] Re: Racket 6.9
On Sat, 29 Apr 2017 21:05:10 +0200, "Jos Koot"
<jos.k...@gmail.com> wrote:
>I have downloaded 6.9, but was warned that the file does not end
>in correct way. Running the exe anyway gave a DrRacket that aborts
>after opening it. I have
[mailto:n...@neilvandyke.org]
Sent: sábado, 29 de abril de 2017 22:29
To: Jos Koot; Racket Users
Subject: Re: [racket-users] Racket 6.9
Stephen De Gabrielle wrote on 04/29/2017 03:18 PM:
> Ubuntu Linux is cheap, includes an alternative to ms word, gets
> regular updates and (most impor
Thanks for clarifying.
Jos
_
From: Stephen De Gabrielle [mailto:spdegabrie...@gmail.com]
Sent: sábado, 29 de abril de 2017 21:57
To: Jos Koot; Racket Users
Subject: Re: [racket-users] scale of image of scribble with .jpg
Scaling will always make the image less sharp, but you are right
...@gmail.com]
Sent: sábado, 29 de abril de 2017 21:33
To: Jos Koot; Racket Users
Subject: Re: [racket-users] Racket 6.9
I just realised I have a Windows 7 (32bit) toshiba nb 200.
DrRacket (32bit) launched with no problems.
Check the operating system type(32-bit/x86 or 64-bit x64) is the same
Hi,
I have the following:
#lang scribble/manual
...
@(image #:scale 2 "Turing-machine.jpg")
...
Works well, except that the image is not enlarged.
What should I do to force the scale?
Scaling does work with .gif,
but .gif gives less sharp images.
Thanks, Jos
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You received this message
similar to the grammar can improve
the layout of the rendering of a defform.
Just a thought,
Jos Koot
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Option 3 works very fine.
I have incorporated it in https://github.com/joskoot/turing.
Looks very good.
Thanks again, Jos
-Original Message-
From: Dupéron Georges [mailto:jahvascriptman...@gmail.com]
Sent: martes, 28 de marzo de 2017 15:13
To: Racket Users
Cc: jos.k...@gmail.com
Subject:
Thanks very much indeed for your comprehensive answer.
I tried your code given for option 3.
Works well, but your warning makes me hesitate.
Well, I'll see.
I already have a lot of old code no longer accepted by Racket.
Not a big problem, but requires work to adapt.
Thanks a lot again,
Jos Koot
When I use #:grammar in a defform,
the rules of the grammer are separated by empty lines.
I would like to avoid these empty lines.
Is it possible?
The contracts of #:contracts do not have empty lines between them.
I ask this question because I have a rather long grammar that
would fit in one page
Hi,
First: thanks for version 6.8.
I have the following:
#lang scribble/manual
@(require
scribble/core
scribble/eval
racket
scribble/html-properties
(for-label racket)
(for-syntax racket))
@interaction[
(let ()
(code:comment #,(list "a" "b"))
(code:comment #,(list "a" "b"))
Hi,
Consider:
#lang scribble/manual
@(require
scribble/core
scribble/eval)
@interaction[
(printf "a~n~nb")]
Shows one newline only.
It produces:
| > (printf "a~n~nb")
| a
| b
It is not a big problem.
I can write:
@interaction[
(printf "a~n ~nb")]
which produces:
| > (printf
Doesn't (struct ... #:guard guard-proc ...) not do what you want?
See the doc on struct.
Jos
-Original Message-
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of Eric Eide
Sent: jueves, 29 de diciembre de 2016 2:55
To: Racket Users
Subject:
->number.
On 12/21/2016 11:33 PM, Jos Koot wrote:
>
> Or up to 60, 60 even nowadays being a commonly used radix in time notation.
FWIW, the radix of the time notation does not seem that simple to me.
I would rather say it is a combined notation.
base-10 (days), base-60 (up to 24 hour
Or up to 60, 60 even nowadays being a commonly used radix in time notation.
Why restricting it to 36?
Jos
-Original Message-
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of Dmitry Igrishin
Sent: miércoles, 21 de diciembre de 2016 20:41
To: Racket
Koot
Cc: steve.lett777; Racket Users
Subject: Re: [racket-users] Newbie seeking advice
> On Dec 20, 2016, at 1:53 PM, Jos Koot <jos.k...@gmail.com> wrote:
>
> Hi,
>
> You already had some very good replies.
> If you are very new to programming, I second the advic
Hi,
You already had some very good replies.
If you are very new to programming, I second the advice
to start with Racket and to look into The Little Schemer
(in older days The Little Lisper)
In addition, this mailing list is very friendly
and can help you with problems you will encounter on your
Hi
After downloading DrRacket, version 6.7.0.3--2016-12-11(db8d8f8/a) [3m]
starting DrRacket shows a rotating lambda.
IMHO the previous logo has more style and better shows the remaining time
needed to load DrRacket.
