# Latest **URL:** https://racket.discourse.group/latest.md?page=51 [Latest](https://racket.discourse.group/latest.md) · [Categories](https://racket.discourse.group/categories.md) · [Tags](https://racket.discourse.group/tags.md) **Page:** 52 --- ## [(Windows) Update PATH as part of install?](https://racket.discourse.group/t/windows-update-path-as-part-of-install/1526)
**Author:** [@joeld](https://racket.discourse.group/u/joeld)\ **Replies:** 4\ **Last updated:** [December 7, 2022, 7:56pm UTC](https://racket.discourse.group/t/windows-update-path-as-part-of-install/1526 "2022-12-07T19:56:54Z")
Would it ever be possible to have the Windows installer update the system PATH variable to include the Racket program folder? (And, ideally, remove it again on uninstall.) This is the only really unfriendly part of setti… --- ## [ChatGPT knows a ton about Racket apparently](https://racket.discourse.group/t/chatgpt-knows-a-ton-about-racket-apparently/1539)
**Author:** [@slaymaker1907](https://racket.discourse.group/u/slaymaker1907)\ **Replies:** 4\ **Last updated:** [December 7, 2022, 2:55pm UTC](https://racket.discourse.group/t/chatgpt-knows-a-ton-about-racket-apparently/1539 "2022-12-07T14:55:06Z")
I asked it "Implement the Bakery algorithm in the Racket programming language." AND IT ACTUALLY WORKED! I haven't reviewed the code in detail for bugs, but it's incredible that it managed to do anything at all. #lang ra… --- ## [Pipes in Symbols](https://racket.discourse.group/t/pipes-in-symbols/1540)
**Author:** [@greg](https://racket.discourse.group/u/greg)\ **Replies:** 4\ **Last updated:** [December 7, 2022, 2:53pm UTC](https://racket.discourse.group/t/pipes-in-symbols/1540 "2022-12-07T14:53:22Z")
The pipe sign (|) is sometimes used to enclose symbols. Is there more information about when one might want or need to do this? The only example I could come up with is the empty symbol ('||) which as far as I can tell c… --- ## [Turtle graphics](https://racket.discourse.group/t/turtle-graphics/1523)
**Author:** [@Lambda17](https://racket.discourse.group/u/Lambda17)\ **Replies:** 11\ **Last updated:** [December 5, 2022, 3:32pm UTC](https://racket.discourse.group/t/turtle-graphics/1523 "2022-12-05T15:32:07Z")
Hi. Sorry, I am a complete beginner on programming and racket, but keen to learn and help my son learn at the same time. I am interested in combining turtle graphics with 2htdp/image and 2htdp/universe. Any clues how to … --- ## [Separating webserver/app code and site templates](https://racket.discourse.group/t/separating-webserver-app-code-and-site-templates/1529)
**Author:** [@steveivy](https://racket.discourse.group/u/steveivy)\ **Replies:** 5\ **Last updated:** [December 5, 2022, 12:01am UTC](https://racket.discourse.group/t/separating-webserver-app-code-and-site-templates/1529 "2022-12-05T00:01:40Z")
\[Background - I'm porting my golang blog app to racket, and figuring it out as I go\] I've been working through the web-server-lib docs and learning to use include-template. In my existing app, the installation of the bl… --- ## [A Blog About Cool Racket-y Stuff](https://racket.discourse.group/t/a-blog-about-cool-racket-y-stuff/1470)
**Author:** [@quasarbright](https://racket.discourse.group/u/quasarbright)\ **Replies:** 14\ **Last updated:** [December 4, 2022, 9:32pm UTC](https://racket.discourse.group/t/a-blog-about-cool-racket-y-stuff/1470 "2022-12-04T21:32:56Z")
I hope this is the right place for this. I started a blog about Racket-y stuff that I find interesting, written in scribble of course. It's focused on Racket and Racket-adjacent concepts and projects. Here it is Right… --- ## [Racket meet-up Saturday 3 December at 18:00 UTC :racket:](https://racket.discourse.group/t/racket-meet-up-saturday-3-december-at-18-00-utc/1460)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 4\ **Last updated:** [December 4, 2022, 3:22pm UTC](https://racket.discourse.group/t/racket-meet-up-saturday-3-december-at-18-00-utc/1460 "2022-12-04T15:22:14Z")
Racket meet-up Saturday 3 December at 18:00 UTC :racket: At this meet-up: Show and tell News & rumours AOB Meet-up time at your location: 2022-12-03T18:00:00Z (UTC) (Discourse should convert this for you) In the 'Rac… --- ## [Matching regexp in case statement?](https://racket.discourse.group/t/matching-regexp-in-case-statement/1525)
