#lang racket
(define (print-two f) (print (car f)) (print (cadr f)))
(print-two '(1 2)); prints 12
(define (print-all f) (for-each print f))
(print-all '(1 2)); prints 12
(print-all '(1 2 3 4)); prints 1234
Best wishes, Jos Koot
_
From: users [mailto:users-boun...@racket-lang.org
IIRC, Fortran (70 or 90, I don't remember) already recognized the problem.
In Racket notation and for simplicity ignoring the fact that a Fortran-loop
includes the finish and that the step may be negative:
(for ((f (in-range float-start float-finish float-step))) body)
was translated as
Void is a peculiar thing.
It is used by Racket where no result is ment.
But every expression must have a (multiple) value (if it computes in finite
time)
Because the value of (void) has to be considered to be the absence of a
value,
the repl and the interactions window do not show them. For
Matthias, you write:
all-true is the same as cannot-find-a-false-on-the-list.
Then I take an inverse:
all-false is the same as cannot-find-a-true-on-the-list.
But we have (in Racket):
(and) - #t
(or) - #f
Something is wrong with the inversion. But what?
Happy new year to all, Jos
The addition at least does it.
Thanks, Jos
_
From: Carl Eastlund [mailto:carl.eastl...@gmail.com]
Sent: 03 January 2015 20:17
To: Jos Koot
Cc: Matthias Felleisen; Frank Weytjens; users Users
Subject: Re: [racket] Little Schemer, lat?
Because all-true and all-false are both all
It does not in DrRacket but does in Racket (windows 7)
Jos
-Original Message-
From: users [mailto:users-boun...@racket-lang.org] On Behalf Of Jon Zeppieri
Sent: viernes, 07 de noviembre de 2014 19:10
To: Christian Wagenknecht
Cc: Racket Users
Subject: Re: [racket] beep
(display #\u0007)
I saw ans still see the same problem (Windows, Internet explorer)
Jos
-Original Message-
From: users [mailto:users-boun...@racket-lang.org] On Behalf Of J. Ian Johnson
Sent: viernes, 10 de octubre de 2014 15:19
To: Stephen De Gabrielle
Cc: Jay McCarthy; Racket Users
Subject: Re: [racket]
Do you mean
1:
Pascal showed you a calling convention that was new for you.
or
2:
Pascal showed you to have more than one calling convention.
?
I have used Pascal a lot in earlier days, but I am not aware of Pascal
providing more than one kind of calling convention.
Some decades ago I wrote my
See section 4.3.1 of the Racket guide.
Jos
_
From: users [mailto:users-boun...@racket-lang.org] On Behalf Of ? ??
Sent: domingo, 20 de julio de 2014 11:03
To: users@racket-lang.org
Subject: [racket] Pass by value/name/reference
Hey :)
How the arguments are passed in racket?
Be aware there is also a lazy racket (#lang lazy)
#lang racket ; call by value
(define (show x) (display x) (newline) x)
(define (plus x y z)
(display now we are in the procedure\n)
(+ x y z))
the procedure has been defined
(plus (show 1) (show 2) (show 3) )
the proceedure has been called
-Original Message-
From: Vincent St-Amour [mailto:stamo...@ccs.neu.edu]
Sent: domingo, 29 de junio de 2014 22:52
To: Eric Dobson
Cc: Jos Koot; Matthew Flatt; Jens Axel Søgaard; Racket Users List
Subject: Re: [racket] FW: q about code for partitions
Ah, that explains it. Thanks!
Vincent
-Original Message-
From: jensaxelsoega...@gmail.com
[mailto:jensaxelsoega...@gmail.com] On Behalf Of Jens Axel Søgaard
Sent: jueves, 17 de julio de 2014 13:12
To: Jos Koot
Cc: Vincent St-Amour; Eric Dobson; Matthew Flatt; Racket Users List
Subject: Re: [racket] FW: q about code
Strange: I do not get a segfault when running racket, only when running from
DrRacket.
