Hello,
I am developing a custom non-sexp language in Racket.
Here is how I provide my own syntax colorer for it
in module mylang/lang/reader.rkt:
#:info (lambda (key defval default)
(case key
[(color-lexer)
(dynamic-require 'mylang/tool/syntax-color
Hello,
I am having trouble debugging Racket code that contains macros.
Here is the simplest example:
#lang racket
(define-syntax-rule (my-print x)
(printf "~a\n" x))
(define-syntax-rule (my-print1 x)
(begin
(printf "~a\n" x)))
(my-print 10)
(my-print1 20)
(my-print 30)
(my-print1 40
(let) solves the
problem with source location of the macro and also preserves
the source location info of the inner S-expressions of the macro.
I still use Racket 5.1.3.
Best regards,
Dmitry
On 11/14/2011 12:24 PM, Dmitry Pavlov wrote:
>
> Hello,
>
> I am having trouble debugging
Hello,
I would like to make read-byte and friends to
throw an exception in case end of file is
reached. That is, when I call read-byte,
I know that the byte must be there, otherwise
the input data is corrupt. I would prefer
not to check the result of every read-byte
call. What is the simplest way
ose?))
(define p (open-input-bytes #"apple"))
(define p2 (input-port->error-eof-input-port p))
(read-bytes 5 p2) ; ok
(read-byte p2) ; fail
At Mon, 26 Dec 2011 08:06:47 -0800, John Clements wrote:
On Dec 26, 2011, at 2:46 AM, Dmitry Pavlov wrote:
Hello,
I would like to ma
Hello all,
I have been looking for a way to do in Racket
something you can easily do in C:
printf("%10.5lf\n", 12.345678);
so it properly cuts the fractional part to 5 digits
and adds padding to get 10 characters in total,
producing " 12.34568" as a result.
Best regards,
Dmitry
_
Hello Grant,
> http://synthcode.com/scheme/fmt
>
> There is a Planet package for it right on the page.
Thanks, it seems to be just what I need.
After reading the docs, I think that
(fmt #f (pad 10 (fix 5 12.345678)))
will do the job for me.
However, I can not load the package:
> (require (plane
Jos, Ryan,
Thanks for your suggestions. They both work --
for planet-fmt the code is ((fmt "F10.5") 12.345678).
I think I will take srfi/48, as it does not require
connecting to PLaneT.
Best regards,
Dmitry
Racket Users list:
http://lists.racket-lang.org/users
Hello all,
I am having trouble with yacc parser giving shift/reduce
conflict, while I do not see where the conflict can be.
I have simplified the grammar to the following one:
#lang racket
(require parser-tools/yacc
parser-tools/lex)
(define-empty-tokens my-tokens (EOF A B C))
(defi
parser.
I should have educated myself on the subject earlier:
http://www.cs.man.ac.uk/~pjj/cs212/ho/node7.html
So to make that conflict gone, I had to convert my
grammar to something like
(x
((C A B) 'cab))
((C A A B) 'caab)))
Best regards,
Dmitry
On Mon, Jan 16, 2012 at 2:49
Hello Simon,
Some observations that maybe will help:
1. Since the problem is obviously in the lexer,
you would probably prefer testing the lexer instead
of parser:
(define (test-lexer str)
(let ((p (open-input-string str)))
(port-count-lines! p)
(let loop ()
(let ((tok (position
Hello,
I recently tried to submit a bug report about srfi/48.
The system tells me every time that it will send me
an e-mail soon, and I have not received any. I tried
to search my bug on the site, and found nothing, so
I think it rejected my report for some reason. I tried
yesterday and today, fr
Hello,
I once implemented a DSL called "slon" in Racket.
My programs start with "#lang slon", and I open
them in DrRacket, edit, run, and debug them.
To make Racket aware of the DSL, I can either put a symbolic
link to my code into the standard collects directory:
ln -s /home/dpavlov/work/slon
et the collection path and then
> started up a DrRacket inside that DrRacket, you'd see the buttons as
> you expect.
>
> But in any case, I think raco link is probably the best approach.
