Fantastic!
Thank you very much, I prefer it over my plugin, because it automatically
gives the doc for the correct identifier.
Just too bad it doesn't appear when syntax-check cannot validate due to
missing parentheses. Maybe that will make me change my coding style to add
closing parens automatica
Oops, meant to reply to let everyone know the --trust flag worked and I got my
PDF. Thanks again.
--Jamie
- Original Message -
From: "Neil Toronto"
To: users@racket-lang.org
Sent: Monday, September 17, 2012 10:15:11 PM GMT -05:00 US/Canada Eastern
Subject: Re: [racket] sandboxing issue
That sounds right. It creates a cache of PNGs (with files named using
MD5 sums) to keep from having to render them every time the slideshow is
run. It needs filesystem access.
Neil ⊥
On 09/17/2012 11:46 AM, Robby Findler wrote:
slideshow --trust
?
Robby
On Mon, Sep 17, 2012 at 12:35 PM, Ja
The simulation collection uses continuations extensively - in essence
it is a continuation engine - and I get very good performance from it,
even for very large simulations.
On Mon, Sep 17, 2012 at 4:24 PM, Matthias Felleisen
wrote:
>
> On Sep 16, 2012, at 2:36 PM, Patrick Useldinger wrote:
>
>>
I consider this a bug in DrRacket, but haven't had time to look into it.
Robby
On Mon, Sep 17, 2012 at 3:27 PM, Greg Hendershott
wrote:
> A tiny, not very important question:
>
> 1. for/fold documentation:
>
> (for/fold ([sum 0]
>[rev-roots null])
> ([i '(1 2 3 4)])
> (va
On Mon, Sep 17, 2012 at 7:15 PM, David Van Horn wrote:
> On 9/17/12 7:11 PM, Jon Zeppieri wrote:
>
>> The fact that the first one works at all should probably be considered a
>> bug. The syntax of case here:
>>
>> http://docs.racket-lang.org/**reference/case.html?q=case#(**
>> form._((lib._racket/
On 9/17/12 7:11 PM, Jon Zeppieri wrote:
The fact that the first one works at all should probably be considered a
bug. The syntax of case here:
http://docs.racket-lang.org/reference/case.html?q=case#(form._((lib._racket/private/more-scheme..rkt)._case))
dictates that the constants in a case clau
The reader turns the 'a into (quote a), so you'd actually also get the 'x1-case
given 'quote.
I don't think this case is a bug so much as a "gotcha."
-Ian
- Original Message -
From: "Jon Zeppieri"
To: "Kieron Hardy"
Cc: "users"
Sent: Monday, September 17, 2012 7:11:03 PM GMT -05:00 US/C
The fact that the first one works at all should probably be considered a
bug. The syntax of case here:
http://docs.racket-lang.org/reference/case.html?q=case#(form._((lib._racket/private/more-scheme..rkt)._case))
dictates that the constants in a case clause be parenthesized.
The more important i
On 9/17/12 6:47 PM, Kieron Hardy wrote:
Hi all,
Can anyone explain why the first function below selects 'x1-case as
expected but the second fails to select 'x2-case? Am I expecting
something to happen that shouldn't?
Thanks,
Kieron.
#lang racket
(case 'a
['a 'x1-case]
['b 'x1-c
Hi all,
Can anyone explain why the first function below selects 'x1-case as
expected but the second fails to select 'x2-case? Am I expecting something
to happen that shouldn't?
Thanks,
Kieron.
#lang racket
(case 'a
['a 'x1-case]
['b 'x1-case]
[(15 2 3) 'y1-case]
[(10 11 12) '
On Sep 16, 2012, at 2:36 PM, Patrick Useldinger wrote:
> Which makes me wonder if continuations are really usable in Racket (in terms
> of performance)?
That is a good question, and the answer is 'yes, in the right situation'. I
think the use in the generator code might be not the right situa
Put the let bindings on one line.
On Mon, Sep 17, 2012 at 3:27 PM, Greg Hendershott
wrote:
> A tiny, not very important question:
>
> 1. for/fold documentation:
>
> (for/fold ([sum 0]
>[rev-roots null])
> ([i '(1 2 3 4)])
> (values (+ sum i) (cons (sqrt i) rev-roots)))
>
>
Matthias, that guide is quite good. I particularly liked the
advise on using /define/ rather than /let/ when possible.