Jos
-Original Message-
From: jensaxelsoega...@gmail.com
[mailto:jensaxelsoega...@gmail.com] On Behalf Of Jens Axel Søgaard
Sent: jueves, 17 de julio de 2014 13:12
To: Jos Koot
Cc: Vincent St
Version 6.0.1 shows the same problem, that is, no problem with racket, only
with DrRacket.
Jos
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: jueves, 17 de julio de 2014 13:48
To: Jos Koot
Cc: 'Jens Axel Søgaard'; 'Vincent St-Amour'; 'Eric Dobson
in version 6.0.1 there is a global cash that never shrinks and a
local one.
This I understand to run well in concurrent processes.
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: jueves, 17 de julio de 2014 18:02
To: Jos Koot
Cc: 'Jens Axel Søgaard'; 'Vincent St
I timed a version unrolling the loops for even and odd k. I see no speed up.
Just to let you know.
Jos
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: domingo, 29 de junio de 2014 8:47
To: Jens Axel Søgaard
Cc: Jos Koot; Racket Users List
Subject: Re
...@gmail.com] On Behalf Of Jens Axel Søgaard
Sent: domingo, 29 de junio de 2014 12:48
To: Matthew Flatt
Cc: Jos Koot; Racket Users List
Subject: Re: [racket] FW: q about code for partitions
I have made a new vector version using zero? instead of exact-zero?.
To give users a chance to remove
#lang racket
(define-syntax (set!-values* stx)
(syntax-case stx ()
((_ (var ...) values-expr)
(with-syntax (((local-var ...) (generate-temporaries #'(var ...
#'(let-values (((local-var ...) values-expr))
(set!* var local-var) ...)
(define-syntax (set!* stx)
(syntax-case
Sorry, forgot to post the following to the users list.
Hi,
count partitions, much faster and exact.
You may want to put the hash or part of it within function p such as to
avoid spllling much memory.
Jos
#lang racket
(require math/number-theory)
(define p-hash (make-hash '((0 . 1
(define
To: Jos Koot
Cc: Neil Toronto; Racket Users List
Subject: Re: [racket] FW: q about code for partitions
Hi,
I have converted your code to Typed Racket and made two versions.
The first version use a hash as cache and the second version
us a vector.
Timings show that the vector version is 1.5
-Original Message-
From: jensaxelsoega...@gmail.com
[mailto:jensaxelsoega...@gmail.com] On Behalf Of Jens Axel Søgaard
Sent: sábado, 28 de junio de 2014 16:51
To: Neil Toronto
Cc: Jos Koot; Racket Users List
Subject: Re: [racket] FW: q about code for partitions
The vector grows only once
-Original Message-
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: sábado, 21 de junio de 2014 0:51
To: Alexander D. Knauth
Cc: Jos Koot; users
Subject: Re: [racket] newlines in strings not the same in
DrRacket and Racket
The issue is probably that the file
I find the following:
(write (string-list #end
a
a
end
))
In DrRacket (#\a #\newline #\a)
In Racket: (#\a #return #\newline #\a #\return)
Jos
-Original Message-
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: sábado, 21 de junio de 2014 8:29
To: Jos Koot
Cc
Nonetheless many thanks for your help and attention.
Jos
-Original Message-
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: sábado, 21 de junio de 2014 9:54
To: Jos Koot
Cc: Alexander D. Knauth; users
Subject: Re: [racket] newlines in strings not the same
: sábado, 21 de junio de 2014 11:20
To: users@racket-lang.org
Subject: Re: [racket] newlines in strings not the same in
DrRacket and Racket
You are using Windows?
Am Samstag, 21. Juni 2014 schrieb Jos Koot:
I find the following:
(write (string-list #end
a
a
end
Running the following in DrRacket goes well.
#lang racket
(require test-engine/racket-tests)
(check-expect (format ~n)
)
(test)
(read-line) ; wait until the user has read the results.
Displays: The only test passed!
But running the same with Racket tells me the test fails.