>
> Robby
>
> On Thu, Mar 1, 2012 at 2:22 AM, Dmitry Pavlov wrote:
>> Hello,
&g
Hello,
I was wondering if Racket's struct instances can be initialized
with keywords, like in the following example written in CL:
* (defstruct foo bar baz)
FOO
* (make-foo :bar 1 :baz 2)
#S(FOO :BAR 1 :BAZ 2)
Best regards,
Dmitry
Racket Users list:
http://lists.racke
03392.html (See
Matthias' response)
I recall this example quite well, as it was very helpful when I was learning
Racket macros.
On 2012-03-05, at 8:16 AM, Dmitry Pavlov wrote:
Hello,
I was wondering if Racket's struct instances can be initialized
with keywords, like in the followin
Neil,
I kept in mind to initiate a topic about it, but
since you asked first (thanks!), I will say it now:
*** I want 80 bit IEEE floating point numbers in Racket. ***
Double precision (64 bit) is not always enough for scientific
calculations. Extended precision is demanded.
Is it possible to
Hello,
The topic of unloading a library loaded with ffi-lib
was raised in 2010:
http://lists.racket-lang.org/users/archive/2010-August/041023.html
The answer was that Racket can not unload a library.
Has there been any update since then?
Best regards,
Dmitry
Racket Users
>> http://lists.racket-lang.org/users/archive/2010-August/041023.html
>>
>> The answer was that Racket can not unload a library.
>> Has there been any update since then?
>
> No, there's still no support for unloading.
It would be nice to have at least REloading,
at least "for debugging purposes on
Hello,
I am stuck with a Racket<->C linkage problem which manifests
itself at random occasions.
I was able to come up with this short example (ffi-test.rkt)
with which the problem can be analyzed:
#lang racket
(require ffi/unsafe ffi/unsafe/define ffi/unsafe/cvector ffi/vector)
(define libmy
Matthew,
(define _handler (_fun _int _pointer -> _int))
The `_pointer' C type means a reference to memory that is not managed
by the GC. Change the `_pointer' above to `_gcpointer', since the
handler receives a pointer that is managed by the GC.
That makes perfect sense! Thank you very much
The problem in this case is that the C code receives a pointer `x' to a
GC-managed object, and the object at that memory moves during the
callback to filler(), so that memcpy(x, ) copies to the wrong
place.
Ahhh, I should have figured that. Thanks!
Assuming that your C code will remain o
Hello,
I just came across a strange error:
#lang racket
;(require (for-syntax (only-in ffi/unsafe ctype-sizeof _pointer)))
(require-for-syntax (only-in ffi/unsafe ctype-sizeof _pointer))
(define-for-syntax (os-bitness)
(let ((ptrsize (ctype-sizeof _pointer)))
(case ptrsize
((4) 32)
Danny,
Is require-for-syntax even a form in #lang racket? I thought it doesn't
exist outside the mzscheme legacy language, at least according to
http://docs.racket-lang.org/mzscheme/Old_Syntactic_Forms.html#(form._((lib._mzscheme/main..rkt)._require-for-syntax))
I agree with you. It is strang
Hello,
Using the latest Racket snapshot, I am getting a cryptic
error message in raco exe.
test.slon is a program written in a custom #lang.
$ racket -v
Welcome to Racket v6.1.1.8.
$ raco make test.slon
$ racket test.slon
OK
$ raco exe test.slon
require: unknown module
module name: #"/opt/rack
rted with a recent change
in TR to avoid loading contracts when typed code isn't used in untyped
contracts, refining that implementation exposed a problem with `raco
exe`, etc.
Thanks for the report!
At Fri, 27 Feb 2015 15:39:14 +0300, Dmitry Pavlov wrote:
Hello,
Using the latest Racket snapsh
On 03/03/2015 01:59 AM, Alexander D. Knauth wrote:
Could submodules be causing it?
try.rkt:
#lang typed/racket/base
(provide x)
(define x : Integer 1)
(module* test racket/base
(require (submod ".."))
x)
Gives this error:
. . Racket v6.1.1.8/collects/racket/private/reqprov.rkt:79:13:
syn
Hello,
I try to require the plotting library (let alone use it) in
a non-X Linux session:
$ ssh localhost
$ racket
Welcome to Racket v6.1.1.8.
