It works well. Thanks!
- Joe
On Thu, Jun 24, 2010 at 5:24 PM, Jon Rafkind wrote:
> #lang racket
>
> (define-struct foo (x y) #:mutable)
> (define foo-instance (make-foo 1 2))
> (set-foo-x! foo-instance 5)
> (foo-x foo-instance)
>
>
> On 06/24/2010 06:09 PM, Insik Cho wrote:
>
> Hi buddies,
>
>
#lang racket
(define-struct foo (x y) #:mutable)
(define foo-instance (make-foo 1 2))
(set-foo-x! foo-instance 5)
(foo-x foo-instance)
On 06/24/2010 06:09 PM, Insik Cho wrote:
Hi buddies,
When I make an instance of a structure, I want to modify of the value of
members of the instance.
So, can
I have a very hard time parsing this question but you may be
interested in using struct-copy.
Jay
On Thu, Jun 24, 2010 at 6:09 PM, Insik Cho wrote:
> Hi buddies,
> When I make an instance of a structure, I want to modify of the value of
> members of the instance.
> So, can I refer a member of a
Hi buddies,
When I make an instance of a structure, I want to modify of the value of
members of the instance.
So, can I refer a member of a structure as a referent to update it directly?
- Joe
_
For list-related administrative tasks:
http://lis
Barry Brown wrote at 06/24/2010 02:54 PM:
My question is: why were there IBM programmers at the match?
They might've been systems engineers. Or system operators.
I would guess that standard operating procedure was that they be there,
ostensibly to make sure the systems work for the big event
Here's a link to a NY Times blog entry about the match in question:
http://straightsets.blogs.nytimes.com/2010/06/23/logistics-are-put-to-the-test-at-wimbledon/
One commenter pointed out that 48 in binary is 11. More likely, those
boards may be pretty old and the score is encoded in BCD, so
On Thu, Jun 24, 2010 at 11:03 AM, Matthias Felleisen
wrote:
A bit later the sites internet ticker also quit. Same reason. I have
no clue what the number 48 does to computer scientists. I would have
understood 64 perhaps, but the game went even beyond that.
for that kind of fun, i love/hate readin
Quote FAZ:
> Vier Matchbälle hatte Isner in der Partie vergeben, einen bei 10:9, zwei bei
> 33:32 und einen bei 59:58, Mahut wehrte alle ab. Bei 47:47 fiel die
> elektronische Anzeigetafel aus, weil so ein Spielstand nicht vorgesehen ist,
> im Internet war der Score auch nicht mehr zu
On 06/24/2010 04:03 AM, Insik Cho wrote:
Hi buddies,
I like a normal shell interactive environment.
After I'm working in console 'racket,' I don't want to lose all the
definitions I have made.
How can I save the definitions to an external file, i.e., 'xxx.ss'?
Thanks in advance.
- Joe
Copy the definition, paste it into the REPL, and press return. Otherwise
subx:
if (bac >= 0.15)
exit(-1);
else {
drink_beer();
hit_head_with_brick(&SELF);
goto subx;
}
On Thu, Jun 24, 2010 at 12:34 AM, Jordan Johnson wrote:
> See
> http://blog.racket-lang.org/2009/03/drscheme-repl-isnt-lisp.
On Jun 23, Greg Hendershott wrote:
>
> (define (find-elements xexpr tag-name)
> ;; Given an x-expression return a list of all the elements starting
> with tag-name.
> (if (empty? xexpr)
> '()
> (let ([x (first xexpr)])
> (if (and (list? x) (not (empty? x)))
> (i
That fixed it.
Thanks,
Michael
--- On Thu, 6/24/10, Noel Welsh wrote:
From: Noel Welsh
Subject: Re: [racket] Need a namespace
To: "michael rice"
Cc: users@racket-lang.org
Date: Thursday, June 24, 2010, 11:47 AM
Nope, it works as documented. Trying changing the language then, from
R5RS to Mo
Nope, it works as documented. Trying changing the language then, from
R5RS to Module. (But I don't see how you can get that error with the
given program, so I suspect something else is going on.)
HTH,
N.
On Thu, Jun 24, 2010 at 4:44 PM, michael rice wrote:
>
> Are my docs incorrect or out outdat
Are my docs incorrect or out outdated?
Michael
===
From: file:///usr/share/plt/doc/guide/eval.html#%28tech._current._namespace%29
#lang scheme
(eval '(cons 1 2))
This fails because the initial current namespace is empty. When you run
mzscheme in interactive mode (see Inte
You're using a define in a place where you aren't allowed to put a
define. E.g., this will work:
(define foo 1)
This won't work:
(define bar (define foo 1) foo)
N.
_
For list-related administrative tasks:
http://lists.racket-lang.org/listinfo/
I'm getting this:
define: not allowed in an expression context in: (define ns
(make-base-namespace))
>
Maybe it's my language setting, R5RS? Also, I'm using v 4.1.2 on Fedora 13.
Michael
--- On Thu, 6/24/10, Noel Welsh wrote:
From: Noel Welsh
Subject: Re: [racket] Need a namespace
To: "mic
Take a look at Dracula, the ACL2 support from DrScheme. It implements exactly
that behavior. (You may even wish to take a look at our How to prove curriculum
addition to HtDP. We teach freshmen how to prove theorems about graphical
games.)