I have a solution
de junio de 2014 22:41
To: Jos Koot
Cc: users
Subject: Re: [racket] newlines in strings not the same in DrRacket
and Racket
This doesn't exactly solve your problem, but what happens (for both
cases) when you do this?:
#lang racket
Message-
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: viernes, 20 de junio de 2014 23:03
To: 'Alexander D. Knauth'
Cc: 'users'; 'Jos Koot'
Subject: RE: [racket] newlines in strings not the same in
DrRacket and Racket
Gives me
(format ~n) = \n
= \n
The only test passed
I always use DrRacket for editing rkt files.
Thanks, Jos
From: Alexander D. Knauth [mailto:alexan...@knauth.org]
Sent: sábado, 21 de junio de 2014 0:20
To: Jos Koot
Cc: users
Subject: Re: [racket] newlines in strings
I always use write-style.
When I want another format, I use my own formatter (available on planet as
planet-fmt)
Best wishes, Jos
PS
_
From: users [mailto:users-boun...@racket-lang.org] On Behalf Of Laurent
Sent: martes, 17 de junio de 2014 17:12
To: Jason Hemann
Cc: users
Subject:
Hi
In share/pkgs/math-lib/math/private/number-theory I find the following two
pieces of code:
line 34: (define m (/ (+ 1.0 (flsqrt (+ 1.0 (* 24.0 n 6.0))
line 39: (exact-floor m)
Obviously for finding the positive root of the equation n-k(3k-1)/2=0 for k
in terms of n.
(from wikipedia:
I am very interested but not in the neighbourhood, otherwise I attend.
Looking forward to the recording.
Good luck, Jos
-Original Message-
From: users [mailto:users-boun...@racket-lang.org] On Behalf
Of Jay McCarthy
Sent: miércoles, 04 de junio de 2014 6:48
To: users
Subject:
On https://gist.github.com/joskoot
you can find function (partition n k)
which returns the k-th partition of n.
Racket Users list:
http://lists.racket-lang.org/users
Hi
Library *math/number-theory* provides procedure *partitions*,
which fastly tells you how many partitions a given nonnegative integer has
(based on http://en.wikipedia.org/wiki/Partition_(number_theory))
I have not found any procedure that generates the partitions themselves,
nor in PLT
Thanks for your advice.
Source is now on https://gist.github.com/joskoot/c80cee6fadce3434e941
Jos
_
From: Laurent [mailto:laurent.ors...@gmail.com]
Sent: martes, 06 de mayo de 2014 21:56
To: Jos Koot
Cc: Racket mailing list
Subject: Re: [racket] partitions
Why not making it a package
Hi Matthew
Yes, I have (define undefined (letrec ((x x)) x)) in some of my programs.
No, the backward incompatibility would not hurt me.
A few simple changes in my code would be sufficient,
I would not need the `racket/undefined` library.
I could replace (letrec ((x x)) x)) by
(let () (struct
Hi
The streams as provided by racket/stream are very nice and much simpler than
in srfi 41.
Racket Users list:
http://lists.racket-lang.org/users
Something went wrong with my previous email. Sorry. I try again.
Hi.
First of all congratulations with version 6.0. Very mice indeed.
The streams as provided by racket/stream are very nice and much simpler than
in srfi 41.
two remarks though.
one.
racket/stream duplicates code as found in
[mailto:carl.eastl...@gmail.com]
Sent: martes, 28 de enero de 2014 1:28
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket] FW: weakly held symbols?
This isn't a typo. The docs are talking about the properties of the symbol
tables for interned and unreadable symbols. There is no symbol table
]
Sent: martes, 28 de enero de 2014 1:28
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket] FW: weakly held symbols?
This isn't a typo. The docs are talking about the properties of the symbol
tables for interned and unreadable symbols. There is no symbol table for
uninterned symbols, so it wouldn't
Thanks.
I dont know why Racket wont release quoted literals after disappearing, but
your answer is clear.
Jos
_
From: Carl Eastlund [mailto:carl.eastl...@gmail.com]
Sent: martes, 28 de enero de 2014 18:13
To: Jos Koot
Cc: Racket Users
Subject: RE: [racket] FW: weakly held symbols
Hi to all,
Section 3.6 symbols of the Racket reference manual states:
Interned and unreadable symbols are only weakly held ... but a symbol maay
disappear when ... used as the key in a weak hash table ...