In reading section 4.1 on comments, I could not figure out the
intent/significance of the sentence: "Another use of block
comments is for code samples to be copied and pasted int
It's still a draft.
On Sep 17, 2012, at 4:33 PM, Paulo J. Matos wrote:
> On 17/09/12 21:26, Danny Yoo wrote:
>>
>> Hi Paolo,
>>
>>
>> I prefer internal definitions now in professional code. Internal
>> definitions are recommended by the Racket style guidelines:
>>
>> http://www.ccs.neu.e
On 17/09/12 21:26, Danny Yoo wrote:
Hi Paolo,
I prefer internal definitions now in professional code. Internal
definitions are recommended by the Racket style guidelines:
http://www.ccs.neu.edu/home/matthias/Style/style/Choosing_the_Right_Construct.html#(part._.Definitions)
thanks,
had no
A tiny, not very important question:
1. for/fold documentation:
(for/fold ([sum 0]
[rev-roots null])
([i '(1 2 3 4)])
(values (+ sum i) (cons (sqrt i) rev-roots)))
2. emacs default indent:
(for/fold ([sum 0]
[rev-roots null])
([i '(1 2 3 4)])
(values (+ s
>>
>> (for ([line (in-lines in)])
>>(match (string-split line ",")
>> [(list path modtime-str md5-str)
>> (define modtime (string->number (string-trim modtime-str)))
>> (define md5 (string->bytes/utf-8 (string-trim md5-str)))
>
> why not let for the
On Sun, 16 Sep 2012 13:06:42 -0400, Ryan Culpepper
wrote:
> >On 09/15/2012 11:05 PM, Patrick King wrote:
> > Windows 7, latest 64 bit Racket, latest Scriblogify from Planet.
> >
> > C:\...\Source\SlowFlight\Blog>raco scriblogify -p SlowFlight
> 12-09-15.scrbl
> > file-or-directory-modify-seconds:
On Sep 17, 2012, at 12:44 PM, Robby Findler wrote:
> It will appear when the online check syntax finds some documentation
> for the identifier at the insertion point. If you edit the identifier,
> it will disappear (but it may reappear if you move onto another
> identifier it knows about).
>
> G
On 9/17/12 3:46 PM, Ashley Fowler wrote:
Well i got
(list(car'(())) ===> (())
(list(car'(3))) ===> (3)
You changed the first example. If you plug in '() for ls you should get to:
(list (car '()))
What's the next step?
Are you saying I need to change (list(car ls)) ?
First, you should
Ashley,
I think you're making this more difficult than it needs to be.
-Greg
-Original Message-
From: users-boun...@racket-lang.org [mailto:users-boun...@racket-lang.org] On
Behalf Of Ashley Fowler
Sent: Monday, September 17, 2012 2:46 PM
To: David Van Horn
Cc: users@racket-lang.org
Subj
Well i got
(list(car'(())) ===> (())
(list(car'(3))) ===> (3)
Are you saying I need to change (list(car ls)) ?
From: David Van Horn [dvanh...@ccs.neu.edu]
Sent: Monday, September 17, 2012 3:37 PM
To: Ashley Fowler
Cc: Danny Yoo; users@racket-lang.o
On 09/17/2012 03:35 PM, Kieron Hardy wrote:
Is there actually a reason to use 'set!'?
There is a period of time between creating the message and actually
processing the message. Other events may cause the message to be
abandoned. Therefore I think the set! is required, but maybe there's a
It will appear when the online check syntax finds some documentation
for the identifier at the insertion point. If you edit the identifier,
it will disappear (but it may reappear if you move onto another
identifier it knows about).
Generally speaking, it should match the contents of the blue boxes
On 9/17/12 3:30 PM, Ashley Fowler wrote:
Disregard the last message with the questions, I get what your saying now. I
had to switch the sign.
(define delete-second2
(lambda(ls)
(if(> (length ls) 1) (append(list(car ls))(cdr(cdr ls)))
(list(car ls)
Only problem I got n
> Is there actually a reason to use 'set!'?