**Author:** [@steveivy](https://racket.discourse.group/u/steveivy)\ **Replies:** 6\ **Last updated:** [December 2, 2022, 6:46pm UTC](https://racket.discourse.group/t/matching-regexp-in-case-statement/1525 "2022-12-02T18:46:49Z")
Hello, As per usual, I'm learning racket by implementing pieces of my blog software over. I have 20+ years of blog posts (and tweets, over 11k in total) that have been migrated over to Markdown at various points, which … --- ## [ACM access to A Programmable Programming Language](https://racket.discourse.group/t/acm-access-to-a-programmable-programming-language/1515)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 3\ **Last updated:** [November 28, 2022, 6:55pm UTC](https://racket.discourse.group/t/acm-access-to-a-programmable-programming-language/1515 "2022-11-28T18:55:34Z")
Hi, I’ve noticed that the full text of the article is not available from the acm. I thought it was OA, but must have got it wrong. Is the copy posted by Shriram correct? Best Stephen https://cs.brown.edu/~sk/Public… --- ## [Reply limit in the mailing list mode?](https://racket.discourse.group/t/reply-limit-in-the-mailing-list-mode/1506)
**Author:** [@sorawee](https://racket.discourse.group/u/sorawee)\ **Replies:** 1\ **Last updated:** [November 28, 2022, 3:17pm UTC](https://racket.discourse.group/t/reply-limit-in-the-mailing-list-mode/1506 "2022-11-28T15:17:41Z")
I got this after replying to an old thread via the mailing list mode. Email issue -- You are trying to reply to an old notification We're sorry, but your email message to didn't work. We only accept replies to origi… --- ## [Racketfest 2023: The little Racket conference that could!](https://racket.discourse.group/t/racketfest-2023-the-little-racket-conference-that-could/1516)
**Author:** [@jesse](https://racket.discourse.group/u/jesse)\ **Replies:** 0\ **Last updated:** [November 28, 2022, 1:04pm UTC](https://racket.discourse.group/t/racketfest-2023-the-little-racket-conference-that-could/1516 "2022-11-28T13:04:35Z")
Racketfest, the rogue Racket conference, is on! Mark your calendars: Saturday, March 18, 2023 in Berlin, Germany. All the information you need is on the Racketfest homepage. That page contains all information, and will … --- ## [How to evaluate a single expression?](https://racket.discourse.group/t/how-to-evaluate-a-single-expression/1511)
**Author:** [@ceving](https://racket.discourse.group/u/ceving)\ **Replies:** 5\ **Last updated:** [November 28, 2022, 7:19am UTC](https://racket.discourse.group/t/how-to-evaluate-a-single-expression/1511 "2022-11-28T07:19:06Z")
I am looking for the equivalent of C-x C-e in Emacs' Scheme mode. In Emacs the function eval-last-sexp gets evaluated. If you put the cursor on a closing parenthesis, the code up to the corresponding opening parenthesis … --- ## [Advent of Code 2022 Racket Leaderboard](https://racket.discourse.group/t/advent-of-code-2022-racket-leaderboard/1461)
**Author:** [@SamPhillips](https://racket.discourse.group/u/SamPhillips)\ **Replies:** 1\ **Last updated:** [November 27, 2022, 1:28pm UTC](https://racket.discourse.group/t/advent-of-code-2022-racket-leaderboard/1461 "2022-11-27T13:28:33Z")
It's time again for the Advent of Code. The puzzles will start at midnight (UTC-5) on December 1, 2022. Once again, we will have the Racket leaderboard. Use the join code 22197-a7a01707 to be included. Any language i… --- ## [Raco test with errortrace](https://racket.discourse.group/t/raco-test-with-errortrace/1505)
**Author:** [@tehkonst](https://racket.discourse.group/u/tehkonst)\ **Replies:** 2\ **Last updated:** [November 23, 2022, 3:42am UTC](https://racket.discourse.group/t/raco-test-with-errortrace/1505 "2022-11-23T03:42:47Z")
In docs: 13 raco test: Run tests , a flag --errortrace is mentioned. --errortrace — Dynamically loads errortrace before running the tests. Note that already-compiled files will not include the tracing information. Bu… --- ## [Syntax-case via defmacro](https://racket.discourse.group/t/syntax-case-via-defmacro/1502)
