# Questions & Answers **URL:** https://racket.discourse.group/c/questions/6.md?page=7 [Latest](https://racket.discourse.group/latest.md) · [Categories](https://racket.discourse.group/categories.md) · [Tags](https://racket.discourse.group/tags.md) **Page:** 8 --- ## [Time and time-apply on windows 11 Pro](https://racket.discourse.group/t/time-and-time-apply-on-windows-11-pro/3333)
**Author:** [@joskoot](https://racket.discourse.group/u/joskoot)\ **Replies:** 3\ **Last updated:** [March 3, 2025, 12:14pm UTC](https://racket.discourse.group/t/time-and-time-apply-on-windows-11-pro/3333 "2025-03-03T12:14:42Z")
Possibly my question is not a problem of Racket, but as discourse is a very nice site, I ask my question first here. With windows 11 Pro on a 12th Gen Intel(R) Core(TM)i3-1215U processor, procedure time-apply and syntax… --- ## [Namespace-require can't find module in executable](https://racket.discourse.group/t/namespace-require-cant-find-module-in-executable/3592)
**Author:** [@Andy](https://racket.discourse.group/u/Andy)\ **Replies:** 4\ **Last updated:** [February 28, 2025, 2:07pm UTC](https://racket.discourse.group/t/namespace-require-cant-find-module-in-executable/3592 "2025-02-28T14:07:57Z")
Hello Racket community! I'm trying to use namespace-require, but the executable seems to fail to look up the module, while commandline racket can run it normally. This is the minimal example: test-pkg ├── lib.rkt └── t… --- ## [Behavioural differences in \`match\` for splicing/single pattern variables](https://racket.discourse.group/t/behavioural-differences-in-match-for-splicing-single-pattern-variables/3571)
**Author:** [@bakgatviooldoos](https://racket.discourse.group/u/bakgatviooldoos)\ **Replies:** 10\ **Last updated:** [February 27, 2025, 7:19pm UTC](https://racket.discourse.group/t/behavioural-differences-in-match-for-splicing-single-pattern-variables/3571 "2025-02-27T19:19:58Z")
Hi, Racket Discourse. Quick question: Why do these instances of the pattern variable A handle "equality" of A across the pattern differently? ;; the circles are printed \`exp\` structs and the squares are printed \`log\` s… --- ## [DrRacket - view toplevel definitions of actual file?](https://racket.discourse.group/t/drracket-view-toplevel-definitions-of-actual-file/3588)
**Author:** [@gekkonier](https://racket.discourse.group/u/gekkonier)\ **Replies:** 3\ **Last updated:** [February 26, 2025, 4:11pm UTC](https://racket.discourse.group/t/drracket-view-toplevel-definitions-of-actual-file/3588 "2025-02-26T16:11:27Z")
I really like the program contour beside the definitions. It helps me to quickly navigate around. It would be (for me) nice too if I could have a list of top-level definitions as list, where i can click the name of it … --- ## [Any way to convert .rkt file to HTML?](https://racket.discourse.group/t/any-way-to-convert-rkt-file-to-html/3460)
**Author:** [@ToddOBryan](https://racket.discourse.group/u/ToddOBryan)\ **Replies:** 10\ **Last updated:** [February 24, 2025, 10:58pm UTC](https://racket.discourse.group/t/any-way-to-convert-rkt-file-to-html/3460 "2025-02-24T22:58:48Z")
Is there a one-liner (or really simple) way to output a .rkt file as HTML for easy display, with snips, syntax highlighting, etc.? --- ## [Html generating: xml library reinterpreting &](https://racket.discourse.group/t/html-generating-xml-library-reinterpreting/3575)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 17\ **Last updated:** [February 24, 2025, 5:07pm UTC](https://racket.discourse.group/t/html-generating-xml-library-reinterpreting/3575 "2025-02-24T17:07:12Z")
Hello, just a little technical problem , i want to use greek letter for physic size and i'm using (require xml) i want to use ρ , instead of rho so i do: (regexp-replace #rx"rho" physic "\\\\ρ") but now i solved … --- ## [Code doesn't work, not surprised however it's yet another example from a book](https://racket.discourse.group/t/code-doesnt-work-not-surprised-however-its-yet-another-example-from-a-book/3568)
**Author:** [@munroec](https://racket.discourse.group/u/munroec)\ **Replies:** 5\ **Last updated:** [February 16, 2025, 3:08pm UTC](https://racket.discourse.group/t/code-doesnt-work-not-surprised-however-its-yet-another-example-from-a-book/3568 "2025-02-16T15:08:17Z")
Things were was executing ok until I added section that I have marked which was supposed to plot the the set union. I was very suspicious of the code that as the offending terms were never defined. Any thoughts on what i… --- ## [Implicit Form Bindings](https://racket.discourse.group/t/implicit-form-bindings/3567)