Not an important issue, of course. A matter of taste probably.
Please let's not
Thank you very much.
I don't understand why I missed that part of the docs.
Jos
-Original Message-
From: stchang...@gmail.com [mailto:stchang...@gmail.com] On Behalf Of Stephen
Chang
Sent: miércoles, 30 de noviembre de 2016 19:56
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] hyperlink in code:comment
You can use the escape identifier:
#lang scribble/manual
@(require scribble/eval
(for-label racket))
@interaction[
(define a (list 1))
(define b (list 1))
(code:comment @#,para{a and b are not @racket
Go to menu item: edit, preferences, background-expansion
and enable it.
Sometimes it is necessary to close and reopen DrRacket to get the choices
active.
Jos
-Original Message-
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of SR
Sent: sábado, 26
Thanks for the clear answer.
I'll try raco pkg install ...,
but command line stuff is troublesome on windows.
But I'll try.
Jos
_
From: Matthew Butterick [mailto:m...@mbtype.com]
Sent: viernes, 25 de noviembre de 2016 23:03
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] css
Hi,
Every time I click Scribble HTML in DrRacket
for a scribble/manual module in a separate directory
I find that a number of css files and two js files are produced in the same
directory (Windows 7)
Are these files always the same?
If so can't we put them in Appdata.Roaming, in order to avoid
Your quastion is not clear to me but may be you want --thunk*--?
Jos
_
From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
Behalf Of David Storrs
Sent: sábado, 12 de noviembre de 2016 22:23
To: Racket Users
Subject: [racket-users] If a thunk is a proc of zero
Hi
Lisp (and Racket) programmers know the value, Fortran (and assembler)
programmers the cost.
Nowadays the PLTeam is working on effeciency too, I think.
But: the most important factor for efficient programming is to select efficient
algorithms.
Two very simple, but notorious examples where you
]
Sent: jueves, 27 de octubre de 2016 16:46
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] scribble/eval interaction hyperlinks locally bound
variables
> On Oct 27, 2016, at 5:34 AM, Jos Koot <jos.k...@gmail.com> wrote:
>
> Consider:
> #lang scribble/manual
>
Consider:
#lang scribble/manual
@(require (for-label racket) scribble/eval))
@interaction[(let ((add1 sub1)) (add1 1))]
In the produced HTML file the locally bound variable 'add1'
is linked (in blue) to the docs of Racket's procedure 'add1'.
The same problem with @racket[...]
I can avoid this
[mailto:benjaminlgreen...@gmail.com]
Sent: domingo, 02 de octubre de 2016 21:34
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] optional hyphen in scibble
Maybe:
https://pkgn.racket-lang.org/package/hyphenate
On Sun, Oct 2, 2016 at 3:30 PM, Jos Koot <jos.k...@gmail.com> wrote:
Hi
Hi to all of this nice list,
IIRC I have seen a tool to put optional hyphens in running text in order to
allow scribble to break words at the end of a line.
However, I no longer can't find it (I know, I am a bad browser)
A pointer to the related docs will be appreciated very much.
Thanks,
Jos
_
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: lunes, 12 de septiembre de 2016 4:07
To: 'Vasily Rybakov'; 'Racket Users'
Cc: 'Jos Koot'
Subject: RE: [racket-users] Trouble with recursive lambda macros, using Y
combinator
When using a macro, always think: "can I do the same wi
When using a macro, always think: "can I do the same without a macro?"
You use the simple auto-applicator (lambda (x) (x x)).
I suggest to use an applicative-order Y-combinator, such as:
(define Y (λ (m) ((λ (f) (f f)) (λ (g) (m (λ (n) ((g g) n)))
Now: ((Y (lambda (!) (lambda (n) (if (zero? n)
]
Sent: viernes, 09 de septiembre de 2016 22:21
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket-users] typed racket confusion
Because in function `b`, the type of the `lambda` that `n` actually be passed
to is the union of `add1` and `sub1` in the context,
hence, the info on parity of `n
#lang typed/racket
(define (a (n : Exact-Nonnegative-Integer)) : Exact-Nonnegative-Integer
(if (even? n) (add1 n) (sub1 n)))
(define (b (n : Exact-Nonnegative-Integer)) : Exact-Nonnegative-Integer
((if (even? n) add1 sub1) n))
Function a goes well,
but function b gives an error during
Would this do what you want?
#lang scribble/base
@section{a}
@subsubsub*section{a}
@subsubsub*section{a}
@subsubsub*section{a}
@section{b}
@seclink["a" "section a"]
@subsubsub*section{b}
@subsubsub*section{b}
@subsubsub*section{b}
@section{b}
@subsubsub*section{b}
@subsubsub*section{b}
I love it too, but I think he author(s) want much more than teach a language.
They want to teach designing programs (in arbitrary
language I think). They have chosen student languages (subsets of racket) to
talk about design.
To Matthias: I love the book very much as said above. Nevertheless
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