Hendrik Boom wrote:
On Wed, Dec 01, 2010 at 08:12:17PM -0800, YC wrote:
Thanks Hendrik for both responses - please see inline.
On Wed, Dec 1, 2010 at 7:23 PM, Hendrik Boom wrote:
The immutable hash table doesn't work well for lexically scoped
variables.
You can end up with multiple simultan
On Wed, Dec 01, 2010 at 10:34:48PM -0500, David Van Horn wrote:
> On 12/1/10 10:14 PM, Hendrik Boom wrote:
>> On Wed, Dec 01, 2010 at 09:09:04PM -0500, David Van Horn wrote:
>>> On 12/1/10 9:03 PM, YC wrote:
Thanks - I have read the substitution part of PLAI and thought of using
substitut
On Wed, Dec 01, 2010 at 08:12:17PM -0800, YC wrote:
> Thanks Hendrik for both responses - please see inline.
>
> On Wed, Dec 1, 2010 at 7:23 PM, Hendrik Boom wrote:
>
> >
> > The immutable hash table doesn't work well for lexically scoped
> > variables.
> >
> > You can end up with multiple simul
My $0.02: Most of the time when I hit the docs for a function, all of
the information I need is in the blue box: usually I'm looking at the
contracts, but the argument labels help me when I forget the order
things go in. I'd be happy with a tool that showed just the contents of
the blue boxes,
On Wed, Dec 1, 2010 at 7:39 PM, David Van Horn wrote:
>
> You can't substitute in values for variables that are set!; you need to use
> the techniques in the paper Shriram suggested, but the substitution model
> and effects can be made to work.
>
> To get the five minute version of Felleisen & Hi
Thanks Hendrik for both responses - please see inline.
On Wed, Dec 1, 2010 at 7:23 PM, Hendrik Boom wrote:
>
> The immutable hash table doesn't work well for lexically scoped
> variables.
>
> You can end up with multiple simultaneous bindings of the same
> variable in different contexts. Look u
On 12/1/10 9:52 PM, YC wrote:
Thanks David, please see inline.
On Wed, Dec 1, 2010 at 6:09 PM, David Van Horn mailto:dvanh...@ccs.neu.edu>> wrote:
This is not entirely true, but substitution and effects are subtle.
I can see that it works if things are by-reference, but by-value will
app
On 12/1/10 10:14 PM, Hendrik Boom wrote:
On Wed, Dec 01, 2010 at 09:09:04PM -0500, David Van Horn wrote:
On 12/1/10 9:03 PM, YC wrote:
Thanks - I have read the substitution part of PLAI and thought of using
substitution as well, but it seems that substitution does not constitute
the full soluti
On Wed, Dec 01, 2010 at 05:00:51PM -0800, YC wrote:
> On Wed, Dec 1, 2010 at 4:13 PM, Hendrik Boom wrote:
>
> >
> > I'm not sure I understand the question, though I suspect I may know the
> > answer. Could you be a bit more specific?
> >
>
> Yes - definitely. See below.
>
>
> > I'm not sure
On Dec 1, 2010, at 9:38 PM, Eli Barzilay wrote:
> Two hours ago, Greg Hendershott wrote:
>>> I wonder whether help could display contracts if the module use
>>> provide/contract to export f.
>>
>> I like this idea.
>
> I don't think that combining all of these is right.
If there is no other
On Wed, Dec 01, 2010 at 09:09:04PM -0500, David Van Horn wrote:
> On 12/1/10 9:03 PM, YC wrote:
>> Thanks - I have read the substitution part of PLAI and thought of using
>> substitution as well, but it seems that substitution does not constitute
>> the full solution:
>>
>> * it only work with
Thanks David, please see inline.
On Wed, Dec 1, 2010 at 6:09 PM, David Van Horn wrote:
>
>> This is not entirely true, but substitution and effects are subtle.
>
I can see that it works if things are by-reference, but by-value will appear
to be broken, no?
> * it does not address closure
On 01.12.10 21:40, Matthew Flatt wrote:
Can you try the latest build?
It's v5.0.99.4 at http://pre.plt-scheme.org/installers/
I'm optimistic that this version will solve both the preference-panel
problem and the command-key problem that you're seeing.
Thank you very much, this was quick. I've
Two hours ago, Greg Hendershott wrote:
> > I wonder whether help could display contracts if the module use
> > provide/contract to export f.
>
> I like this idea.
I don't think that combining all of these is right. To go over the
various pieces there are three that are very different:
1. (help
On Wed, Dec 1, 2010 at 6:08 PM, Shriram Krishnamurthi wrote:
> Then you're ready to read the Felleisen-Hieb semantics to understand
> how to handle state (and just about everything else in the universe).
>
> It's a tour de force, which is why I don't recommend it to beginners:
> they usually have
Then you're ready to read the Felleisen-Hieb semantics to understand
how to handle state (and just about everything else in the universe).
It's a tour de force, which is why I don't recommend it to beginners:
they usually have no idea what it's saying or why it matters. But
your questions suggest
On 12/1/10 9:03 PM, YC wrote:
Thanks - I have read the substitution part of PLAI and thought of using
substitution as well, but it seems that substitution does not constitute
the full solution:
* it only work with side-effect free code
This is not entirely true, but substitution and effect
On Wed, Dec 1, 2010 at 5:25 PM, David Van Horn wrote:
>
>
> An evaluator can implement function application using substitution, i.e.
> you can evaluate ((lambda (x) e) v) by evaluating the substitution of v for
> x in e.