**Author:** [@YongaTechnic](https://racket.discourse.group/u/YongaTechnic)\ **Replies:** 1\ **Last updated:** [February 15, 2025, 12:33pm UTC](https://racket.discourse.group/t/implicit-form-bindings/3567 "2025-02-15T12:33:10Z")
Bindings like #%module-begin #%app #%datum #%top where are they defined, and is there a fulll list? Thanks --- ## [How to label axis in plot?](https://racket.discourse.group/t/how-to-label-axis-in-plot/3565)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 2\ **Last updated:** [February 14, 2025, 11:32am UTC](https://racket.discourse.group/t/how-to-label-axis-in-plot/3565 "2025-02-14T11:32:00Z")
hello, how to label x and y axis in plot? i want to add some units and physic name of plotted value but i only get x axis and y axis : i want instead to have for example t and rhoe or B. Also having a way to 'lin… --- ## [Is A Process Running?](https://racket.discourse.group/t/is-a-process-running/3548)
**Author:** [@OldDutchCap](https://racket.discourse.group/u/OldDutchCap)\ **Replies:** 6\ **Last updated:** [February 10, 2025, 7:48pm UTC](https://racket.discourse.group/t/is-a-process-running/3548 "2025-02-10T19:48:35Z")
Just curious--is there some way in Racket to check if a given binary is running or not? (subprocess? ) doesn't seem to find the process I'm looking for. I mean I check by process-id and I get false and I check by name… --- ## [Scope for Work on Racket -\> WASM?](https://racket.discourse.group/t/scope-for-work-on-racket-wasm/3556)
**Author:** [@divya](https://racket.discourse.group/u/divya)\ **Replies:** 4\ **Last updated:** [February 12, 2025, 8:23pm UTC](https://racket.discourse.group/t/scope-for-work-on-racket-wasm/3556 "2025-02-12T20:23:59Z")
I'd like to know where we are at with compiling Racket to WASM. I have been planning to contribute to Racket, and I believe this one is something I'd really like to help with. I know Adam Perlin has a Master's thesis on… --- ## [Threading and paralelism](https://racket.discourse.group/t/threading-and-paralelism/3563)
**Author:** [@GunpowderGuy](https://racket.discourse.group/u/GunpowderGuy)\ **Replies:** 2\ **Last updated:** [February 12, 2025, 6:20pm UTC](https://racket.discourse.group/t/threading-and-paralelism/3563 "2025-02-12T18:20:34Z")
Hello, I'm new to Racket, but I also use Idris2, which compiles to this language. Is there a more detailed explanation of Racket's parallelism beyond these resources? Racket Guide: Parallelism Racket Foreign Library: … --- ## [Setting bits in really wide numbers](https://racket.discourse.group/t/setting-bits-in-really-wide-numbers/3539)
**Author:** [@bakgatviooldoos](https://racket.discourse.group/u/bakgatviooldoos)\ **Replies:** 4\ **Last updated:** [February 11, 2025, 12:03pm UTC](https://racket.discourse.group/t/setting-bits-in-really-wide-numbers/3539 "2025-02-11T12:03:27Z")
Hi, Racket Discourse. Among other things, I am playing with a bloom-filter to try and validate UUIDs used in a database for a very numerous set of records. At first, I simply queried the DB whenever I needed to validat… --- ## [Cify & Schemify & Nanopass](https://racket.discourse.group/t/cify-schemify-nanopass/3552)
**Author:** [@YongaTechnic](https://racket.discourse.group/u/YongaTechnic)\ **Replies:** 3\ **Last updated:** [February 10, 2025, 11:53am UTC](https://racket.discourse.group/t/cify-schemify-nanopass/3552 "2025-02-10T11:53:32Z")
Hi fellows, I want to learn about City & Schemify and Nanopass. What is the best way to learn? Any suggestions? Thanks --- ## [Apply values to a procedure](https://racket.discourse.group/t/apply-values-to-a-procedure/3506)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 35\ **Last updated:** [February 6, 2025, 10:54pm UTC](https://racket.discourse.group/t/apply-values-to-a-procedure/3506 "2025-02-06T22:54:34Z")
Hello, I was in the need of applying a procedure to a result that return 3 values (x,y,z) to put this in a list. I know this works: (call-with-values (lambda () (values 1 2 3)) list) but i find it not pleasant to wea… --- ## [Prolog to Racklog - Trouble using %rel and %which](https://racket.discourse.group/t/prolog-to-racklog-trouble-using-rel-and-which/3544)