> (require plot)
Gtk initialization failed for display ":0"
context...:
/opt/racket/share/pkgs/gui-lib/mred/private/wx/gtk/queue.rkt:
[running body
Leif,
You can always use the plot/no-gui collection:
http://docs.racket-lang.org/plot/plotting.html?q=plot%2Fno-gui#%28mod-path._plot%2Fno-gui%29
This should work without the need for X11.
Thank you, that is exactly what I need.
Best regards,
Dmitry
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You received this message because y
Hello,
I just started to experiment with making my Racket library embeddable to
C programs [1]. The first thing I needed to do was to download
the Racket source code and compile the libracket3m.a. I wonder why the
maintainers do not put this file into the distribution? It seems that
as soon as
se `execve()` works better for our
purposes.
At Tue, 15 Sep 2015 14:29:51 +0300, Dmitry Pavlov wrote:
Hello,
I just started to experiment with making my Racket library embeddable to
C programs [1]. The first thing I needed to do was to download
the Racket source code and compile the libracket3m.a. I
Hello,
I just created a C program that uses my Racket library via
Racket's embedding mechanism, and it works fantastic.
Now I am wondering---how to ship my C program's
executable if the underlying Racket library has runtime
paths in it? The executable seems to have been set up for
absolute paths
y
At Wed, 16 Sep 2015 14:26:41 +0300, Dmitry Pavlov wrote:
Hello,
I just created a C program that uses my Racket library via
Racket's embedding mechanism, and it works fantastic.
Now I am wondering---how to ship my C program's
executable if the underlying Racket library has runtime
pa
Also, if it matters, I usually make my Windows builds on Linux
with MinGW (i686-w64-mingw32-gcc, x86_64-w64-mingw32). But I can
use Visual Studio too, I guess, if that will make things easier
for raco distribute or whatever.
Best regards,
Dmitry
On 09/16/2015 03:52 PM, Dmitry Pavlov wrote
Matthew,
I've added a `--runtime ` argument to `raco ctool --cmods`, which
gathers runtime files into and makes the embedded modules refer
to them in (which is expected to be relative to the executable,
but see also the `--runtime-access` option).
The embedding executable must call scheme_se
,
Dmitry
On 09/15/2015 11:01 PM, Dmitry Pavlov wrote:
Matthew,
Sure I meant the full distribution.
Thanks, I hope that the consensus will be reached :)
Best regards,
Dmitry
On 09/15/2015 08:06 PM, Matthew Flatt wrote:
We left out "libracket3m.a" just to make the distribution smaller
Hello,
I was just able to discover that my program crashes on the
nightly build 6.2.900.17, on Linux. The program has a heavy portion
of math, double and extended unsafe ops, and accesses multiple
low-level libraries. It has crashed after 4 hours of running,
while doing just the same that it had
Matthew,
On 09/21/2015 12:38 AM, Matthew Flatt wrote:
At Sun, 20 Sep 2015 23:53:42 +0300, Dmitry Pavlov wrote:
On Windows, though, I ran into a problem when linking my app
with pre-built libracket3m_9yy8mp.lib :
error LNK2001: unresolved external symbol __imp_scheme_get_mz_setjmp
That is the
I just tried the 32-bit Utah snapshot and 32-bit C app -- build OK,
but the app crashed right on scheme_main_setup with zero pointer
access. It did not even enter my "run" function.
My initial guess is that it's related to thread-local storage and
missing instructions in "Inside". I'll look i
gs in places.)
If you can get any sort of crash report with a stack trace, that
information is often enough for me to either track down the problem or
at least say something about what parts of the example may be relevant.
Thanks,
Matthew
At Mon, 21 Sep 2015 00:08:43 +0300, Dmitry Pavlov wrote:
Hell
, Dmitry Pavlov wrote:
I am going to get you a stack trace.