>
> Or, you can be lazy and defer the substitution. In that case, you evalua
On 12/1/10 2:26 PM, YC wrote:
Hi all -
a question for those who have experiences with metacircular interpreters:
How do you represent the lexical variables? Since lexical variables can
be optimized away so they won't show up on a call to eval, it seems
putting them into the environment (I am u
Figured it out, thanks for all the help Matthias.
--- On Tue, 11/30/10, Matthias Felleisen wrote:
From: Matthias Felleisen
Subject: Re: [racket] Missionaries and cannibals
To: "Ken Hegeland"
Cc: us...@lists.racket-lang.org
Date: Tuesday, November 30, 2010, 11:12 PM
On Nov 30, 2010, at 4:09 P
On Wed, Dec 1, 2010 at 4:13 PM, Hendrik Boom wrote:
>
> I'm not sure I understand the question, though I suspect I may know the
> answer. Could you be a bit more specific?
>
Yes - definitely. See below.
> I'm not sure what you mean by "optimized away so they won't show up on a
> call to eval
Hi Eli,
> BTW, if you tried just that, then note that you can also an identifier
> to jump directly to its definition:
>
> (help lambda)
>
> This uses the *syntactic* information from the system, for example:
>
> (define kons cons)
> (help kons)
>
> won't work because `kons' is a new identif
And whoops I really really meant docs.racket-lang.org. :)
On Wed, Dec 1, 2010 at 7:31 PM, Greg Hendershott
wrote:
>> I wonder whether help could display contracts if the module use
>> provide/contract to export f.
>
> I like this idea.
>
> Maybe go a step further and allow per-parameter doc-stri
> I wonder whether help could display contracts if the module use
> provide/contract to export f.
I like this idea.
Maybe go a step further and allow per-parameter doc-string-ettes?
Because seeing
get-pure-port: (url? (listof string?) . -> . input-port?)
Might still be too opaque. "What is t
On Wed, Dec 01, 2010 at 11:26:07AM -0800, YC wrote:
> Hi all -
>
> a question for those who have experiences with metacircular interpreters:
>
> How do you represent the lexical variables? Since lexical variables can be
> optimized away so they won't show up on a call to eval, it seems putting
>
Two hours ago, richard.lawre...@berkeley.edu wrote:
>
> > On Dec 1, 2010, at 1:20 AM, Eli Barzilay wrote:
> >>
> >> This is because you didn't document it.
>
> Yes, right. This was perhaps not the best illustration. I don't
> think it would be terribly useful to read documentation (per se)
> ab
Thanks a lot to all of you for your hints and pointers to such interesting
information!
In fact for practical purposes, I will experiment with GPS first and see how
this works (from a first impression, the acceleration data from the phone seem
extremely "hyper-sensitive", so it might anyway tur
At Wed, 1 Dec 2010 21:20:29 +, Stephen De Gabrielle wrote:
> Am I the only one with problems with the keyboard shortcuts
> [apple]-'something' on OS-X
No, but I think it's fixed as of yesterday, so let me know if the
latest doesn't work for you.
___
Hi,
Am I the only one with problems with the keyboard shortcuts
[apple]-'something' on OS-X
Weirdly esc-l and esc-[space] are fine.
Cheers,
Stephen
--
--
Stephen De Gabrielle
stephen.degabrie...@acm.org
Telephone +44 (0)20 85670911
Mobile+44 (0)79 85189045
http://www.degabrielle.nam
Still not have solved it but I feel like I am getting close.
I developed a program that looks like this in step form
1. check if input is final, if it is return true, else
2.check if empty, if true return false(already thinking this isn't necassary
3. generate possible moves.
4. check if input has
Hi,
I'm getting an error when I try to use 'apply' on an inherited method:
colourwell.rkt:60:47: class: misuse of method (not in application) in: set
I feel I've missed something in my reading of the reference manual for apply
or inheriting methods, but I don't know where I've gone wrong?
I'm
Can you try the latest build?
It's v5.0.99.4 at http://pre.plt-scheme.org/installers/
I'm optimistic that this version will solve both the preference-panel
problem and the command-key problem that you're seeing.
_
For list-related administrative t
[Apologies if this gets mis-threaded; I'm switching between Gmane and the
mailing list address.]
> On Dec 1, 2010, at 1:20 AM, Eli Barzilay wrote:
>
>>>
>>> Examples: comparing Python's help function to Racket's as a tool for
>>> introspecting objects at the REPL
>>> [...]
(define (f x y)
>>>
>
> On Dec 1, 2010, at 1:20 AM, Eli Barzilay wrote:
>
>>>
>>> Examples: comparing Python's help function to Racket's as a tool for
>>> introspecting objects at the REPL
>>> [...]
(define (f x y)
>>>(+ x y))
(help f)
>>> Not found in any library's documentation: f
>>
>> This is because
Hi all -
a question for those who have experiences with metacircular interpreters:
How do you represent the lexical variables? Since lexical variables can be
optimized away so they won't show up on a call to eval, it seems putting
them into the environment (I am using a struct holding an immutab
On Nov 30, 2010, at 10:32 PM, Nadeem Abdul Hamid wrote:
> I think something like this has come up before but I can't find the
> thread. Given:
>
> (define A%
> (class object% (inspect #f) (super-new)))
> (define/contract B%
> (class/c )
> (class object% (inspect #f) (super-new)))
>
> How can I
On Dec 1, 2010, at 1:20 AM, Eli Barzilay wrote:
>>
>> Examples: comparing Python's help function to Racket's as a tool for
>> introspecting objects at the REPL
>> [...]
>>> (define (f x y)
>>(+ x y))
>>> (help f)
>> Not found in any library's documentation: f
>
> This is because you didn't
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