No, that's not the way Racket works. :)
There is something wrong and our messages are designed to figure out
what that is. Thanks for your patience. I think Matthew's message is
next on the list to answer.
Robby
On Wed, Jun 27, 2012 at 10:15 PM, Chad Albers wrote:
> Yes, intel/amd 64 bit.
>
> I
Yes, intel/amd 64 bit.
I don't have a .racketrc...I need to find out why I need that in the docs.
I did you -j and success! I got a stack trace.
So, that brings up a question. Is there a way to support stack traces
without disabling the jit compiler? I understand that stack traces add
a certa
I should have also mentioned that using -j to disable the JIT (as Robby
suggested) should also give you context independent of the platform or
the way that Racket is compiled.
At Wed, 27 Jun 2012 20:28:53 -0600, Matthew Flatt wrote:
> I wonder whether the problem could be related to compilation op
I wonder whether the problem could be related to compilation options.
Did you compile your own executable? If so, what flags were given to
`configure' and/or the C compiler?
On x86_64 Linux, Racket uses DWARF information to walk parts of the
runtime stack. It occurs to me that if you use gcc witho
At Wed, 27 Jun 2012 18:20:45 -0400, Neil Van Dyke wrote:
> Question: If I put a "log-debug" into that "(lambda (self) ...)" proc,
> looks like the proc is applied every time i call "sync". If the
> "log-debug" isn't in there, is the overhead of applying that proc and
> "wrap-evt" each time I ca
Matthew Flatt wrote at 06/27/2012 05:41 PM:
At Wed, 27 Jun 2012 17:34:27 -0400, Neil Van Dyke wrote:
If I have a struct that wraps an input-port, and I want the struct to be
usable as an event that returns the struct as the sync result... is
there an better way than the code below?
Yo
At Wed, 27 Jun 2012 23:14:21 +0200, Petr Samarin wrote:
> I was trying out some examples from the documentation and used openGL code
> outside of openGL context!
That makes sense. I vaguely recall that Apple's GL is likely to crash
without a context, while other GL implementations tend not to cra
At Wed, 27 Jun 2012 17:34:27 -0400, Neil Van Dyke wrote:
> If I have a struct that wraps an input-port, and I want the struct to be
> usable as an event that returns the struct as the sync result... is
> there an better way than the code below?
You can use a procedure that receives "self" as the
If I have a struct that wraps an input-port, and I want the struct to be
usable as an event that returns the struct as the sync result... is
there an better way than the code below?
In the code below, I am using "letrec" to get around the fact that
AFAIK, I need my "wrap-evt" proc arg to refer
I was trying out some examples from the documentation and used openGL code
outside of openGL context! Here is the code to reproduce the error:
(require sgl/gl
sgl/gl-vectors)
(glBegin GL_TRIANGLES)
(glVertex3i 1 2 3)
(glVertex4fv (gl-float-vector 1 2 3 4))
(glEnd)
It would be nice to g
I don't have any immediate ideas. I've always used the Apple libraries,
and they work for me.
Do you see the crash just running one of the GL-based games in the PLT
Game application (such as Jewel or Gobblet)?
Can you send more of the crash report?
At Wed, 27 Jun 2012 15:04:43 +0200, Petr Samari
I am a novice programmer learning it primarily through How to Design
Programmes, 2nd edition. I have to say it is a unique book, as it claims
and superbly designed and written. I think any one who wants to learn
programming should go through the entire book - if he/she knows it, the
progress will
And there are a lot of other list-like data-structures that make
certain operations better (at the expense, sometimes, of different
ones):
https://github.com/takikawa/tr-pfds
On Wed, Jun 27, 2012 at 11:06 AM, Danny Yoo wrote:
>
>
> On Wednesday, June 27, 2012, Harry Spier wrote:
>>
>> Is the lis
On Wednesday, June 27, 2012, Harry Spier wrote:
> Is the list processing function "last" expensive? Does it traverse
> the entire list to get the value?
>
>
Random access in a linked list is costly, so yes. If you need fast random
access, vectors and gvectors may be appropriate.
Is the list processing function "last" expensive? Does it traverse
the entire list to get the value?
Thanks,
Harry
Racket Users list:
http://lists.racket-lang.org/users
On Jun 27, 2012, at 12:39 PM, Kieron Hardy wrote:
> Thanks Danny, that's a step in the direction I wanted to go.
>
> But on further reflection, I think what I was looking for (i.e. have some
> class that stops it's own instantiation and defers to another class depending
> on some parameter val
Thanks Danny, that's a step in the direction I wanted to go.
But on further reflection, I think what I was looking for (i.e. have some class
that stops it's own instantiation and defers to another class depending on some
parameter value(s)) doesn't really make sense. Instead I need some sort of
By 64 bit architecture, I assume it is an intel/amd chip?
What happens if you pass -j on the command-line to racket when you try
this? (You don't have a .racketrc, right?)
Does the test suite pass? You'd run that with
racket -qr plt/collects/tests/racket/quiet.rktl
(where "plt" is the path t
> Any idea why? Did you trace everything under a custodian to catch all
> threads etc, and ran without places?
I ran Scribble directly through the command line program 'scribble'.
As far as I can tell, under that environment, there are no direct uses
of threads or places, so the profile should be
On Jun 27, 2012, at 1:39 AM, m...@goblin.punk.net wrote:
> I am planning to work through _How to Design Programs_ but
> already have some (imperative) programming experience as well as
> some exposure to Racket/Scheme.
>
> I found the following piece of advice in the mailing list
> archive. An
Oke,
If I understand this the struct Vanimal is not a part of the programm ?
Roelof
Op 27-6-2012 15:56, Matthias Felleisen schreef:
1. You got trapped in a strange corner of the language:
-- to ask whether some value is a a Vcat you should use Vcat?
-- BSL should not really allow you to s
1. You got trapped in a strange corner of the language:
-- to ask whether some value is a a Vcat you should use Vcat?
-- BSL should not really allow you to say 'Vcat' all by itself.
[I need to investigate this problem. Sadly it is not a bug.]
2. Try to understand this:
(define-struct Vcat
FFI bindings for openGL do not work when "glu-lib" and "gl-lib" in gl.rkt are
linked to Apple's own openGL libraries in:
"/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL"
"/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGLU"
Any use of functions provided
>
> Looking at this smaller example, I think that the nested recursion in
> expansion of `for*/list` is confusing Typed Racket. I'll look into
> why that is, and if it can be fixed. In the meantime, you ought to be
> able to rewrite the loop to use `for/fold:` and `reverse` to work
> around this
Hi Eli,
Here's the file that I'm running in a gist: https://gist.github.com/3003496
In other words, it's a cut-and-paste of code that you posted earlier
in this chain:
#lang racket
(with-handlers ([void (λ (e)
(continuation-mark-set->context
(ex
Hello,
I try to figure out how I can check if a struct is a Vcat or a Vcham.
So i tried this:
; – a VCham
(define-struct Vanimal (animal))
; a struct has two parts ( the x-coordinate of a cat and the happiness
of the cat)
(define-struct Vcat [x happiness])
; make Vcat : number (x) number (h)
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