Am I correct that in order to get the stack trace, I have to rebuild
Racket with -G and run it in gdb?
Racket builds with `-g` by default, but `make install` uses `strip`.
You could configure with `--enable-strip`, or just run
"
Matthew,
It seems that I have lost my grip on the crash.
It has not happened for almost a week---neither with the version
that I build myself, nor with the nightly build where I definitely
saw it. I did not update Racket during this time.
I did not do anything else. I have no idea why it is gone
gets JIT-compiled.
At Thu, 15 Oct 2015 11:56:21 +0300, Dmitry Pavlov wrote:
Matthew,
It seems that I have lost my grip on the crash.
It has not happened for almost a week---neither with the version
that I build myself, nor with the nightly build where I definitely
saw it. I did not update R
Hello,
I vaguely remember that extflonum support was supposed to be turned
off by default in 32-bit Linux releases. OK. But current 32-bit Windows
nightly builds do not provide it either. I did not notice when they
stopped to provide it.
Moreover: I just built Racket from github source on 32-bit
Moreover: I just built Racket from github source on 32-bit Linux with
--enable-extflonum switch to ./configure, and the build version
somehow misses the extflonums:
Actually, not from the github source, but from the snapshot "source +
built packages". I guess it should not matter, though.
Reg
Matthew,
But current 32-bit Windows
nightly builds do not provide it either. I did not notice when they
stopped to provide it.
When I try the 32-bit Windows builds, they seem to have extflonums enabled.
Oh, sorry. It has turned out that I was jumping to conclusion
on this one.
Actually, ex
h string there anymore, so I do not know what to do.
Regards,
Dmitry
On 09/21/2015 08:13 AM, Dmitry Pavlov wrote:
I just tried the 32-bit Utah snapshot and 32-bit C app -- build OK,
but the app crashed right on scheme_main_setup with zero pointer
access. It did not even enter my "r
Matthew,
More than a week has passed since I updated my
installation of Racket. Good news: no crashes
since the update.
Most probably the bug that you fixed was causing the crash.
Best regards,
Dmitry
On 10/31/2015 06:23 AM, Dmitry Pavlov wrote:
Matthew,
Before upgrading to the version
Matthew,
unsafe-extfllong_double_mult: unsupported on this platform
FWIW, my actual program is a C program that uses a Racket library
obtained with raco ctool. I can provide you more details and a
reproducible example if the above is not enough to hunt down
the cause.
I think the problem is
The more interesting thing is that the 'longdouble.dll' is not put
into the runtime directory by 64-bit Racket, too. Still, the 64-bit
program works without any additional effort.
Oops, sorry, I just checked again, the 64-bit Racket fails too.
I think you'll need to call scheme_set_dll_path(
Matthew,
On 11/13/2015 06:33 PM, Matthew Flatt wrote:
I've pushed a change that may solve this problem.
The change was to the way that `--runtime` determines a shared path
prefix among runtime files, so that it can copy them to a new place but
keep relative paths intact. On Windows, the paths b
Matthew,
[...] So, if the immediate
repair doesn't solve the problem for you, a follow-up change might.
[...]
Is it e3d78e4, or it is to be done yet?
Yes, it's e3d78e4.
I hate to tell you this, but the error still remains in the
latest nightly build, Windows i386:
>racket
Welcome to Rac
Matthew
On 11/17/2015 03:50 PM, Matthew Flatt wrote:
I found another place where case-normalization of paths was not handled
correctly.
Your example now works for me with a snapshot build. Can you try the
latest?
Yes the latest build works! Thank you very much.
The case can be finally closed,
Matthew,
On 11/13/2015 06:25 PM, Matthew Flatt wrote:
At Thu, 12 Nov 2015 19:11:28 +0300, Dmitry Pavlov wrote:
The more interesting thing is that the 'longdouble.dll' is not put
into the runtime directory by 64-bit Racket, too. Still, the 64-bit
program works without any additio
Hello,
I edit etc/config.rktd on every installation of Racket to add a path
to my own libraries:
(lib-search-dirs . ("C:/my/libs"))
Older versions of Racket were OK with that setting.
