Hello,
I have written a number of programs that attempt to farm work out
to a number of places... for example, the attached file which calculates
the square of *ALL THE NUMBERS* between 0 and 99 inclusive!
Intermittently, this pooling loop stops (usually at the last place)...
e.g.
Hi,
a program I'm working on uses hashes of vectors to organize data. The
vectors are the same length and need to be summed over the hash keys.
The obvious solution uses a double for loop: one for the keys of the
hash and one over the vector indices. Thinking about it I decided that
the most
Hello,
Section 12.1.5 of the docs suggests that it should be possible to use
file ports for accessing serial communications, such as
(define-values (inport outport) (open-input-output-file com1))
That works, but
inport
#input-port:c:\personal\racket\v1.1\com1
and likewise
outport
Thanks, that sort of works, but only sort of... here is the portmon
trace - it turns out that the open won't quite work, and nothing is
output until the port is being closed - looks like some setup of the
port is missing (eg setting output buffer size). Is there any more
info available on
At Tue, 13 Mar 2012 17:00:12 +0100, Rüdiger Asche wrote:
Hello,
Section 12.1.5 of the docs suggests that it should be possible to use
file ports for accessing serial communications, such as
(define-values (inport outport) (open-input-output-file com1))
That works, but
inport
At Tue, 13 Mar 2012 17:20:12 +0100, Rüdiger Asche wrote:
Thanks, that sort of works, but only sort of... here is the portmon
trace - it turns out that the open won't quite work, and nothing is
output until the port is being closed - looks like some setup of the
port is missing (eg
Hi all,
I'm trying to write a checker script for the handin server (which is running on
my Mac), and when i try handing an assignment in to it, I am getting the error
that read access to my preferences file is denied:
ERROR: file-or-directory-modify-seconds: 'read' access denied for
I've seen this occasionally too from rudybot; I'll see if I can get a
stacktrace next time it happens (doubtful but you never know).
On Tue, Mar 13, 2012 at 1:48 PM, Robby Findler
ro...@eecs.northwestern.edu wrote:
Do you get a stacktrace with the error?
Robby
On Tue, Mar 13, 2012 at 3:06
Yeah, I think it would help a lot to see the call to preferences:* and
then we can figure out either how to eliminate it or to understand why
it can't easily be eliminated and thus access should be granted or the
library avoided or something else.
Robby
On Tue, Mar 13, 2012 at 4:29 PM, Eric
I'd like to be able to create a nested for where the depth of nesting is
determined dynamically.
For example, instead of
(for* ((a '(0 1)) (b '(0 1))) (printf ~v~v a b))
I could just say
(myfor (2 '(0 1)) body with some means of extracting nested values).
such that the above as (myfor (3
What, like this?
(define-syntax-rule (myfor bindings (arity rhs) body)
(let ([bindings (make-vector arity)])
(let theloop ([i arity])
(cond [(zero? i) body]
[else
(for ([a rhs])
(vector-set! bindings (- arity i) a)
(theloop (sub1
To add to prior query - here's what I did, but I just think there *must* be
a more elegant solution.
(define (nestfor depth forclause todo)
(define (nf depth forclause todo resultant)
(for ((x forclause))
(if (= depth 1)
(apply todo (append (list x) resultant))
(nf
May I propose a slightly more useful macro instead:
#lang racket
(define-syntax (myfor stx)
(syntax-case stx ()
[(_ (i ...) for-clause todo ...)
#'(for* ([i for-clause] ...) todo ...)]))
(define (nestfortest . args) (displayln args))
(myfor (a b c) '(1 2)
(displayln `(,a
Does typed racket support mutually recursive structure definitions?
(struct: A ([ b : B]))
(struct: B ([a : A]))
Thx,
Ray
Racket Users list:
http://lists.racket-lang.org/users
Please ignore. Just not my day ...
On Tue, Mar 13, 2012 at 8:29 PM, Ray Racine ray.rac...@gmail.com wrote:
Does typed racket support mutually recursive structure definitions?
(struct: A ([ b : B]))
(struct: B ([a : A]))
Thx,
Ray
Racket Users list:
Dear list members,
When I open one of the files I'm editing in DrRacket there is a CRLF
displayed with an orange background in the lower right side of DrRacket
just before the current line and column numbers.. This only happens with
this one file. When I open other files the CRLF indicator
When you see that, it means that DrRacket is going to write the line
breaks in the editor as \r\n instead of just using \n.
DrRacket goes into that mode when it opens the file and finds a file
that is both non-empty and all line breaks are \r\n line breaks (ie if
there are both crlf and other
Thanks - did not post reply properly - this is very useful, as is the prior
example in a different way (yours does not seem to allow the list of
iteration variables to be provided dynamically, e.g., as a list, the prior
has no such list, but I can index into the values). Both can fit my needs
You can do this without a macro:
- (let loop ([depth 3] [l '()])
(if (zero? depth)
(printf ~s\n (reverse l))
(for ([i 2])
(loop (sub1 depth) (cons i l)
(0 0 0)
(0 0 1)
(0 1 0)
(0 1 1)
(1 0 0)
(1 0 1)
(1 1 0)
(1 1 1)
Or to get a list of
myfor is 'dynamic' in that it expands to the desired depth but yes, I need to
know the number at compile time.
The advantage is that I get a variable list of my choice
On Mar 13, 2012, at 10:00 PM, rob cook wrote:
Thanks - did not post reply properly - this is very useful, as is the prior
6 hours ago, Jordan Johnson wrote:
Can you identify what may be triggering the attempt to read
preferences, and how I can either avoid it or grant appropriate read
permissions? Thanks...
You can grant permissions with `sandbox-path-permissions' -- but note
that this could be a security hole
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