Racket Users list:
http://lists.racket-lang.org/users
It appears that my previous email was not sent completely. Sorry for that.
Here is the complete question.
Hi to all,
Section 3.6 symbols of the Racket reference manual states:
Interned and unreadable symbols are only weakly held ... but a symbol maay
disappear when ... used as the key in a
...@gmail.com]
Sent: domingo, 26 de mayo de 2013 20:38
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] Thought about namespaces
Try using make-empty-namespace instead of make-base-empty-namespace.
It won't work but will explain why the add1 procedures are the same
when you do get
de 2013 21:20
To: users@racket-lang.org
Subject: Re: [racket] Problem Stream with alternating values
On 19/05/2013 21:22, Jos Koot wrote:
Your function H1 is not lazy enough.
Closely following the instructions of the exercise I
immediately come with:
(define (dan-then-dog)
(cons
Your function H1 is not lazy enough.
Closely following the instructions of the exercise I immediately come with:
(define (dan-then-dog)
(cons dan.jpg
(lambda () ???)))
Can you fill in the question-marks?
Can easily be done with stream-cons too:
(define dan-then-dog-str (stream-cons dan.jpg
I came across another thing:
#lang racket
(define x #e100.e-5)
(rational? x) ; #t
(log x) ; -inf.0
(exact-inexact x); 0.0
(~r x #:notation 'exponential) ; error inexact-exact: no exact
representation
number: -inf.0
I think this is introduced in line 340 of racket/format.rkt which
Correct, my message has nothing to do with the initial problem.
Jos
-Original Message-
From: Dmitry Pavlov [mailto:dpav...@ipa.nw.ru]
Sent: miércoles, 08 de mayo de 2013 12:11
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] ~r: formatting 0.0 with 'exponential
: Ryan Culpepper [mailto:ry...@ccs.neu.edu]
Sent: miércoles, 08 de mayo de 2013 18:58
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] ~r: formatting 0.0 with 'exponential
and #:precision
Thanks for the report! I've taken your suggestion for ~r's
order-of-magnitude estimate. (I
[mailto:ry...@ccs.neu.edu]
Sent: miércoles, 08 de mayo de 2013 18:58
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] ~r: formatting 0.0 with 'exponential
and #:precision
Thanks for the report! I've taken your suggestion for ~r's
order-of-magnitude estimate. (I didn't change
+1
Jos
_
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Sean McBeth
Sent: lunes, 29 de abril de 2013 19:44
To: users
Subject: [racket] Thanks for being awesome
Dear Racketeers,
snip Or that it setup on all of my machines--Windows, Linux,
You already have the file, isn't it?
If you want to convert the string to a new file, open it with the
appropriate #:exists keyword argument and write.
If you want an input string, use open-input-string.
Jos
_
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On
Thanks Matthew,
I too did want such an option, but never thought it important enough to
complain about.
Jos
-Original Message-
From: users-boun...@racket-lang.org
[mailto:users-boun...@racket-lang.org] On Behalf Of Matthew Flatt
Sent: domingo, 21 de abril de 2013 17:59
To: Asumu
As in my other mail a minute ago, thank you Matthew.
Jos
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: domingo, 21 de abril de 2013 17:59
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] another scribble newbie question
I finally added
Would it be possible to use
http://en.wikipedia.org/wiki/Stirling%27s_approximation Stirling's
approximation for a fast inexact first approximation for factorials of very
big numbers and from there quickly get to an exact factorial? (if exactness
is required) I don't know for I haven't thought
] Math - factorial.rkt, binomial.rkt and
memoization
On 04/09/2013 11:41 AM, Hendrik Boom wrote:
On Tue, Apr 09, 2013 at 08:26:31PM +0200, Jos Koot wrote:
Would it be possible to use
http://en.wikipedia.org/wiki/Stirling%27s_approximation
Stirling's
approximation for a fast inexact first
Could be well Windiws 7. I have experienced the same type of problem and
solved it by removing the read-only vink in the properties of the whole
Racket directory. When installing a new nightly build I (sometimes?) have to
repeat that.
