gt; you'll need to render it as a string. In the case of the result of
> formlet display, that means something like
>
> @in[xe (formlet-display f)]{ @(xexpr->string xe) }
>
> or just
>
> @(map xexpr->string (formlet-display f))
>
> Jay
>
> On Fri, Jan
Hi,
sorry for coming with a web server-related question again already, but I have
problems figuring out how to display formlets inside templates.
I've tried several ways, the latest being:
...
(send/suspend/dispatch
(lambda (make-url)
(get-main-template #:title "start"
tton-formlet
> (formlet
> (div
>,{(default #"default" (radio-group (list #"Chocolate" #"Vanilla"
> #"Strawberry") "flavor")) . => . ci} )
> (list ci)))
>
> Hope this helps,
>
> Shad
>
> On 12/27/2011 3:20
Jay,
>
> Such radio groups have not yet been implemented, it should be
> straight-forward to do so though. You could look at the code in
>
> https://github.com/plt/racket/blob/master/collects/web-server/formlets/input.rkt
>
> around multiselect-input for a way to do it.
thanks for the pointer
gt;(binding:form #"input_1" #"false")))
> (show-example (list (binding:form #"input_0" #"true")
>(binding:form #"input_1" #"false")
>(binding:form #&quo
Hi,
it's me again, and whereas I don't know how dumb I am I sure might have been a
bit lazy :-;
Unfortunately, even after taking a bit more time, I don't know how it works.
Lastly, I've been trying this, which displayed fine:
(define f-choose-db
(let ((o (radio #"orcl" #t))
(r (radio
Hi all,
could someone perhaps point me to a simple formlet example including not just
text inputs, but also radio buttons and check boxes?
>From the formlet syntax shown in Continue and the Formlets chapter,
>unfortunately I have problems understanding how the syntax for radio buttons
>and chec
Hi Neil,
may I ask when you plan to officially release it?
(Looking forward to "having all in one place" instead of updating from github
:-;)
Thanks,
Sigrid
_
For list-related administrative tasks:
http://lists.racket-lang.org/listinfo/users
Hi Matthias & Ryan & all,
>
>
> Sigrid, this sounds like a context-dependency. That is, you use the same
> language (in the sense of API) but depending on the DB to which you bind the
> meaning is subtly different with implications for correctness and
> performance.
>
> I am wondering whet
Hi Neil, hi all,
>>
>
> Regarding Oracle and DB2, I suspect that anyone invested in one of those
> could use some of the open source Racket interfaces for other RDBMSs as
> examples for supporting another RDBMS. The cost might be relatively
> minor (considering the large existing investment
1 um 02:59 schrieb Doug Williams:
> Let me know if there is anything I can help you with.
>
>
> On Friday, July 22, 2011, keyd...@gmx.de wrote:
> > Hi Doug,
> >
> > thanks for the pointer! I didn't know the science collection before, but
> > now I see the
1 um 19:05 schrieb Doug Williams:
> The science collection has histograms and extensions to the PLoT
> package for them. The x-axis is numeric. But, you can look at the code
> and see how to extend the PLoT package plots.
>
> Doug
>
> On Friday, July 22, 2011, keyd...@gmx.de w
Hi,
I'd like to know if using PLoT, there is any way to have the x-axis values
being categories (like e.g., weekdays...), and having the x-axis labeled
accordingly?
Ideally, it's histograms I'd like to show, but I assume this is not possible,
or is it somehow?
Many thanks for your help,
Sigri
Hi Thomas,
many thanks for your reply!
>
>
> the declaration of the wrapper function looks correct. For the ind_ptr
> argument you could actually pass an array of booleans instead of some
> structure,
I might try this instead, and see if I get the same error ... But I find your
arguments aga
Hi all,
sorry I'm coming with an FFI question again ... I am stuck with an error
passing a cstruct to a function for output, but unfortunately I'm not sure the
problem is in my Racket code (I'd hope so, because in that case, I might hope
for some help :-;)
I need to define a function
boolean
Hi Thomas,
thanks again for your "lecture in c thinking", this is very helpful for someone
who made her way into programming, and IT in general, starting with Java 5 and
Racket (pardon me, it used to be called scheme then :-; ) :-)
>>
>
> Correct, the caller has to provide a storage location
Just out of curiosity, I also ran my original code on a manually compiled
32-bit version of DrRacket I have, and there it indeed worked fine :-;)
So, thanks again!
Sigrid
Am 16.07.2011 um 02:40 schrieb Jon Zeppieri:
> On Fri, Jul 15, 2011 at 4:28 PM, keyd...@gmx.de wrote:
>
> [sn
Hi Thomas,
thanks a lot for your quick answer!