**Author:** [@ben\_greenman](https://racket.discourse.group/u/ben_greenman)\ **Replies:** 1\ **Last updated:** [November 21, 2022, 8:36pm UTC](https://racket.discourse.group/t/syntax-case-via-defmacro/1502 "2022-11-21T20:36:32Z")
Does anyone know where to find an implementation of syntax-case or syntax-rules in Common Lisp, using just defmacro ? --- ## [Real Racket applications with correct idiomatic style?](https://racket.discourse.group/t/real-racket-applications-with-correct-idiomatic-style/1504)
**Author:** [@maueroats](https://racket.discourse.group/u/maueroats)\ **Replies:** 7\ **Last updated:** [November 20, 2022, 9:22pm UTC](https://racket.discourse.group/t/real-racket-applications-with-correct-idiomatic-style/1504 "2022-11-20T21:22:57Z")
Recently on Discord there was a question about "real applications written in Racket". There were a number of thought-provoking answers which I will add here to keep them accessible and searchable. I am not the author of… --- ## [Pyffi - Use Python from Racket](https://racket.discourse.group/t/pyffi-use-python-from-racket/1362)
**Author:** [@soegaard](https://racket.discourse.group/u/soegaard)\ **Replies:** 35\ **Last updated:** [November 19, 2022, 8:40am UTC](https://racket.discourse.group/t/pyffi-use-python-from-racket/1362 "2022-11-19T08:40:52Z")
Hi All, For a while I have been hacking on using Python/Python libraries from Racket. The library is now so advanced, that it makes sense to present it here. The purpose is simple: make it easy to use Python libraries… --- ## [Racket package online seems not to rebuild my package](https://racket.discourse.group/t/racket-package-online-seems-not-to-rebuild-my-package/1500)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 6\ **Last updated:** [November 19, 2022, 3:03am UTC](https://racket.discourse.group/t/racket-package-online-seems-not-to-rebuild-my-package/1500 "2022-11-19T03:03:34Z")
hello, my last rebuil is 2 days ago, one was sheduled this morning (european time) but no news? is it normal? best regards, damien --- ## [Adding a new \`raco\` command - path configuration](https://racket.discourse.group/t/adding-a-new-raco-command-path-configuration/1488)
**Author:** [@soegaard](https://racket.discourse.group/u/soegaard)\ **Replies:** 2\ **Last updated:** [November 17, 2022, 9:22pm UTC](https://racket.discourse.group/t/adding-a-new-raco-command-path-configuration/1488 "2022-11-17T21:22:55Z")
Hi All, In an attempt to make the Racket package pyffi easier to configure, I added a raco command, so users can write raco pyffi configure to start a configuration tool. Now, I have tested this on my own machine and … --- ## [I need help with this exercise in DrRacket](https://racket.discourse.group/t/i-need-help-with-this-exercise-in-drracket/1494)
**Author:** [@CelsoBorges360](https://racket.discourse.group/u/CelsoBorges360)\ **Replies:** 2\ **Last updated:** [November 17, 2022, 9:02pm UTC](https://racket.discourse.group/t/i-need-help-with-this-exercise-in-drracket/1494 "2022-11-17T21:02:31Z")
Hello, I'm trying to solve this exercise but I can't Consider the recurrence relation: Write a tail recursive function that calculate the nth term of the sequence, with the starting initials: 𝑎0 = 𝑎1 = 1 for examp… --- ## [Can someone help me with this exercise in DrRacket?](https://racket.discourse.group/t/can-someone-help-me-with-this-exercise-in-drracket/1495)
**Author:** [@JohanVenegas](https://racket.discourse.group/u/JohanVenegas)\ **Replies:** 2\ **Last updated:** [November 17, 2022, 9:01pm UTC](https://racket.discourse.group/t/can-someone-help-me-with-this-exercise-in-drracket/1495 "2022-11-17T21:01:30Z")
--- ## [Twelfth RacketCon video playlist](https://racket.discourse.group/t/twelfth-racketcon-video-playlist/1481)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 1\ **Last updated:** [November 17, 2022, 1:20pm UTC](https://racket.discourse.group/t/twelfth-racketcon-video-playlist/1481 "2022-11-17T13:20:12Z")
The RacketCon recording have been cut up into individual talks and uploaded to the Racket YouTube channel. The can be found in the Twelfth RacketCon Playlist All playlists: https://www.youtube.com/c/racketlang/playlist… --- ## [Identifier already required?](https://racket.discourse.group/t/identifier-already-required/1480)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 4\ **Last updated:** [November 17, 2022, 11:22am UTC](https://racket.discourse.group/t/identifier-already-required/1480 "2022-11-17T11:22:06Z")