Current version obeys that setting too strongly, forgetting
where its own libraries are. For example, DrRacket
Does anyone have an application using pasteboard%? I want to try one, and I’d
love to see an example.
A (bit underdone) spreadsheed editor using pasteboard% :
https://github.com/kugelblitz/spreadsheet-editor
Available in Racket via raco pkg install spreadsheet-editor
Regards,
Dmitry
-
Hello,
I am writing a paper for a scientific journal. The results that I am
presenting there were obtained mostly in Racket. What is the best way to
give credit to Racket in references? Is there a specific paper I can
reference, or just link the website?
If specifics matter: I am heavily usi
exclusively use
URLs ad bib entries :-)
— Matthias
On Dec 20, 2015, at 7:05 AM, Jay McCarthy wrote:
Hi Dmitry,
This page describes what you should do:
http://racket-lang.org/tr/ > http://racket-lang.org/tr1/
On Sun, Dec 20, 2015 at 5:52 AM, Dmitry Pavlov wrote:
Hello,
I am writin
#lang racket/gui
(require table-panel)
leads to:
standard-module-name-resolver: collection not found
Have you tried raco pkg install table-panel?
Best regards,
Dmitry
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John Carmack uses Racket as script language in Oculus platform.
Not anymore: https://twitter.com/ID_AA_Carmack/status/739289907038801921
Regards,
Dmitry
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I have added some Racket-related information about the Institute of
Applied Astronomy I work in.
Stephen or Racket-devs: feel free to edit it if needed.
Regards,
Dmitry
On 28.10.2017 12:56, Stephen De Gabrielle wrote:
I created a new wiki page
https://github.com/racket/racket/wiki/Friend
Konrad,
I would create a wrapper like this:
(define-fooapi make-foo
(_fun (foo : (_ptr o _foo)
-> (r : _int)
-> (if r (begin (register-finalizer-and-custodian-shutdown foo
destroy-foo) foo)
(error "can not make foo")))
Regards,
Dmitry
On 01/2
Deren,
In addition to what Matthew has said, I guess you need to have a 'main' module
in your language, and provide it to raco exe, too. It can be a dummy module or
not. The requirement of such a module is unclear to me, but it exists.
Here is my working script to pack a standalone interpreter
Hello,
I have a performance problem with loading a Racket program dynamically.
I measure the time taken to execute a program in two different ways:
1. raco make ; time racket
2. raco make my-runner.rkt; raco make ; time racket my-runner.rkt
In the first case, execution takes ~1 second, in
Matthew,
I'm not clear on why you're using `require-input-port` here instead of
`dyanmic-require` with 's path.
Originally, I needed it to prepend "#lang " to the source because I did
not have it in the file.
That requirement is not so strict now and I will be able to lift it if it is
critica
Does the port `p` contain
the source text for , or does it contain the bytecode from
the ".zo" file created by `raco make ?
In this dedicated test, just the source text of and nothing else.
I think this is the main cause of the performance difference, but just
to make sure, does
raco
Matthew,
I can imagine a problem where the "language implementation" is in the
reader, in which case it wouldn't get run when loading from bytecode,
but that doesn't explain why `racket ` works --- unless the
initialization is also triggered by a `main` or `configure-runtime`
submodule, which wo
Hello,
I am doing a Racket interface for a C library and the
garbage collector is my trouble again. I am asking for
advice from Racket FFI masters (actually, from anybody
who knows how to keep persistent callbacks from a C
side to Racket).
Earlier I was doing this:
(define _callback (_fun _int
Matthew,
On 03/15/2018 04:22 AM, Matthew Flatt wrote:
At Wed, 14 Mar 2018 21:56:05 +0300, Dmitry Pavlov wrote:
I suspect that "my-callback" or something linked to it are moved
in memory by the garbage collector, and the pointer kept by
the C library is no longer valid. In the fir
Matthew,
I agree with John on this one.
