Hello. I am exploring some physics ideas and I was thinking about making some
3D simulations to flesh out some of my ideas and to demonstrate them to others.
Are there any polished packages for doing 3d stuff in racket? I looked just
briefly a while back and didn’t have much luck. I think I foun
Thanks, George. This helped a lot.
On Wed, Apr 7, 2021 at 9:03 PM George Neuner wrote:
>
>
> On 4/7/2021 5:34 PM, David Storrs wrote:
> > I'm trying to expand a task manager to optionally use places and I'm
> > having some trouble understanding the issue.
> >
> > ; test.rkt
> > #lang racket
> >
I think "define/contract" protects a function from other incorrect calls
from the same module. So your "define/provide/contract" is not really
"define/contract" + "provide". Here is an example illustrating the
problem, where the call to "bar" correctly reports the contract violation,
but the
On 4/7/2021 5:34 PM, David Storrs wrote:
I'm trying to expand a task manager to optionally use places and I'm
having some trouble understanding the issue.
; test.rkt
#lang racket
(provide start)
(define (start thnk)
(sync (place ch (place-channel-put ch (thnk)
; x.rkt
#lang racket
(r
The idea is that a contract violation is not merely telling you "oh,
someone said that you should get an integer? here and you didn't." That is
what an assert macro might do. But contracts offer more.
Contracts are also giving you information to help you hone in on where the
error actually is in y
Clueless newb here. Wait, why can't we have both? As a joe programmer
on the street I would want the blame to be on b.rkt, and also on any
function calling f() incorrectly from inside a.rkt. Reading this
thread it sounds to me like that's not easily available?
On Wed, Apr 7, 2021 at 4:22 PM Robby
No, I don't think it is a bad move if that's your goal! (I usually work at
the file-level granularity but different code calls for different things.)
I inferred from epi's message that that wasn't what was going on (perhaps
incorrectly).
Robby
On Wed, Apr 7, 2021 at 4:37 PM David Storrs wrote:
At Wed, 7 Apr 2021 14:08:00 -0700 (PDT), Dexter Lagan wrote:
> One last thing, I noticed that a small window appears top-left corner of
> the screen before the full DrRacket window opens since 8.0.0.1x :
That window's full title turns out to be "Recompiling quickscripts...".
It's shown and hidden
On Tue, Apr 6, 2021 at 7:54 PM Matthew Flatt wrote:
> In the cross-compilation path that the release builds use, there was an
> unintended layer of compression. (I noticed the size difference before,
> but had not yet investigated.) Checking that again, if the extra layer
> is used, the 10% or so
I've always liked define/contract because it guarantees the safety of
the function from erroneous calls by other functions in the module,
which helps with debugging and testing. It sounds like you think
that's a bad move?
On Wed, Apr 7, 2021 at 4:35 PM Robby Findler wrote:
>
> The short answer:
I'm trying to expand a task manager to optionally use places and I'm
having some trouble understanding the issue.
; test.rkt
#lang racket
(provide start)
(define (start thnk)
(sync (place ch (place-channel-put ch (thnk)
; x.rkt
#lang racket
(require "test.rkt")
(start (thunk 'ok))
Result
Also, I caught a seg-fault yesterday, after having left a DrRacket 7.9 BC
open for a couple of days on a basic servlet. I'll see if happens again
with 8.0.0.x while I use it.
Dex
On Wednesday, April 7, 2021 at 11:08:00 PM UTC+2 Dexter Lagan wrote:
> I updated window.rkt, and it fixed the s
I updated window.rkt, and it fixed the scrolling problem. It's exactly as
it was with 7.9. Thanks!
One last thing, I noticed that a small window appears top-left corner of
the screen before the full DrRacket window opens since 8.0.0.1x :
[image: small-window.PNG]
I had trouble capturing it, a
It is worth noting that it is relatively easy to implement a
define/provide/contract syntax without any problems. In my two most
active projects I use it extensively. In one case even with
scribble/srcdoc to keep the contracts, scribblings and implementation in
one place.
The simplest version:
(d
The short answer: you probably should use (provide (contract-out))
instead of define/contract.
The slightly longer answer: when you write a contract, you are not just
describing what the legal inputs and outputs are, you are also establishing
a *boundary* between two regions of code. In the ca
Hello Racket users,
I am trying to understand a contract violation message that I am getting.
Here is the file a.rkt:
#lang racket
(provide f)
(define/contract (f a)
(-> boolean? any/c)
'())
and this is b.rkt:
#lang racket
(require "a.rkt")
(f 3)
I would ex
Hello,
I'm trying to write a side condition to a function, where it checks if a is
in an environment ß. I tried this judgement by adding (judgment-holds
(anotin (ß-v ...) a #f)) at the end of the function but it is not working :(
Thank you!
--Beatriz
(define-judgment-form Flint
#:mode (anotin
I am new to Racket and I am trying to get an update on probabilistic
programming in Racket.
Both *drbayes* and *gamble *seem to have gone many years without an update
and when I do a *raco pkg install *they both show errors. I think gamble's
errors are mostly just documentation at the moment,
Thanks for the info, I'll try updating window.rkt and report back.
What surprises me is that scrolling by keeping the mouse button down
while hovering on the scrollbar is fast and smooth, while using a
two-finger gesture is erratic and choppy (on top of the direction-change
delay). I wonder if
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