There is a period of time between creating the message and actually
processing the message. Other events may cause the message to be abandoned.
Therefore I think the set! is required, but maybe there's a better solution.
Also, it's suspicious that your
On 17/09/12 18:53, Paulo J. Matos wrote:
Even before trying your solution (which I am pretty sure it will ok),
besides having also forgotten how to write proper english...
yours works ok as expected.
--
PMatos
Racket Users list:
http://lists.racket-lang.org/users
Disregard the last message with the questions, I get what your saying now. I
had to switch the sign.
(define delete-second2
(lambda(ls)
(if(> (length ls) 1) (append(list(car ls))(cdr(cdr ls)))
(list(car ls)
Only problem I got now is the first test still doesn't work.
_
On 9/17/12 2:54 PM, Ashley Fowler wrote:
Okay I understand. I made some changes
(define delete-second2
(lambda(ls)
(if(< (length ls) 1) (append(list(car ls))(cdr(cdr ls)))
(list(car ls)
it works for when I do the following tests:
(delete-second2 '(3 7)) ==> (3)
(del
Okay since it is not meaning what I want it to mean, what is is actually
meaning right now?
From: danny@gmail.com [danny@gmail.com] on behalf of Danny Yoo
[d...@hashcollision.org]
Sent: Monday, September 17, 2012 3:18 PM
To: Ashley Fowler
Cc: users
Sorry if this is a dumb question. This small quarter-circle, with an
arrow in it, appears from time to time, and then disappears. It contains
some links to documentation. I cannot tell what is causing it to appear
and what causes it to disappear...? Thanks. --PR
Racket Use
On Mon, Sep 17, 2012 at 12:54 PM, Ashley Fowler
wrote:
> Okay I understand. I made some changes
>
> (define delete-second2
> (lambda(ls)
> (if(< (length ls) 1) (append(list(car ls))(cdr(cdr ls)))
> (list(car ls)
>
> it works for when I do the following tests:
>
> (delete-sec
Okay I understand. I made some changes
(define delete-second2
(lambda(ls)
(if(< (length ls) 1) (append(list(car ls))(cdr(cdr ls)))
(list(car ls)
it works for when I do the following tests:
(delete-second2 '(3 7)) ==> (3)
(delete-second2 '(a b c d)) ==> (a c d)
but it
On 09/17/2012 02:32 PM, Kieron Hardy wrote:
Hi all,
In the following fragment, I'm trying to create a new event, queue a
callback to some handler to process that event, and then clear the event.
(define/private (create-message)
...
(set! the-event (new some-event%))
...
On 17/09/12 19:23, Danny Yoo wrote:
Hi Paolo,
When I look at the program more closely, I think the structure of the
iteration might be improved with a "for" loop and the match library.
I'm trying to avoid let loops these days just because they remind me
too much of GOTO-sytle programming. :)
Hi all,
In the following fragment, I'm trying to create a new event, queue a
callback to some handler to process that event, and then clear the event.
(define/private (create-message)
...
(set! the-event (new some-event%))
...
)
(define/private (queue-message rece
> However, after your email I can see that after (loop (read-line in))
> finishes is going to be executed. And this _has_ to be executed
> unless there was a return or exception in the function, but since we are in
> Racket and I am not playing with call/cc, will be executed no matter
> what.
>
>
On 17/09/12 18:30, Danny Yoo wrote:
I have a trivial question but I desperately need a spare pair or eyes (or
another brain).
The 'when's here look really suspicious. You want control flow to go
exclusively to one or the other path, but when you have 'when' like
this:
... (when )
unl
slideshow --trust
?
Robby
On Mon, Sep 17, 2012 at 12:35 PM, James T. Perconti
wrote:
> Hello,
> I'm trying to make a PDF of a slideshow presentation that uses Jay
> McCarthy's slideshow-latex package from PLaneT. I seem to be running up
> against slideshow's sandbox: the package needs to r
On Mon, Sep 17, 2012 at 11:30 AM, Ashley Fowler
wrote:
> I was just showing my first part lol...but here goes the rest of i below
>
> (define delete-second1(lambda(ls)
> (if(< (length ls) 1)
>(append(list(car ls))(cdr(cdr ls))
>
Hello,
I'm trying to make a PDF of a slideshow presentation that uses Jay McCarthy's
slideshow-latex package from PLaneT. I seem to be running up against
slideshow's sandbox: the package needs to run LaTeX and generate some image
files, and so slideshow is hitting a "slide program attempted t
> I have a trivial question but I desperately need a spare pair or eyes (or
> another brain).
