# Latest **URL:** https://racket.discourse.group/latest.md?page=33 [Latest](https://racket.discourse.group/latest.md) · [Categories](https://racket.discourse.group/categories.md) · [Tags](https://racket.discourse.group/tags.md) **Page:** 34 --- ## [Scribble/manual: period after closing curly bracket gives problem](https://racket.discourse.group/t/scribble-manual-period-after-closing-curly-bracket-gives-problem/2725)
**Author:** [@joskoot](https://racket.discourse.group/u/joskoot)\ **Replies:** 5\ **Last updated:** [February 17, 2024, 2:45am UTC](https://racket.discourse.group/t/scribble-manual-period-after-closing-curly-bracket-gives-problem/2725 "2024-02-17T02:45:47Z")
\#lang scribble/manual @tt{a} . @;ok (mark the space before the period) @tt{a}. @;wrong\\ The wrong line works well when running the scrbl file locally, but installing from github with the package manager of DrRacket … --- ## [Procesor simulation in SICP](https://racket.discourse.group/t/procesor-simulation-in-sicp/2723)
**Author:** [@joskoot](https://racket.discourse.group/u/joskoot)\ **Replies:** 0\ **Last updated:** [February 15, 2024, 9:14pm UTC](https://racket.discourse.group/t/procesor-simulation-in-sicp/2723 "2024-02-15T21:14:39Z")
May be I have not read all, but it seems to me that the processor simulation described in SICP does not deal with the limited size of words (in registers and memory). I hope that I am wrong, but please tell me if yes or … --- ## [Vector-add function not available](https://racket.discourse.group/t/vector-add-function-not-available/2722)
**Author:** [@rvdalen](https://racket.discourse.group/u/rvdalen)\ **Replies:** 4\ **Last updated:** [February 15, 2024, 11:28am UTC](https://racket.discourse.group/t/vector-add-function-not-available/2722 "2024-02-15T11:28:49Z")
I want to add a single element at the end of a vector, but I cannot find a function like vector-add. I am assuming that is because it acts as a deterrent not to try and do this. Coming from a Clojure environment I am u… --- ## [Raco pkg install error: certificate verify failed](https://racket.discourse.group/t/raco-pkg-install-error-certificate-verify-failed/2717)
**Author:** [@Axel](https://racket.discourse.group/u/Axel)\ **Replies:** 7\ **Last updated:** [February 14, 2024, 10:08pm UTC](https://racket.discourse.group/t/raco-pkg-install-error-certificate-verify-failed/2717 "2024-02-14T22:08:20Z")
Hello, thank for the new version of Racket. I just managed to compile this new version and encountered a problem as I tried to install some packages via the package manager in drracket but that attempt failed. Than I … --- ## [Racket setup probrem on Windows](https://racket.discourse.group/t/racket-setup-probrem-on-windows/2714)
**Author:** [@atsushifx](https://racket.discourse.group/u/atsushifx)\ **Replies:** 1\ **Last updated:** [February 13, 2024, 2:02am UTC](https://racket.discourse.group/t/racket-setup-probrem-on-windows/2714 "2024-02-13T02:02:56Z")
I install Racket on Windows 11 and set Environment "PLTUSERHOME" and "PLTADDONDIR" for "XDG Base Directory" PLTUSERHOME = "C:\\Users\\atsushifx.config" PLTADDONDIR = "C:\\Users\\atsushifx.local\\share/Racket/addon" I want … --- ## [Racket v8.12 is now available](https://racket.discourse.group/t/racket-v8-12-is-now-available/2709)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 0\ **Last updated:** [February 10, 2024, 8:00am UTC](https://racket.discourse.group/t/racket-v8-12-is-now-available/2709 "2024-02-10T08:00:11Z")
Racket v8.12 is now available We are pleased to announce Racket v8.12 is now available from https://download.racket-lang.org/ As of this release: The "Die Macht der Abstraktion" language levels are no longer prese… --- ## [Racket server that controls some other components](https://racket.discourse.group/t/racket-server-that-controls-some-other-components/2707)
**Author:** [@Jerry\_A](https://racket.discourse.group/u/Jerry_A)\ **Replies:** 1\ **Last updated:** [February 7, 2024, 12:51pm UTC](https://racket.discourse.group/t/racket-server-that-controls-some-other-components/2707 "2024-02-07T12:51:47Z")
Hey everyone! I'm trying to create a simple website that would allow to control an Arduino light system with HTTP requests. For starters, I want to control a few lights with Arduino. Arduino is programmed to read the HTT… --- ## [Docker container for Racket for architectures other than x86](https://racket.discourse.group/t/docker-container-for-racket-for-architectures-other-than-x86/2705)