In case you decide to release the files, you may want to correct
the comment in callback.rkt: it has (define b #f) and (define b null)
where I believe you mean (define b (box #f)) and (define b (box null)),
respectively. Also, among listed options for #:ke
On 03/23/2018 03:58 PM, silverfire...@gmail.com wrote:
Really silly question but I was using the rsvg package with racket/gui on Linux
and everything was working fine. I moved the code over to windows to try it
out (after installing the rsvg package there) and it's complaining that
librsvg
Hello,
I would like to write two seemingly simple macros and I found
no way to do it.
(my-let ((x 2))
(begin
(begin
(begin
(access x)
(access y)
I would like the (access) macro to know at compile (expansion)
time that x is up there in (my-let) macro and y is not.
ax ([x (communicate #'e
(length (flatten (syntax->datum #'e] ...)
body)]))
(my-let ([x '(a b ((c d) 4) (5 9))])
(access x))
;=>
'((a b ((c d) 4) (5 9)) has-tree-nodes 8)
(the answer is 8 and not 7 because it's counting the 'quote in the syntax)
On M
You can "pass" information from one macro to another by binding
information to an identifier defined to be a syntax parameter that
both macros have in scope. You would need to functionally update its
value for each rebinding. Its value would be retrievable with
syntax-local-value.
Like this
Oh, syntax-parameter-value has helped.
#lang racket
(require (for-syntax syntax/parse syntax/transformer)
racket/stxparam)
(define-syntax-parameter my-info '())
(define-syntax (access stx)
(syntax-parse stx
((_)
(printf "my-info = ~v\n" (syntax-parameter-value #'my-info))
Hello,
I am looking for an advice on how to write a macro that is aware of the
information extracted from syntax objects from another macro that is
called "inside" the first one. For instance, let it be the (this) macro
that detects if its argument is an integer or float, and let it be the
(p
f information: the
expanded syntax and the additional property. You can try to encode this with
#'(begin expanded-code property)
or just use a syntax-property, whatever fits best. When the local-expand
returns, take apart the macro and re-do the same thing.
Details in the implem
On 05/27/2018 03:10 PM, Matthew Flatt wrote:
Hi Dmitry,
At Sun, 27 May 2018 14:21:27 +0300, Dmitry Pavlov wrote:
We do not expect Racket users to see a big difference between Racket
v6.12 and Racket v7.0.
I once saw in some text file that extflonums will not make it to Racket on
Chez.
Will
Hello,
Is it possible to render a plot with the legend outside the plotting
area, like gnuplot does with "set key outside" option?
I see only (plot-legend-anchor) parameter for placement of the legend in
different places inside the plot area.
Best regards,
Dmitry
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ub.com/racket/plot/blob/8dcfd7745e2595b8d517fd8cd7c59510efab84a9/plot-lib/plot/private/common/plot-device.rkt#L587
<https://github.com/racket/plot/blob/8dcfd7745e2595b8d517fd8cd7c59510efab84a9/plot-lib/plot/private/common/plot-device.rkt#L587>
Alex.
On Thursday, November 8, 2018
Hello,
My workflow broke because of some mess going on with SSL certificates
or something. I do not understand what is going on and how to fix it.
Could please anybody give an idea?
Here is a link:
https://datacenter.iers.org/data/latestVersion/9_FINALS.ALL_IAU2000_V2013_019.txt
It opens in bro
Neil,
Thank you so much, I did not know that I can play with
the header so easily in get-pure-port.
It turned out that the server expects "Accept:" field
in the request (but does not care much about its value).
So the following code works
#lang racket
(require net/url)
(let* ((url
"https://
An additional reason to do it with Racket's HTTP libraries is so that
one bot someday going crazy doesn't make a devops/sysadmin see that it's
Racket, and think unhappy thoughts about Racket. :)
Agreed.
Best regards,
Dmitry
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Bernard University Lyon, France
- Dmitry Pavlov, IAA of Russian Academy of Sciences, Russia
- Michael Weigend, University of Münster, Germany
- Tatiana Mylläri, St.George’s University, Grenada, West Indies
### Registration and abstract submission
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Hello,
My program demonstrates an unexpected behavior
depending on how I run it.