Two points about it:
1. in the presence of true ef
It works for me...
N.
On Thu, Jun 24, 2010 at 4:01 PM, michael rice wrote:
>
> How do I make an empty namespace in DrScheme?
>
> This doesn't seem to work:
>
> #lang scheme
>
> (define ns (make-base-namespace))
>
>
> Michael
_
For list-related ad
How do I make an empty namespace in DrScheme?
This doesn't seem to work:
#lang scheme
(define ns (make-base-namespace))
Michael
_
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On Thu, Jun 24 2010, Sam Tobin-Hochstadt wrote:
> To quote from Jose's documentation:
>
> "I’ve concentrated initially in supporting those Schemes with the
> richest (to my knowledge) introspection capabilities, namely, Guile
> and Racket."
>
> I assume it's running mostly elisp underneath. :)
N
On Thu, Jun 24, 2010 at 1:31 PM, Valeriya Pudova
wrote:
> Is there any way to make symbols with the prefix ':' behave the same as the
> keywords?
You'd have to write your own reader. Far less work is to adapt to the
current syntax.
N.
_
For list-
On Thu, Jun 24 2010, Shriram Krishnamurthi wrote:
> Is it running Racket underneath?
Yes. And, in fact, Racket is doing most of the work, not only for
evaluation, but also when it comes to obtaining metadata for
completions, showing arities and argument names, listing module exports,
etc., etc.
To quote from Jose's documentation:
"I’ve concentrated initially in supporting those Schemes with the
richest (to my knowledge) introspection capabilities, namely, Guile
and Racket."
I assume it's running mostly elisp underneath. :)
On Thu, Jun 24, 2010 at 9:28 AM, Shriram Krishnamurthi
wrote
Is it running Racket underneath?
On Thu, Jun 24, 2010 at 2:20 PM, Jose A. Ortega Ruiz wrote:
> On Thu, Jun 24 2010, Insik Cho wrote:
>
>> I see.
>>
>> Do you think if emacs is a good tool for editing, saving and executing
>> racket programming?
>>
>> I prefer command-like environment to GUI. But,
On Thu, Jun 24 2010, Insik Cho wrote:
> I see.
>
> Do you think if emacs is a good tool for editing, saving and executing
> racket programming?
>
> I prefer command-like environment to GUI. But, It's inconvenient to
> edit a file and enter! it separately in a shell.
>
> What environment or editor
> See
> http://blog.racket-lang.org/2009/03/drscheme-repl-isnt-lisp.html
> for a detailed answer.
>
I see what the blog post above is saying, but (I know, "no when no if no but"),
has anyone ever used editors for some of the proof assistants, like CoqIDE or
ProofGeneral mode in Emacs for Coq? T
There is other thread about this subject
http://www.mail-archive.com/plt-...@list.cs.brown.edu/msg00959.html
On 24.06.2010 16:31, Valeriya Pudova wrote:
Is there any way to make symbols with the prefix ':' behave the same
as the keywords?
_
F
At Thu, 24 Jun 2010 03:03:08 -0700,
Insik Cho wrote:
> After I'm working in console 'racket,' I don't want to lose all the
> definitions I have made.
>
> How can I save the definitions to an external file, i.e., 'xxx.ss'?
You can try running racket with rlwrap. In addition to giving it
readline s
Is there any way to make symbols with the prefix ':' behave the same as
the keywords?
The document "Keyword and Optional Arguments in PLT Scheme"
Has the next text in the chapter "7.7 Keyword Lexical Syntax"
PLT Scheme uses a #: prefix. Chicken also supports a #: prefix
in addition to a : suff
I use Emacs. See
http://monospaced.posterous.com/up-and-running-with-racket
HTH,
N.
On Thu, Jun 24, 2010 at 11:33 AM, Insik Cho wrote:
> I see.
> Do you think if emacs is a good tool for editing, saving and executing
> racket programming?
> I prefer command-like environment to GUI. But, It's
I see.
Do you think if emacs is a good tool for editing, saving and executing
racket programming?
I prefer command-like environment to GUI. But, It's inconvenient to edit a
file and enter! it separately in a shell.
What environment or editor are you using for racket programming?
- Joe
On Thu,
It doesn't work that way. You should first save your defns in a file
(as a module) and then load that file into racket. If you're working
with command line racket you might want to look at the enter!
function.
N.
On Thu, Jun 24, 2010 at 11:03 AM, Insik Cho wrote:
> Hi buddies,
> I like a normal
Hi buddies,
I like a normal shell interactive environment.
After I'm working in console 'racket,' I don't want to lose all the
definitions I have made.
How can I save the definitions to an external file, i.e., 'xxx.ss'?
Thanks in advance.
- Joe
_
See
http://blog.racket-lang.org/2009/03/drscheme-repl-isnt-lisp.html
for a detailed answer.
Best,
Jordan
On Jun 24, 2010, at 12:12 AM, Mark Carter
wrote:
Scheme newbie here. I've always had a bee in my bonnet for the Lispy
languages, but had never gotten into them fully for one reason o
Scheme newbie here. I've always had a bee in my bonnet for the Lispy languages,
but had never gotten into them fully for one reason or another. I've been
playing with DrRacket, and have been able to plot graphs using it. Way cool!
Anyway, my actual question is: using DrRacket, is there a way of
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