Jos
-Original Message-
From:
I'll be happy to help. I assume you are dealing with an exercise. Is this a
self-study or do you have a teacher? If you have a teacher he or she is the
best person to help you. Can you show me what you have so far? (if you like
off list) Without some more input from your part, it is difficult to
, Patrick Li wrote:
My personal experience is that a good and detailed
design is hard to
get to *without* doing the coding.
-Patrick
On Tue, Mar 19, 2013 at 1:50 PM, Jos Koot
jos.k...@gmail.com wrote:
One remark down intermixed in your email.
Jos
-Original
and
talk with future users before coding. If you wish you can interpret my
comment as a frustration that I felt like a profet in the desert.
Jos
_
From: Laurent [mailto:laurent.ors...@gmail.com]
Sent: martes, 19 de marzo de 2013 8:20
To: Jos Koot
Cc: Harry Spier; users
Subject: Re: [racket
on Programming
I forget where that quotation came from originally, but it
antedated the
days where internal documentation was the norm.
On Tue, Mar 19, 2013 at 06:20:57AM +0100, Jos Koot wrote:
Well, that may depend on how you define clever code.
Surely it is clever
to write well documented
Well, that may depend on how you define clever code. Surely it is clever
to write well documented code that can easily be understood, debugged,
maintained and reused by yourself and by others. Understanding may require
knowledge of the discipline the code is written for, of course. In my
opinion
Thanks for attention to my question. I tried your advice and some variations
on this theme, but without luck.
Jos
_
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: viernes, 01 de marzo de 2013 14:05
To: Jos Koot
Cc: Racket mailing list
Subject: Re: [racket] planet
directories are made as
well: compiled and planet-docs/examples. Is this expected and correct?
Forgive me my ignorance.
Thanks for the help,
Jos
_
From: Jos Koot [mailto:jos.k...@gmail.com]
Sent: viernes, 01 de marzo de 2013 19:15
To: 'Robby Findler'
Cc: 'Racket mailing list'
Subject: RE
Great, Thanks
Jos
_
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: viernes, 01 de marzo de 2013 20:30
To: Jos Koot
Cc: Racket mailing list
Subject: Re: [racket] planet question
Looking at the code, it appears that make-planet-archive is sensitive to the
current
.
Thanks to the whole PLT community for convincing me to scribble and helping
me with my newbie questions.
Jos
From: Robby Findler [mailto:ro...@eecs.northwestern.edu]
Sent: sábado, 02 de marzo de 2013 4:15
To: Jos Koot
Cc: Robby Findler; Racket mailing list
Subject
Hi all,
Working with DrRacket and Windows 7, I frequently see DrRacket being aborted
by Windows. This applies to previous versions of Racket too. At this moment
I use
version 5.3.3.3--2013-02-18(1c2432e/a) [3m].
Language: racket [custom]; memory limit: 2000 MB.
IIRC I have submitted a bug
I'll be happy to look into your code.
Send it me personally.
Jos
_
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Michael Situ
Sent: domingo, 24 de febrero de 2013 0:31
To: users@racket-lang.org
Subject: [racket] Visualization of Exercise 12.4.2
If the failure-result is a procedure, it is called without arguments. I
quote part of the doc:
quote
If failure-result is a procedure, it is called (through a tail call) with
no arguments to produce the result.
endquote
Jos
-Original Message-
From: users-boun...@racket-lang.org
Hi,
At last, with help of this list, I have a readable scribble/manual for my
planet-fmt, I think. In this manual I have:
#lang scribble/manual
blah blah blah
@defproc[(fmt
(format (or/c string? fmt?)) ...
(port (or/c output-port? 'string 'current 'argument) 'string))
Thanks Matthew, I'll try your advice.
Jos
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: viernes, 01 de febrero de 2013 22:38
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] confusing behaviour of managed-compile-zo
I think the issue
Cc: Jos Koot; users@racket-lang.org
Subject: Re: [racket] confusing behaviour of managed-compile-zo
There was a related problem that Sam noticed a while back about how the same
set of parameters (if not the same uses) leaked out into his program and the
best I came up with was the advice to disable
Hi Matthias,
That would be great.