**Author:** [@lannydpittman](https://racket.discourse.group/u/lannydpittman)\ **Replies:** 1\ **Last updated:** [February 6, 2025, 4:30pm UTC](https://racket.discourse.group/t/prolog-to-racklog-trouble-using-rel-and-which/3544 "2025-02-06T16:30:01Z")
This problem has really stumped me. I don't understand the correct method to build a simple Prolog rule in Racklog, for example, pairing two people up by company: % Prolog (runs in SWISH) company(art ,apple). company(bo… --- ## [Getting all available submodules in a module](https://racket.discourse.group/t/getting-all-available-submodules-in-a-module/3542)
**Author:** [@nik](https://racket.discourse.group/u/nik)\ **Replies:** 4\ **Last updated:** [February 5, 2025, 11:46pm UTC](https://racket.discourse.group/t/getting-all-available-submodules-in-a-module/3542 "2025-02-05T23:46:47Z")
I have a module wherein I defined several submodules. Is there an easy way to get a list of all of the submodules? If I have the following file, example.rkt #lang racket/base (module one racket/base (provide doc) … --- ## [Transferring bindings between Rhombus and Racket](https://racket.discourse.group/t/transferring-bindings-between-rhombus-and-racket/3540)
**Author:** [@jamesgeddes](https://racket.discourse.group/u/jamesgeddes)\ **Replies:** 2\ **Last updated:** [February 4, 2025, 10:07pm UTC](https://racket.discourse.group/t/transferring-bindings-between-rhombus-and-racket/3540 "2025-02-04T22:07:30Z")
Is there documentation about how Rhombus values are represented when exported to Racket, and vice versa? (It may be that the correct answer here is to read the source, which I would be okay to hear.) The context is that… --- ## [Don’t understand the behavior of this code](https://racket.discourse.group/t/don-t-understand-the-behavior-of-this-code/3538)
**Author:** [@munroec](https://racket.discourse.group/u/munroec)\ **Replies:** 3\ **Last updated:** [February 4, 2025, 12:16pm UTC](https://racket.discourse.group/t/don-t-understand-the-behavior-of-this-code/3538 "2025-02-04T12:16:04Z")
This is an. example from “Racket Programming the Fun Way “ #lang racket (define queue% (class object% (init \[queue-list '()\]) (define head '{}) (define tail '{}) (super-new) (define/public (enqueue val) (let (\[t… --- ## [Proper way(s) to write to the output port in a console application?](https://racket.discourse.group/t/proper-way-s-to-write-to-the-output-port-in-a-console-application/3537)
**Author:** [@bakgatviooldoos](https://racket.discourse.group/u/bakgatviooldoos)\ **Replies:** 3\ **Last updated:** [February 3, 2025, 5:22pm UTC](https://racket.discourse.group/t/proper-way-s-to-write-to-the-output-port-in-a-console-application/3537 "2025-02-03T17:22:38Z")
Hi, Racket Discourse. I am busy fiddling around with a command-line script, and I am wondering what I am doing wrong with the "dynamic" display to the terminal's output. I am running on a kali linux instance, for what i… --- ## [\`match\` for parsing into hash](https://racket.discourse.group/t/match-for-parsing-into-hash/3523)
**Author:** [@dstorrs](https://racket.discourse.group/u/dstorrs)\ **Replies:** 2\ **Last updated:** [January 30, 2025, 5:35am UTC](https://racket.discourse.group/t/match-for-parsing-into-hash/3523 "2025-01-30T05:35:33Z")
\#lang racket (match (list 7 2 3 7) ; displays: 7 \[(list row b c row) row\]) (match (list 7 2 3 (hash 7 'ok )) ; displays: (list 7 'ok) … --- ## [EoPL Exercise 1.36](https://racket.discourse.group/t/eopl-exercise-1-36/3520)
**Author:** [@matteo-daddio](https://racket.discourse.group/u/matteo-daddio)\ **Replies:** 4\ **Last updated:** [January 27, 2025, 8:27pm UTC](https://racket.discourse.group/t/eopl-exercise-1-36/3520 "2025-01-27T20:27:02Z")
Hello, I’m reading EoPL and I’m stuck in the 1.36 exercise. Write a procedure g such that number-elements from page 23 could be defined as: (define number-elements (lambda (lst) (if (null? lst) ’() (g (lis… --- ## [Racket/gui list-box% vs choice% append](https://racket.discourse.group/t/racket-gui-list-box-vs-choice-append/3516)