The 'when's here look really suspicious. You want control flow to go
exclusively to one or the other path, but when you have 'when' like
this:
... (when )
unless an exception occurs in the or ,
I was just showing my first part lol...but here goes the rest of i below
(define delete-second1(lambda(ls)
(if(< (length ls) 1)
(append(list(car ls))(cdr(cdr ls))
list(car ls))
On Mon, Sep 17, 2012 at 11:19 AM, Ashley Fowler
wrote:
> Yeah I got a error.
>
> This is what I got so far though.
>
> (if(< (length ls) 1)(append(list(car ls))(cdr(cdr ls)))
I can't read this one-liner. I can't count parens. :)
Let me break it down into a few lines:
Hello,
I have a trivial question but I desperately need a spare pair or eyes
(or another brain).
I have the loop:
(let loop ([line (read-line in)])
(when (not (eof-object? line))
(let ([split-str (string-split line ",")])
(when (not (= (length split-
Yeah I got a error.
This is what I got so far though.
(if(< (length ls) 1)(append(list(car ls))(cdr(cdr ls)))
From: danny@gmail.com [danny@gmail.com] on behalf of Danny Yoo
[d...@hashcollision.org]
Sent: Monday, September 17, 2012 1:15 PM
To: Ash
The documentation for 'if' is here
http://docs.racket-lang.org/reference/if.html?q=if
Here's a slightly modified example from the doc using 'if':
(if (positive? -5)
(error "shouldn't get here")
(display "hi"))
You might want to consider the 'when', documented here
http://docs.racket-lang.org
> delete-second2 takes the same procedure from delete-second1, I just need to
> know how to use the if expression because you have to find out if the list
> has more than one item in order for it to delete anything.
Ok. Let's look at the expression you had written earlier:
(if (> ls 1) )
delete-second2 takes the same procedure from delete-second1, I just need to
know how to use the if expression because you have to find out if the list has
more than one item in order for it to delete anything.
From: danny@gmail.com [danny@gmail.com
On Mon, Sep 17, 2012 at 10:40 AM, Ashley Fowler
wrote:
> Basically delete-second2 has to take a input of a list, if the list has more
> than 1 item then it will delete the second item and return the new list, if
> it doesnt have more than 1 item it will just return the original list.
Let me be
Basically delete-second2 has to take a input of a list, if the list has more
than 1 item then it will delete the second item and return the new list, if it
doesnt have more than 1 item it will just return the original list.
From: danny@gmail.com [danny
> 2. Write a procedure (delete-second1 LS) that takes a list LS of at
> least two items and returns the same list only with the second item
> deleted. You may assume the input list has at least two elements.
>
> Tests:
> (delete-second1 '(3 7)) ==> (3)
> (delete-second1 '(a b c d)) ==> (a c d)
Are you saying the problem is not on-line? There must be some context. --
Matthias
On Sep 17, 2012, at 12:22 PM, Ashley Fowler wrote:
> That was the full problem. It started with #2. I'm just confused on how to
> start #3. I know you have to use a if expression.
>
> 2. Write a procedure (del
That was the full problem. It started with #2. I'm just confused on how to
start #3. I know you have to use a if expression.
2. Write a procedure (delete-second1 LS) that takes a list LS of at
least two items and returns the same list only with the second item
deleted. You may assume the input
On Sep 17, 2012, at 12:11 PM, Ashley Fowler wrote:
> I just wanna know if I am starting the procedure out right? This is what I
> got so far...
> (define delete-second2(lambda(ls)
> (if(>ls 1)
Since you're asking a yes-no question, the answer has to be 'no'.
Can you point us to
I have to write a procedure (delete-second2 LS) that takes an arbitrary list
LS of items and returns the same list only with the second item deleted
if there is no second item, o.w. returns original input list.
I will need to use a conditional. And the tests should be as below.
Tests:
(delete-seco
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