$
$ racket program.rkt
$ raco make program.rkt
$ racket program.rkt
read: bad syntax `#fx'
in: compiled/subprogram.mylang.zo
context...:
"/path/to/myprogram.rkt": [running body]
temp37_0
for-loop
It would be good if you can share a link to the code. It is difficult to
guess where is the problem is with this information. Is there an online
public repository with the code?
Unfortunately, no. But you are right. I will try and provide an
excerpt on which the crash reproduces.
Best regar
Hello,
I would like to report something that I see as
inconsistent behavior of the bytecode compiler.
The following short program (an artificial minimal
reproducible example) works at first, but fails
after raco make. My OS is Linux.
$ cat one.rkt
#lang racket
(require (for-syntax syntax/pars
Matthew,
The intended error here is "cannot marshal value that is embedded in
compiled code" at `raco make` time, because fxvectors are not supported
as literals. I'll fix the bytecode writer to check for this case.
OK, thank you. What would you recommend, though, to users who want fxvectors
On 5/9/19 12:04 AM, Dmitry Pavlov wrote:
Matthew,
The intended error here is "cannot marshal value that is embedded in
compiled code" at `raco make` time, because fxvectors are not supported
as literals. I'll fix the bytecode writer to check for this case.
OK, thank you.
My guess is that no one uses them currently, because it's rare that
you'd want to trade speed for *im*precision. Single-flonums in Racket
are significantly slower than regular flonums, because they're not
treated as a common case. The only use I can think of, and the one that
inspired the origi
Hello,
Racket is a perfect tool for creating new languages and compilers
for them, everybody knows that.
There is one thing, though, generally available in compilers and
not instantly available in Racket DSL tools (or I just missed it).
How to specify options to the compiler?
Consider a source
Hello,
While we are at it: is it theoretically possible in Racket or Typed Racket (or
will be possible in Racket 2 or Typed Racket 2) to access struct fields without
repeating the name of the struct type again?
Like in C
typedef struct
{
double x;
double y;
} VeryLongStructureName;
VeryL
But yes, this is directly related to the discussion above because with the
field name information, you can write your own accessor.
Yes it will be a way to go in Racket 2.
But for now, https://docs.racket-lang.org/struct-define/index.html might be a
good workaround for your problem.
T
Dear Racketeers,
I, as a programmer in the area of numerics, just evolved to the state
where the following task seem reasonable to work on:
- I need to take (or invent) some DSL for numerical computations.
All I need is: variables and functions, vectors, loops,
arithmetics on numbers and vector
All,
Thank you very much for the provided references.
Robby, John, Jerzy: thanks for the pointer to Jeff Siskind.
His works on automatic differentiation are very interesting.
I should look at his Stalingrad software.
I did not think about automatic vs symbolic differentiation
before; now I am co
RAI seems to be the closest to what I need to do. It has
a DSL with arrays and matrices, it generates C code,
and it even has automatic differentiation, according
to the docs. It is designed for DSP, but probably
can be extended to non-DSP programming. I should
look at it closer.
For the rec
Jack,
There exists a language that wasn't initially designed with racket in mind, but
could easily be a racket #lang. To interop with code already written in this
language, I wanted an easy way to run files that don't have the #lang line.
I had a very similar case when I had to create a comman
Hello,
I would like to report two GUI issues; I do not know is they are related
or not. I ran against those issues while working on spreadsheet-editor.
The task is to clip a row of buttons (column buttons in my spreadsheet).
Below I reproduce the issue using a simpler configuration than I use i
Matthew,
> One possible fix is to add the 'hscroll style to the horizontal panel.
> That change moves the program into "defined behavior" territory, since
> a scrolling panel allows its content to be wider than itself.
I just tried that and I see that it shows a scrollbar under the
panel that I
recommend? Is there a catalog similar to Debian
"unstable" repo that I can sync to?
Best regards,
Dmitry
At Wed, 18 May 2016 23:37:02 +0300, Dmitry Pavlov wrote:
Matthew,
> One possible fix is to add the 'hscroll style to the horizontal panel.
> That change move
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