Jos
-Original Message-
From: Matthias Felleisen [mailto:matth...@ccs.neu.edu]
Sent: jueves, 31 de enero de 2013 23:33
To: Jos Koot
Cc: 'Matthew Flatt'; 'Danny Yoo'; users@racket-lang.org
Subject: Re: [racket] scribbling newbie questions
We should
Inspired by http://www.infoq.com/presentations/Racket
http://www.infoq.com/presentations/Racket and now that DrRacket shows the
'Scribble HTML' button, I do my first serious attempt to scribble. With this
button I can easily see what I get. I use it very frequently. Marvelous! I
use
Thanks very much.
I'll try your suggestions. Your pointer provides a lot of useful
information.
Jos
-Original Message-
From: danny@gmail.com [mailto:danny@gmail.com] On Behalf Of Danny
Yoo
Sent: jueves, 31 de enero de 2013 20:36
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: jueves, 31 de enero de 2013 22:14
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] scribbling newbie questions
At Thu, 31 Jan 2013 18:40:06 +0100, Jos Koot wrote:
Q1
@racket[(string-length ((fmt I) #e1e10
When compiling with managed-compile-zo, manager-compile-notify-handler and
manager-trace-handler, I see that parts of the racket directory are
(re)compiled, for example:
TRACE: compiling: C:\Program Files
(x86)\Racket-Full-5.3.1.10\collects\racket\private\small-scheme.rkt
Thìs even happens
Assuming Jamel does a self study.
I think Jamel ment (/ (+ (* n n) 300) (* 13 n)).
Grant, with your definition:
(define (f n) ( + ( * n 2 ) 300))
(f 5) - 310
As Jamel is expecting 325, I assume n*2 is ment as an exponentiation.
There are many ways to write this down, for example:
(define (f
In some cases I want a namespace that includes more than racket/base only,
preferably a namespace that includes all of module racket. For example, a
base-namespace does not include procedure force (as clearly documented) I
see two methods to require all of racket into a base-namespace (I imagine
enero de 2013 23:29
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] requiring modules in a namespace
Method 1 is better, because it doesn't depend on `require' being bound
in the target namespace. For example, you can start with
`(make-empty-base-namespace)' instead of `(make-empty
I trust you, Matthias, as much as Kent Dybvig.
Happy new year to all, Jos.
-Original Message-
From: Matthias Felleisen [mailto:matth...@ccs.neu.edu]
Sent: jueves, 27 de diciembre de 2012 16:13
To: Jos Koot
Cc: 'Eli Barzilay'; 'J. Ian Johnson'; 'Dmitry Pavlov'; users@racket-lang.org
Some years ago I had a discussion with Eli Barzilay about a different
approach to letrec. The idea was to evaluate the expressions of the bindings
automatically in appropriate order. As an example:
(special-letrec
((a (+ b 2))
(b (* c 3))
(c 4))
(list a b c))
would be evaluated in the
Correct, I used promises and make-set!-transformer.
Jos
-Original Message-
From: Eli Barzilay [mailto:e...@barzilay.org]
Sent: jueves, 27 de diciembre de 2012 14:48
To: Jos Koot
Cc: Matthias Felleisen; J. Ian Johnson; Dmitry Pavlov; users@racket-lang.org
Subject: Re: [racket] internal
(directory-exists? C:\\Windows\\System32) - #t
(file-exists? C:\\Windows\\System32) - #f
You wrote: (Yes, Windows 8, please don't laugh at me. :-) )
I am laughing to myself, for I use windows 7 and windows XP :)
Jos
_
From: users-boun...@racket-lang.org
What you are asking for seems like alpha congruence, but less restrictive.