**Author:** [@awiersdorf](https://racket.discourse.group/u/awiersdorf)\ **Replies:** 1\ **Last updated:** [February 7, 2024, 12:27am UTC](https://racket.discourse.group/t/docker-container-for-racket-for-architectures-other-than-x86/2705 "2024-02-07T00:27:51Z")
I'd like to use Racket in a Docker container, but I have an M1 machine, and the Rosetta emulation is having trouble running x86 images. I note that whenever I download Racket (e.g. via docker run -it racket/racket:latest)… --- ## [Turning a list into values](https://racket.discourse.group/t/turning-a-list-into-values/2694)
**Author:** [@markshead](https://racket.discourse.group/u/markshead)\ **Replies:** 4\ **Last updated:** [February 6, 2024, 4:19am UTC](https://racket.discourse.group/t/turning-a-list-into-values/2694 "2024-02-06T04:19:53Z")
Is there a way to turn a list into values. So something like the magic function in this example: (define-values (name age) (magic '("Bob" 25))) --- ## [Putting a large pict in a text%: scroll bar problems](https://racket.discourse.group/t/putting-a-large-pict-in-a-text-scroll-bar-problems/2700)
**Author:** [@benknoble](https://racket.discourse.group/u/benknoble)\ **Replies:** 8\ **Last updated:** [February 6, 2024, 12:50am UTC](https://racket.discourse.group/t/putting-a-large-pict-in-a-text-scroll-bar-problems/2700 "2024-02-06T00:50:12Z")
To reproduce: raco pkg install https://github.com/benknoble/frosthaven-manager#rich-text-protocol racket -l frosthaven-manager/t (t for "test example" or some such) I get an explained pict and then a GUI Easy-bui… --- ## [Draft of 8.12 release notes](https://racket.discourse.group/t/draft-of-8-12-release-notes/2692)
**Author:** [@jbclements](https://racket.discourse.group/u/jbclements)\ **Replies:** 18\ **Last updated:** [February 4, 2024, 5:53am UTC](https://racket.discourse.group/t/draft-of-8-12-release-notes/2692 "2024-02-04T05:53:59Z")
Here's a first draft of the release notes for version 8.12. Please let me know about edits you'd like to make, missing information, and other important things! Racket automatically sets the close-on-exec flag when open… --- ## [Racket meet-up: Saturday, 3 February, 2024 at 18:00 UTC](https://racket.discourse.group/t/racket-meet-up-saturday-3-february-2024-at-18-00-utc/2689)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 1\ **Last updated:** [February 4, 2024, 12:52am UTC](https://racket.discourse.group/t/racket-meet-up-saturday-3-february-2024-at-18-00-utc/2689 "2024-02-04T00:52:11Z")
Racket meet-up: Saturday, 3 February, 2024 at 18:00 UTC In your timezone: 2024-02-03T18:00:00Z (UTC). (converter) At this meet-up: Show and tell News & rumours AOB This meet-up will be held at https://meet.jit.si/Rac… --- ## [Import a r6rs library from another r6rs library in the same directory?](https://racket.discourse.group/t/import-a-r6rs-library-from-another-r6rs-library-in-the-same-directory/2691)
**Author:** [@awwx](https://racket.discourse.group/u/awwx)\ **Replies:** 0\ **Last updated:** [January 30, 2024, 10:02pm UTC](https://racket.discourse.group/t/import-a-r6rs-library-from-another-r6rs-library-in-the-same-directory/2691 "2024-01-30T22:02:30Z")
I can easily require a r6rs library file in the same directory from a Racket program: a1.rkt: #lang racket (require "b2.rkt") (foo) a2.rkt: #!r6rs (library (a2) (export foo) (import (rnrs)) (define (foo) … --- ## [Is the access time of a growable vector constant?](https://racket.discourse.group/t/is-the-access-time-of-a-growable-vector-constant/2690)
**Author:** [@leoflotor](https://racket.discourse.group/u/leoflotor)\ **Replies:** 1\ **Last updated:** [January 30, 2024, 11:00am UTC](https://racket.discourse.group/t/is-the-access-time-of-a-growable-vector-constant/2690 "2024-01-30T11:00:00Z")
Hi all! I was using growable vectors, gvector, for some projects and I didn't find if the accessing time for this data structure is constant or not. Does anyone know about it? For example, in the docs of list-ref do sp… --- ## [In the htdp book, how much leeway do we have with adjusting the templates?](https://racket.discourse.group/t/in-the-htdp-book-how-much-leeway-do-we-have-with-adjusting-the-templates/2683)
