On Jun 23, 2010, at 7:33 AM, Ken Struys wrote:
> Oops forgot the link: http://pandela.com/
FWIW dep't.:
Linode ($20/month) sounds better than this (16 GB, 512 MB ram, etc.).
John Clements
smime.p7s
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___
Pinholes are planned to return, indeed. But they will not return in
the way that they once were there. That is, they will be a more
advanced feature and will only come in if you explicitly start using
them (details forthcoming).
Robby
On Fri, Jun 25, 2010 at 6:51 PM, Paul Ojanen wrote:
> I got t
I got the impression from past discussions that pinholes would return.
_
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org]
On Behalf Of Stephen Bloch
Sent: Friday, June 25, 2010 11:13 AM
To: PLT-Scheme Mailing List
Subject: [racket] confusing graphics primitive
> Meanwhile, configure with `--disable-futures' to disable the use of
> thread-local variables in the run-time system, and then the build seems
> to work ok.
Thank you so much! Yes, this appears to work for me now.
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For list-related administrati
This version misses an explicit combinator passing. Z can be replaced by I,
Z-memoize, Z-verbose or any other, this is the point.
25.06.10, 22:58, "Ryan Culpepper" :
> On 06/25/2010 12:59 PM, Groshev Dmitry wrote:
> > Is there any way to avoid this overhead? I'm really interested in
> > combin
On 06/25/2010 12:59 PM, Groshev Dmitry wrote:
> Is there any way to avoid this overhead? I'm really interested in
> combinator style, but if it makes programs 8 times slower, it is
> useless. Maybe some compiler/macro optimizations is possible?
You might find this version interesting:
(define-syn
Is there any way to avoid this overhead? I'm really interested in combinator
style, but if it makes programs 8 times slower, it is useless. Maybe some
compiler/macro optimizations is possible?
25.06.10, 22:50, "Matthew Flatt" :
> If you're interested in specially the overhead of combinator styl
If you're interested in specially the overhead of combinator style,
then your example still understates the overhead compared to relatively
cheap operations.
In addition to Matthias's change to get rid of `apply', I've revised
your program (see below) to replace `first' and `rest' with `car' and
`
I think you're comparing apples and oranges here.
The use of _apply_ should make things a lost slower
for comb-sum than for sum. Also, you should collect
garbage before you run timed microbenchmarks. Otherwise
you might have bad interactions. With that done, I
get the following results:
> [:~/D
The names were chosen for backwards compatibility. -- Matthias
On Jun 25, 2010, at 11:12 AM, Stephen Bloch wrote:
> There are a whole lot of graphics operations in 2htdp/image, and many of them
> come in pairs: overlay/xy and place-image, add-line and scene+line, add-curve
> and scene+curve,
I've mistyped. In fact things are even worse.
#lang racket
(define-syntax U
(syntax-rules ()
[(_ f) (f f)]))
(define-syntax define/comb
(syntax-rules ()
[(_ comb name (arg . args) f)
(define name
(comb (λ (name) (λ (arg . args) f]))
(define (Z f)
(U (λ (g) (λ x
FWIW, it built and ran fine for me recently under (IIRC) CentOS 5.3 x86
32-bit under XenServer 5.5.
BTW, this is not an endorsement of Xen, and I recommend KVM over Xen for
most techie purposes. If you are able to switch to KVM, you might be
able to do so with less effort than debugging this
Here is the code:
#lang racket
(define-syntax U
(syntax-rules ()
[(_ f) (f f)]))
(define-syntax define/comb
(syntax-rules ()
[(_ comb name (arg . args) f)
(define name
(comb (λ (name) (λ (arg . args) f]))
(define (Z f)
(U (λ (g) (λ x
(apply (f (U g)) x)
Google turns up Xen-related advice about changing "/lib/tls" to
"/lib/tls.disabled", other pages about how you shouldn't have to do
that anymore, and so on. For now, I don't have any explanation for the
behavior that you're seeing other than the possibility that something
about thread-local stor
You can use the installer for ubuntu jaunty, other users claim it
works fine with 10.04. There is a minor glitch with the installer about
an extra README file which you will have to manually delete during the
installer.
Or you can get the source and build it which is usually painless.
http:/
At Fri, 18 Jun 2010 15:10:46 -0400, Danny Yoo wrote:
> I'm seeing the following error when trying to install mzscheme on a
> Xen-hosted virtual environment.
As far as I can tell, the problem is some issue with Xen and
thread-local variables at the OS level.
The crash happens on the last instructi
Hi,
I am a new user and I d like to use Racket 5.0 with ubuntu 10.04.
How can I install it?
Regards,
Flavio
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There are a whole lot of graphics operations in 2htdp/image, and many
of them come in pairs: overlay/xy and place-image, add-line and scene
+line, add-curve and scene+curve, etc. that differ mainly in whether
or not they crop the result to the bounding box of one of the
images. (They someti
Garbage collection is not disabled during an FFI call. In fact, it's
difficult or impossible to disable GC at all.
Finalizers registered with `register-finalizer', however, run in a
separate Racket thread. So there's no particular guarantee that
finalizers will run before a `collect-garbage' call
The errortrace library is good but for development time not for this
case. Also it does not tell error location for each function anyway.
Probably because continuation created not for each function.
But I found another interesting thing. The error message in DrRake and
command line rake are
I suppose the errortrace library might give you more location
information. I have never used it so I can't say much more than read
the docs and/or hope someone else replies.
HTH,
N.
The errortrace library is good but for development time not for this
case. Also it does not tell error lo
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