How much less restrictive? That depends on you definition of the same
pattern. In length you have (car l) and in length you have 1. Do they
have the same structure? That, of course depends on the definition of car
(it may
As 4.225 is inexact, it may be somewhat smaller that #e4.225 or somewhat
greater than #e4.225. Therefore, whether rounding an inexact number very
close to the edge of the rounding point goes up or down, seems irrelevant to
me. BTW, explicit rounding normally is the last operation in an inexact
Hi,
I wanted procedure -procedure-rename-, but forgot its name. I looked in page
-Inferred Value Names- in the help desk, but there no mention is made of
procedure -procedure-rename-. It took me some time to find the name of the
procedure I wanted. May be a mention of -procedure-rename- in
:
Jos Koot has a formatting library that deals with fp numbers. But I couldn't
find it on planet.
On Jul 27, 2012, at 2:27 PM, Ray Racine wrote:
Unable to locate a means to control the output formatting of
Real/Floats/what-have-you either via current formatting facilities (format
procedure etc
at 12:34 PM, Rodolfo Carvalho rhcarva...@gmail.com
wrote:
Hi,
I'm playing with lc-with-redex by Jos Koot, with example uses of Redex.
Racket Users list:
http://lists.racket-lang.org/users
the current procedure.
Thanks for your attention, Jos
-Original Message-
From: dmitry.pav...@gmail.com [mailto:dmitry.pav...@gmail.com] On Behalf Of
Dmitry Pavlov
Sent: sábado, 14 de enero de 2012 8:24
To: Jos Koot; r...@cs.utah.edu
Cc: users@racket-lang.org
Subject: Re: [racket] Formatted
You may want a look into
http://planet.racket-lang.org/display.ss?package=planet-fmt.pltowner=joskoo
t
Documentation as a doc file I'm afraid.
Jos
-Original Message-
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Dmitry Pavlov
Sent: jueves, 12 de
[mailto:mfl...@cs.utah.edu]
Sent: miércoles, 21 de diciembre de 2011 19:36
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re: [racket] cpu usage of DrRacket
We tracked this down to a Win64-specific problem with the recent JIT
switch from x87 to SSE for floating point --- now fixed.
Thanks for the report
Thank you for fixing the problem.
I am sorry I was not a great help.
I'll try the next nightly build.
Thanks again, Jos
-Original Message-
From: Matthew Flatt [mailto:mfl...@cs.utah.edu]
Sent: miércoles, 21 de diciembre de 2011 19:36
To: Jos Koot
Cc: users@racket-lang.org
Subject: Re
I see that after starting up, DrRacket constantly uses between 40 and 60 %
of my two CPUs, even with empty definitions window and before doing anything
by myself.
I use:
Welcome to DrRacket, version 5.2.0.6--2011-12-10(6fae172/a) [3m]
without debugging and without preserving stacktrace.
Language
If there is a less-than predicate for the elements of the list, the list can
be sorted and things may be speeded up, I think.
Jos
-Original Message-
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Eli Barzilay
Sent: lunes, 05 de diciembre de 2011
What would this library have to do/provide?
I may be interested in a contribution, if within my powers.
Jos
-Original Message-
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Matthias Felleisen
Sent: jueves, 17 de noviembre de 2011 12:58
To: José
: jueves, 17 de noviembre de 2011 16:11
To: Jos Koot
Cc: Racket Users
Subject: Re: [racket] Units/measures library
On Nov 17, 2011, at 8:41 AM, Jos Koot wrote:
That should not be too difficult. I think of:
Temperatures: Celcius, Fharenheit, Kelvin
Distance: Meters, kilometers, land miles
How can I import Racket's versions of define-syntax and syntax-case into
r5rs?
I tried the following:
#lang r5rs
(#%require (only racket define-syntax syntax-case))
(define-syntax (a stx) (syntax-case stx () (_ #'here)))
Gives error: macro-transformer: only a `syntax-rules' form is allowed in:
Another approach can be to represent numbers representing an amount of a
unit as a pair or a struct containing both the number and the unit. However,
this would require updates of a number of arithmetic operators. In addition,
read should accept numbers annotated with a unit. Writing them is less
If I recall correctly, long lines in the definitions window of DrRacket were
automatically split such as to be visible in even a small window. Nowadays I
see a scrollbar appear and lines are not shown split up. This is in
DrRacket, version 5.2.0.1--2011-11-07(7d607fd/a) [3m]. Is there an option to
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