hello, i have this strange message when trying to redefine a 'if like in the file below. Welcome to DrRacket, version 8.6 \[cs\]. Language: reader "racket/SRFI-105.rkt", with debugging; memory limit: 14000 MB. . racket… --- ## [I need help with my homework](https://racket.discourse.group/t/i-need-help-with-my-homework/1484)
**Author:** [@federico3](https://racket.discourse.group/u/federico3)\ **Replies:** 3\ **Last updated:** [November 17, 2022, 9:12am UTC](https://racket.discourse.group/t/i-need-help-with-my-homework/1484 "2022-11-17T09:12:00Z")
A Pythagorean triplet is a set of three natural numbers, a \< b \< c, for which: a^2 + b^2 = c^2. For example: 3^2+4^2=9+16=25=5^2. There exists exactly one Pythagorean triplet for which a + b + c = 1000. Find the produc… --- ## [I have a problem with my homework](https://racket.discourse.group/t/i-have-a-problem-with-my-homework/1483)
**Author:** [@federico3](https://racket.discourse.group/u/federico3)\ **Replies:** 1\ **Last updated:** [November 17, 2022, 6:47am UTC](https://racket.discourse.group/t/i-have-a-problem-with-my-homework/1483 "2022-11-17T06:47:24Z")
I need a function that receives two arrays of numeric values: one of dimensions m × n and one of dimensions n × p and calculates the multiplication of both arrays. For example: --- ## [Questions on quoting](https://racket.discourse.group/t/questions-on-quoting/1472)
**Author:** [@sschwarzer](https://racket.discourse.group/u/sschwarzer)\ **Replies:** 14\ **Last updated:** [November 17, 2022, 6:25am UTC](https://racket.discourse.group/t/questions-on-quoting/1472 "2022-11-17T06:25:22Z")
Disclaimer: The following questions are not relevant for any code I'm working on, but I'm curious about any answers, since I'm still wondering about these questions despite telling me repeatedly they're not important. … --- ## [Racket v8.7 Release Thread](https://racket.discourse.group/t/racket-v8-7-release-thread/1343)
**Author:** [@jbclements](https://racket.discourse.group/u/jbclements)\ **Replies:** 32\ **Last updated:** [November 15, 2022, 6:22pm UTC](https://racket.discourse.group/t/racket-v8-7-release-thread/1343 "2022-11-15T18:22:29Z")
The release process for v8.7 will begin in about a week. If you have any new features that you want in and are relatively close to to being done, now is a good time to do that. Upcoming dates: - 7th: Branch day, merge… --- ## [Mutable hash sets in typed Racket](https://racket.discourse.group/t/mutable-hash-sets-in-typed-racket/1452)
**Author:** [@hendrikboom3](https://racket.discourse.group/u/hendrikboom3)\ **Replies:** 0\ **Last updated:** [November 11, 2022, 3:22pm UTC](https://racket.discourse.group/t/mutable-hash-sets-in-typed-racket/1452 "2022-11-11T15:22:55Z")
Mutable sets seem to be in Racket. However, in typed Racket, the Setof type constructor's description explicitly rejects mutable sets. And the regular Racket operation mutable-seteq seems to be unavailable. Is this tr… --- ## [Metapict questions on filling polygons from points](https://racket.discourse.group/t/metapict-questions-on-filling-polygons-from-points/1449)
**Author:** [@pmatos](https://racket.discourse.group/u/pmatos)\ **Replies:** 4\ **Last updated:** [November 10, 2022, 10:34am UTC](https://racket.discourse.group/t/metapict-questions-on-filling-polygons-from-points/1449 "2022-11-10T10:34:45Z")
I am trying to draw something in metapict and I am having trouble simplifying code. Lets say I have 2 rectangles side by side, roughly: A B C x------------x------------x | | … --- ## [Syntactic test suite coverage in Dr Racket](https://racket.discourse.group/t/syntactic-test-suite-coverage-in-dr-racket/1421)
**Author:** [@tehkonst](https://racket.discourse.group/u/tehkonst)\ **Replies:** 7\ **Last updated:** [November 10, 2022, 2:06am UTC](https://racket.discourse.group/t/syntactic-test-suite-coverage-in-dr-racket/1421 "2022-11-10T02:06:20Z")
Hi. I am trying to use drracket's syntactic test suite coverage. It always marks expressions in functions with optional arguments (see the screenshot). Can I make drracket test coverage to ignore these lines? [Previous page](https://racket.discourse.group/latest.md?page=50) [Next page](https://racket.discourse.group/latest.md?page=52)