> :-/ Perhaps _long or _intptr would be a better choice than _int, since
> they would adapt to the system's word size, which is more likely to be
> right everywhere than _int that is always 32 bits wide, according to the
> Racket documentation, but
Hi,
I am kind of stuck trying to get the current microsecond from gettimeofday...
and I wonder how best to systematically approach the question of what racket
datatype to choose when defining a FFI function.
From the man page I see that timeval is defined as
struct timeval {
time_
Hi Thomas,
thanks a lot for your char * vs char** explanation!
>
> But if there is no sure way to guess the correct buffer size before
> the function call, your only failsafe option is to invoke the function
> repeatedly with increasing buffer sizes as long as it reports
> failure.
I see... but
Hi Thomas,
thank you, too, very much for your solution! I had already successfully tried
Ryan's way, but it's always good and instructive to learn several ways - now I
know 2 ways to allocate a byte buffer and to cast it to a string afterwards :-)
I've tried your solution, and it worked perfect
he database talked to by the c library... :-) ). But
this is something I have to investigate.
Many thanks again for your help!
Sigrid
Am 11.06.2011 um 12:16 schrieb Ryan Culpepper:
> On 06/11/2011 12:54 AM, keyd...@gmx.de wrote:
>> Hi again,
>>
>> sorry for again asking such a b
Hi again,
sorry for again asking such a basic FFI question, but I have a problem getting
an output string from the C side...
E.g. in one case, in my first attempt
(def-ocilib datetotext OCI_DateToText : (date_ptr : _pointer) (fmt : _string)
(size : _int) (strval : (_ptr o _string)) -> (result
Hi Thomas again,
for time reasons, I'm answering the second (or rather, first) part of your mail
separately :-;
Just wanted to say that your code suggestion
>
>
> (define (string-list->fixed-width-array width items)
>(string-join (map (cut string-pad-right <> width #\null) items)))
was
Hi Thomas,
thanks a lot for your answer!
>
> if dtext is actually an alias for char, as you write, then the
> signature of the C function implies that it expects a string, not a
> list of strings, as its third argument.
Oh, you are right, of course! I was mislead by the integer case, where ind
Hi all,
I have a problem with FFI which is certainly due to my lack of experience with
c, and would very much appreciate any help.
I am using (_list i _string) to pass an array of strings to a c function, but
all that ends up on the other side seems to be "nonsense" / random characters.
The c f
>
>>> The cairo_clip_extents() function is used to implement the `is-empty?
>>> method of region%, for which I can find no uses anywhere in the Racket
>>> source tree.
>>>
>>> So, if you change "collects/draw/unsafe/cairo.rkt" around line 124 to
>>>
Hi Erich,
thanks for the hint - this is a VERY cool tool indeed!
Good to know even in case it won't work in my current circumstances...!
Unfortunately I don't have much time to invest today - I just made a short
test and discovered that while my Linux "source" is 64bit, my VirtualBox RedHat
ap
, it'd be good to know what to do!
Ciao,
Sigrid
Am 29.03.2011 um 11:27 schrieb Noel Welsh:
> On Tue, Mar 29, 2011 at 10:22 AM, keyd...@gmx.de wrote:
>> The one executable I got to start without errors (that is to say, I tried
>> mred too, it started but with errors) was mre
(_ptr o _double))
>-> _void
>-> (values x1 y1 x2 y2))
>;; Adding this part:
>#:make-fail make-not-available)
>
> does that fix the problem, or are there other missing functions?
>
>
> At Mo
Hi,
I've encountered the exactly same problem today, running on Oracle Linux (= Red
Hat 5.5, approximately)...
Would anyone know a workaround for this, or if any not-too-outdated racket
version would run with the old libcairo version?
Unfortunately I have no alternative to installing racket on
Hi all,
I've just started trying to use the FFI, and although I'm much afraid that
being a person without any C programming experience and never having used a FFI
either, I might not get too far with it, I don't want to give up early :-;
The first "bigger" problem that comes up is,- I wonder h
Hi,
just a short question regarding testing in typed racket - might it be that I
can use
#lang typed/racket
(require typed/rackunit)
to write "simple checks" with check-equal? etc., but that test-case. test-suite
etc. are not intended for general usage yet
(although they seem to be provided i
Thanks a lot to all of you for your hints and pointers to such interesting
information!
In fact for practical purposes, I will experiment with GPS first and see how
this works (from a first impression, the acceleration data from the phone seem
extremely "hyper-sensitive", so it might anyway tur
..
Could you perhaps point me to another way of running tests with typed racket,
so I wouldn't need the no-check? (I mean writing, not running, I don't need any
fancy GUI :-;)
Many thanks,
Sigrid
Am 30.11.2010 um 02:47 schrieb Sam Tobin-Hochstadt:
> On Mon, Nov 29, 2010 at 3:2
Hi,
this is rather off topic, but as I can't find any useful information googling
and know the nice and helpful people on this list, I try asking :-)
(Also, it's peripherally related as it's about calculating velocity from a
smartphone's acceleration data using moby :-;)
To calculate velocity
>
> I would keep using `define-struct:' for the time being; I'll
> investigate why this isn't working. It isn't obvious at first glance,
> but the `struct:' code is doing some complicated tricks.