**Author:** [@candleconch](https://racket.discourse.group/u/candleconch)\ **Replies:** 6\ **Last updated:** [January 29, 2024, 7:08pm UTC](https://racket.discourse.group/t/in-the-htdp-book-how-much-leeway-do-we-have-with-adjusting-the-templates/2683 "2024-01-29T19:08:00Z")
Hi, everyone. First time posting here. A novice in programming. So I have this question which I've posted on stackoverflow - you can read the long version of it here: https://stackoverflow.com/q/77874527/22037671 One … --- ## [Best way to use Racket for app development?](https://racket.discourse.group/t/best-way-to-use-racket-for-app-development/2688)
**Author:** [@dstorrs](https://racket.discourse.group/u/dstorrs)\ **Replies:** 3\ **Last updated:** [January 29, 2024, 7:07pm UTC](https://racket.discourse.group/t/best-way-to-use-racket-for-app-development/2688 "2024-01-29T19:07:35Z")
I'd like to develop apps for the Google store (Android) and/or the Apple store (iOS). What is the best way to do that? I'm aware of GitHub - jeapostrophe/racket-android: deploying Racket on Android and some options for… --- ## [Realm of Racket, chapter 2](https://racket.discourse.group/t/realm-of-racket-chapter-2/2679)
**Author:** [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Replies:** 2\ **Last updated:** [January 25, 2024, 4:12pm UTC](https://racket.discourse.group/t/realm-of-racket-chapter-2/2679 "2024-01-25T16:12:22Z")
Hello. In order to make a better version of the Program "Guess my number", I have begun to splitt the program into two parts, as you see here: As you see, I have to define someway the "variables" variable. Is thi… --- ## [Racket on Exercism for #48in24](https://racket.discourse.group/t/racket-on-exercism-for-48in24/2675)
**Author:** [@BNAndras](https://racket.discourse.group/u/BNAndras)\ **Replies:** 0\ **Last updated:** [January 21, 2024, 3:18am UTC](https://racket.discourse.group/t/racket-on-exercism-for-48in24/2675 "2024-01-21T03:18:16Z")
Hello, everyone. For the last few months, I've been maintaining the Racket language track at Exercism.org. Exercism features a series of coding exercises across 67 language tracks including optional code review, all free… --- ## [Qi Accelerated - Qi 4 release announcement](https://racket.discourse.group/t/qi-accelerated-qi-4-release-announcement/2672)
**Author:** [@countvajhula](https://racket.discourse.group/u/countvajhula)\ **Replies:** 0\ **Last updated:** [January 18, 2024, 10:28pm UTC](https://racket.discourse.group/t/qi-accelerated-qi-4-release-announcement/2672 "2024-01-18T22:28:21Z")
Qi Accelerated - Qi 4 release announcement Qi is a functional, flow-oriented language that's simple, expressive and easy to embed anywhere in Racket programs. And now, it's also blazing fast! Friends, It gives me g… --- ## [Testing for the v8.12 release](https://racket.discourse.group/t/testing-for-the-v8-12-release/2673)
**Author:** [@jbclements](https://racket.discourse.group/u/jbclements)\ **Replies:** 0\ **Last updated:** [January 18, 2024, 10:41pm UTC](https://racket.discourse.group/t/testing-for-the-v8-12-release/2673 "2024-01-18T22:41:42Z")
Testing for the v8.12 release (using the v8.11.900 release candidate build) Search for your name on the checklist page to find relevant items, either reply when you finish an item (please indicate which item/s is/are … --- ## [\`raco pkg install\` from behind proxy](https://racket.discourse.group/t/raco-pkg-install-from-behind-proxy/681)
**Author:** [@ogennadi](https://racket.discourse.group/u/ogennadi)\ **Replies:** 3\ **Last updated:** [January 18, 2024, 12:35pm UTC](https://racket.discourse.group/t/raco-pkg-install-from-behind-proxy/681 "2024-01-18T12:35:59Z")
Hi all, I installed Racket on my work machine. When I run raco pkg install I get the following error even though my HTTP\_PROXY and HTTPS\_PROXY env variables are set. How can I get around this? C:\\Users\\n945186\>raco pkg … --- ## [Racket for Hydroper Jet?](https://racket.discourse.group/t/racket-for-hydroper-jet/2667)
**Author:** [@matheus](https://racket.discourse.group/u/matheus)\ **Replies:** 2\ **Last updated:** [January 15, 2024, 5:55pm UTC](https://racket.discourse.group/t/racket-for-hydroper-jet/2667 "2024-01-15T17:55:11Z")
I've spent a little time formulating compilation units for the Hydroper Jet Language using the Rust language. However, I'm not sure whether it's worthy continuing ahead to build a handwritten parser. What I want to do i… --- ## [Racket Discourse Chat changes (January 2024)](https://racket.discourse.group/t/racket-discourse-chat-changes-january-2024/2665)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 0\ **Last updated:** [January 15, 2024, 10:14am UTC](https://racket.discourse.group/t/racket-discourse-chat-changes-january-2024/2665 "2024-01-15T10:14:18Z")