**Author:** [@gekkonier](https://racket.discourse.group/u/gekkonier)\ **Replies:** 3\ **Last updated:** [January 26, 2025, 7:00pm UTC](https://racket.discourse.group/t/racket-gui-list-box-vs-choice-append/3516 "2025-01-26T19:00:44Z")
Hi! This is my first post, so I hope I don't violate something here. If this does not fit here I hope you tell me so I can adapt. I enjoy programming small tools with Racket, and I really like the easy to use gui Racke… --- ## [The use of #: in the program listing below](https://racket.discourse.group/t/the-use-of-in-the-program-listing-below/3505)
**Author:** [@munroec](https://racket.discourse.group/u/munroec)\ **Replies:** 12\ **Last updated:** [January 24, 2025, 3:02pm UTC](https://racket.discourse.group/t/the-use-of-in-the-program-listing-below/3505 "2025-01-24T15:02:25Z")
I'm less than a week into learning DrRacket and one of my books on Racket had a brief routine to plot 2 cycles of a sine wave. It didn't run as written in the book but it was fairly easy to get it to run in DrRacket how… --- ## [Audio support in Racket for music player](https://racket.discourse.group/t/audio-support-in-racket-for-music-player/3373)
**Author:** [@Robert](https://racket.discourse.group/u/Robert)\ **Replies:** 8\ **Last updated:** [January 23, 2025, 2:17am UTC](https://racket.discourse.group/t/audio-support-in-racket-for-music-player/3373 "2025-01-23T02:17:49Z")
I'm researching languages and libraries to make a music player. I'm considering Racket, but wonder if Racket has support for playing common audio files, or if there's an agreeable method to achieve the desired functional… --- ## [Imported syntax class works different from syntax class copy-pasted into file](https://racket.discourse.group/t/imported-syntax-class-works-different-from-syntax-class-copy-pasted-into-file/3507)
**Author:** [@sora22](https://racket.discourse.group/u/sora22)\ **Replies:** 4\ **Last updated:** [January 21, 2025, 9:21pm UTC](https://racket.discourse.group/t/imported-syntax-class-works-different-from-syntax-class-copy-pasted-into-file/3507 "2025-01-21T21:21:37Z")
I'm currently trying to reuse some syntax classes that I've made, and want to match certain identifiers within them. These syntax classes produce an error if I attempt to import them rather than defining them directly wi… --- ## [What does #:track-literals do?](https://racket.discourse.group/t/what-does-track-literals-do/3496)
**Author:** [@acarrico](https://racket.discourse.group/u/acarrico)\ **Replies:** 2\ **Last updated:** [January 16, 2025, 1:02pm UTC](https://racket.discourse.group/t/what-does-track-literals-do/3496 "2025-01-16T13:02:39Z")
What does #:track-literals do in syntax-parse? Why doesn't define-syntax-class also have #:track-literals? --- ## [Where is the "Check Syntax" button in DrRacket?](https://racket.discourse.group/t/where-is-the-check-syntax-button-in-drracket/3489)
**Author:** [@jsampson45](https://racket.discourse.group/u/jsampson45)\ **Replies:** 2\ **Last updated:** [January 14, 2025, 12:14pm UTC](https://racket.discourse.group/t/where-is-the-check-syntax-button-in-drracket/3489 "2025-01-14T12:14:10Z")
I cannot find the "Check Syntax" button mentioned in the docs. The interface to DrRacket that I see is: --- ## [Specifying other repos for packages to be included in \`make installers\`](https://racket.discourse.group/t/specifying-other-repos-for-packages-to-be-included-in-make-installers/3486)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 1\ **Last updated:** [January 13, 2025, 1:16pm UTC](https://racket.discourse.group/t/specifying-other-repos-for-packages-to-be-included-in-make-installers/3486 "2025-01-13T13:16:06Z")
Hi, I'm having fun making my own Racket, but I've come across a situation where I want to build against different repos to those in the package catalog. Is it possible to specify repos for the make installers sites.rkt… --- ## [Lifetime of sessions in \`net/http-easy\`](https://racket.discourse.group/t/lifetime-of-sessions-in-net-http-easy/3483)
**Author:** [@bakgatviooldoos](https://racket.discourse.group/u/bakgatviooldoos)\ **Replies:** 8\ **Last updated:** [January 12, 2025, 4:49pm UTC](https://racket.discourse.group/t/lifetime-of-sessions-in-net-http-easy/3483 "2025-01-12T16:49:37Z")
Hi, Racket Discourse. I encountered an API (specifically ThreatFox), which requires an SSL context for the session when making requests; I am using net/http-easy. Easy enough, after I figured that part out, but now I a… [Previous page](https://racket.discourse.group/c/questions/6.md?page=6) [Next page](https://racket.discourse.group/c/questions/6.md?page=8)