On Thursday, 25 May 2017 23:44:58 UTC+10, David K. Storrs wrote:
> This isn't smooth, but it works:
>
> #lang at-exp racket
> (first (regexp-match @pregexp{\d+\.\d{0,4}} "15.123456789"))
> (first (regexp-match @pregexp{\d+\.\d{0,4}} "15.12"))
>
Thank you - that is certainly more complicated than
I'm looking to make a structure editor for racket code, with an eye to perhaps
eventually integrating it into the DrRacket IDE.
I haven't used Racket/Draw or Racket/GUI before and I'm currently evaluating
their suitability for the task. In general, I'm eager for relatively simple
Racket/GUI exa
The client module can refer to all imported #% forms. If you don’t export it
from the language module, it’s not there. [Well, mostly] Implicitly the client
module already refers to #% forms already.
> On May 25, 2017, at 7:09 PM, Vityou wrote:
>
> On Wednesday, May 24, 2017 at 2:05:23 PM U
> On May 25, 2017, at 3:49 PM, Matthew Flatt wrote:
>
> At Thu, 25 May 2017 18:28:16 -0400, "'John Clements' via Racket Users" wrote:
>>> On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
>>> Immutable hash operations are logarithmic, not constant time.
>>
>> I believe our documentation says th
On Wednesday, May 24, 2017 at 2:05:23 PM UTC-6, Matthias Felleisen wrote:
> Don’t eval. This is a bit crude but it now your lam-s keep track of your
> environment, too.
>
> #lang racket ;; new-lang.rkt
>
> (provide
> #%app
> #%datum
> #%top-interaction
> (rename-out
> (new-lambda lambda)
At Thu, 25 May 2017 18:28:16 -0400, "'John Clements' via Racket Users" wrote:
> > On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
> > Immutable hash operations are logarithmic, not constant time.
>
> I believe our documentation says they’re “effectively constant-time”.
FWIW, there's a margin n
Well, that's because the log of the largest possible hash table is
like, what, less than 100?
Robby
On Thu, May 25, 2017 at 5:28 PM, 'John Clements' via Racket Users
wrote:
>
>> On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
>>
>> On Thu, May 25, 2017 at 6:16 PM, 'John Clements' via Racket U
> On May 25, 2017, at 3:27 PM, Jon Zeppieri wrote:
>
> On Thu, May 25, 2017 at 6:16 PM, 'John Clements' via Racket Users
> wrote:
>> Following up on a discussion I had with another teacher here, I decided to
>> briefly investigate the running time of insertion and deletion on mutable vs
>> im
On Thu, May 25, 2017 at 6:16 PM, 'John Clements' via Racket Users
wrote:
> Following up on a discussion I had with another teacher here, I decided to
> briefly investigate the running time of insertion and deletion on mutable vs
> immutable hash tables. I was a bit disappointed to find that it t
> On May 25, 2017, at 3:20 PM, Ben Greenman wrote:
>
> Is the y-axis on the first plot labeled correctly? It's reporting fractions
> of a millisecond, but the text talks about 7 vs. 40 seconds.
Yes, I believe that’s correct: the 7 seconds is for constructing the table of
10 million elements,
Is the y-axis on the first plot labeled correctly? It's reporting fractions
of a millisecond, but the text talks about 7 vs. 40 seconds.
Also the timings links aren't working for me:
https://www.brinckerhoff.org/img/hash-table-timings.rkt
https://www.brinckerhoff.org/img/hash-table-lookup-timings.
Following up on a discussion I had with another teacher here, I decided to
briefly investigate the running time of insertion and deletion on mutable vs
immutable hash tables. I was a bit disappointed to find that it turns out that
insertion really doesn’t look very constant-time for insertion… o
> On May 25, 2017, at 1:16 PM, David Storrs wrote:
>
> 1) What can I do with a thread descriptor?
The section on Threads in the reference[1] includes all sorts of
functions that operate on thread descriptors, including but not
limited to thread-suspend, thread-resume, kill-thread, break-thread,
Two questions:
1) What can I do with a thread descriptor?
2) Is there a way to get the thread descriptor from inside the thread?
There's no documentation that I can find on what a thread descriptor
actually is or what can be done with it. It's an opaque structure...I
guess I can use it for eq?
Vityou,
I will give you an example though I myself sometimes doubt that I did it in the
right way.
Anyway, here is what I did when I had exactly the same problem:
- redefine and reexport #% top-interaction
- provide #:language-info to the DrRacket's REPL (I am not sure if racket's
REPL needs
This isn't smooth, but it works:
#lang at-exp racket
(first (regexp-match @pregexp{\d+\.\d{0,4}} "15.123456789"))
(first (regexp-match @pregexp{\d+\.\d{0,4}} "15.12"))
On Thu, May 25, 2017 at 7:59 AM, Alasdair McAndrew wrote:
> In (standard) Racket, I can display a real number x to (say) 4 dec
In (standard) Racket, I can display a real number x to (say) 4 decimal places
using something like
(displayln (string->number (real->decimal-string x 4)))
This is handy for printing out multiple versions of a list or vector of real
numbers, and seeing how they change.
I would like to do the sa
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