I normally don’t share changes that we get automatically, and I have no intention too do this again, , but given the popularity of chat elsewhere (IRC,Slack, Discord) I thought it worth sharing here: Easier access to c… --- ## [Double instantiation of modules from namespace-require in executable](https://racket.discourse.group/t/double-instantiation-of-modules-from-namespace-require-in-executable/2662)
**Author:** [@mthom](https://racket.discourse.group/u/mthom)\ **Replies:** 2\ **Last updated:** [January 13, 2024, 5:56pm UTC](https://racket.discourse.group/t/double-instantiation-of-modules-from-namespace-require-in-executable/2662 "2024-01-13T17:56:17Z")
After compiling my Racket application to an executable with raco, I'm finding that namespace-require re-instantiates several modules. Consequently, the namespace I'm trying to load into has its contents split across two … --- ## [Heads up: Qi 4 Release Incoming](https://racket.discourse.group/t/heads-up-qi-4-release-incoming/2604)
**Author:** [@countvajhula](https://racket.discourse.group/u/countvajhula)\ **Replies:** 3\ **Last updated:** [January 11, 2024, 9:38pm UTC](https://racket.discourse.group/t/heads-up-qi-4-release-incoming/2604 "2024-01-11T21:38:44Z")
After more than a year of contributions, work on the Qi compiler is getting close to release (targeted for next week)! And we would love your help with testing it, especially against existing codebases making use of Qi. … --- ## [Looking for a tutor](https://racket.discourse.group/t/looking-for-a-tutor/2656)
**Author:** [@Shasvi](https://racket.discourse.group/u/Shasvi)\ **Replies:** 4\ **Last updated:** [January 11, 2024, 10:54am UTC](https://racket.discourse.group/t/looking-for-a-tutor/2656 "2024-01-11T10:54:52Z")
I have an exam on DrRacket, but I'm not understanding nothing. Can someone help me, please? I have past paper with solutions thanks --- ## [How to use map-of, fun, local, lambda?](https://racket.discourse.group/t/how-to-use-map-of-fun-local-lambda/2659)
**Author:** [@Shasvi](https://racket.discourse.group/u/Shasvi)\ **Replies:** 0\ **Last updated:** [January 10, 2024, 5:43pm UTC](https://racket.discourse.group/t/how-to-use-map-of-fun-local-lambda/2659 "2024-01-10T17:43:21Z")
How to use map-of, fun, local, lambda? --- ## [RFC: hash table pattern matching](https://racket.discourse.group/t/rfc-hash-table-pattern-matching/1686)
**Author:** [@sorawee](https://racket.discourse.group/u/sorawee)\ **Replies:** 68\ **Last updated:** [January 10, 2024, 12:24pm UTC](https://racket.discourse.group/t/rfc-hash-table-pattern-matching/1686 "2024-01-10T12:24:54Z")
The current hash-table pattern for match is problematic. It is buggy and inefficient. We would like to deprecate the hash-table pattern and create a new pattern that does a better job. A preliminary discussion is in mat… --- ## [Where to start with optimizing Racket programs?](https://racket.discourse.group/t/where-to-start-with-optimizing-racket-programs/2634)
**Author:** [@nikhilm](https://racket.discourse.group/u/nikhilm)\ **Replies:** 25\ **Last updated:** [January 9, 2024, 8:41pm UTC](https://racket.discourse.group/t/where-to-start-with-optimizing-racket-programs/2634 "2024-01-09T20:41:47Z")
Given a plain racket program like #lang racket/base (require racket/generator racket/unsafe/ops) (define (gen-primes-upto n) (generator () (if (= n 2) (void) (… --- ## [Possible acmart.cls update needed, for language scribble/acmart](https://racket.discourse.group/t/possible-acmart-cls-update-needed-for-language-scribble-acmart/2648)
**Author:** [@encomer](https://racket.discourse.group/u/encomer)\ **Replies:** 2\ **Last updated:** [January 9, 2024, 5:08pm UTC](https://racket.discourse.group/t/possible-acmart-cls-update-needed-for-language-scribble-acmart/2648 "2024-01-09T17:08:35Z")
When using the scribble/acmart language (for PDF output), an error is reported in the interaction window, saying that the hyperref package needs to be before the hyperxmp package. The error is solved when changing the r… [Previous page](https://racket.discourse.group/latest.md?page=32) [Next page](https://racket.discourse.group/latest.md?page=34)