I was already suspecting that struct: must somehow be different from
define-struct: in TR, because
Hi,
changing some typed racket code from using define-struct: to struct:, I have
problems getting my test code to run.
While still using define-struct:, I had a language specification of #lang
typed/racket/no-check, because omitting the "no-check" I was getting the
Type Checker: Error in macro
> It might be that the velocity calculations really need to be done from
> the Java side of things to get the right performance. If that's the
> case, I can sketch out the extensions to Phonegap.
Perhaps my question was a bit too rash, I should perform some more tests before
(at least before ca
Hi,
on my phone, when I use on-acceleration (updating every 0.1 seconds, as is the
default in moby's phonegap fork) and on-tick (delay = 1sec) together, on-tick
gets extremely slowed down, that is, completely unusable...
Does anyone have a similar experience, and perhaps an idea what to do here?
Hi Eli,
thanks a lot for the hint! This looks exactly like the kind of introduction I
was looking for :-)
ciao
Sigrid
Am 11.11.2010 um 19:52 schrieb Eli Barzilay:
> You can also try this http://tmp.barzilay.org/tutorial.txt for a more
> gentel introduction to making up languages -- though it
Hi Matthias, hi all,
> We are concerned with the production of complex DSLs and haven't made the
> production of easy DSLs -- like the one you see on Linkedin -- easy.
>
Yes, I understand that. It makes me think of my general experience with the
Racket documentation - even with the Guide, wh
b Grant Rettke:
> On Wed, Nov 10, 2010 at 2:50 PM, keyd...@gmx.de wrote:
>> does anyone know of a tutorial / howto - like text regarding writing DSLs?
>> I've read the "creating languages" chapter in the racket guide, but while I
>> find it "technically und
Hi,
does anyone know of a tutorial / howto - like text regarding writing DSLs?
I've read the "creating languages" chapter in the racket guide, but while I
find it "technically understandable" I'm a bit at a loss as to "what to do in
order to reach which goal" - the chapter explains the technical
That sounds good! Then I should definitely try and compare both measures!
Thanks,
Sigrid
>
> GPS is very precise for differential measurements. It's the absolute
> accuracy that lets you down.
>
> Anthony
_
For list-related administrative task
n't /really/ know, but isn't one reading from the accelerometer
> > and the other from GPS? The answer depends, I think, on the distance
> > over which you want to operate. If you want velocity from, e.g., hand
> > movements, the accelerometer is the way to go. If you wa
nds, I think, on the distance
> over which you want to operate. If you want velocity from, e.g., hand
> movements, the accelerometer is the way to go. If you want velocity
> over large scale (metres, kms) use GPS.
>
> HTH,
> N.
>
> On Tue, Nov 2, 2010 at 5:52 PM, keyd...@gmx.d
Hi,
I am wondering how best to calculate velocity in a moby/phonegap/android
application.
In general, would anyone have experience (or intuition) whether velocity might
better be calculated from the acceleration values delivered by phonegap's
Acceleration object, or directly be extracted from t
Hi Danny,
thanks for the information, I will definitely check it out!
Speaking of "checking out", should I check out the 'mzc' branch to be able to
more conveniently inspect the code from under the 'phone' directory, or will
this be merged into the 'master' branch?
(I've only worked with cvs and
imagine helping develop the Android interface code
further (like e.g. for the "location" stuff I mentioned) if that was welcome :-)
Ciao,
Sigrid
>
> --
>
> Message: 2
> Date: Tue, 26 Oct 2010 22:54:17 +0200
> From: "keyd...@gmx.de"
Hi Danny,
thanks a lot for the explanation,- it worked fine, and this is very cool!
But you know, the reason I wanted to look into the source was that as a new
and proud I-never-thought-I'd-buy-something-like-that-in-my-life owner of an
Android smartphone, I wanted to look into how Moby interfa
Hi,
I've installed moby from git and am following steps 5.3 and 5.4 from the
documentation.
However, I get the following errors:
$ ./bootstrap-js-compiler.ss
./bootstrap-js-compiler.ss: line 3: syntax error near unexpected token `only-in'
./bootstrap-js-compiler.ss: line 3: `(require (only-in
>
> Have you read the Guide?
Caught again :-; Well I guess that when I first got acquainted with PLT scheme
(in 2008 I think), having read (or reading in parallel) SICP, the former
edition of Dybvig's book on scheme (or rather, the first parts of it) and
perhaps some other stuff I don't reme
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