[racket-users] Re: [racket] Web Framework Benchmarks
A new version of these benchmarks was just published ("Round 19"):
https://www.techempower.com/benchmarks/#section=data-r19
Racket scores rather poorly (0 errors is nice, though). Anybody has any
guesses as to why this is? Racket performs well enough as far as I'm
concerned, and while I don't use the web server much, sounds unlikely that
it should be so far below django, for example. Maybe they run it in a
handicapped configuration or something.
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Re: [racket-users] Issue with define-type and typed classes
> I am thinking its deeper because the code sometimes compiles. > Yes, this happens with me too. I haven't tried it using raco but in DrRacket, while I was fiddling around with these classes, it would sometimes fail to compile, but I just used to erase what I wrote, and then re-write, and it would work. Once compiled it seemed to work fine. But I believe they're separate problems. I'll try to be more diligent about reporting issues with typed classes next time. I used to run into problems similar to what I reported in this thread previously, too, on whatever version of Racket was out a year or two ago, but I was throwing away and rewriting code quickly and it was hard to come up with minimal examples at the time. This one reproduced very reliably and I wasn't really making big changes so I was able to report easily. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/b3199035-27c9-4549-890d-0a4aac48d924%40googlegroups.com.
Re: [racket-users] "invalid memory reference" issue
I decided to build Racket CS from github and it works. Thanks! On Thursday, 5 March 2020 23:42:34 UTC+5, Matthew Flatt wrote: > > I've pushed a repair for the development version of Racket CS. The > problem was related to computing a hash code of an object (i.e., an > instance of a class). > > If you need a workaround to keep using the released version of Racket > CS, it may involve supplying explicit equality and hash-code functions > for your `Equal%` class. > > Thanks for the report! > > At Thu, 5 Mar 2020 04:07:48 -0800 (PST), hashim muqtadir wrote: > > Hello, > > > > I have some code that uses my library, "remap". It previously used to > work, > > but in Racket CS 7.6, it fails saying "invalid memory reference. Some > > debugging context lost". > > Clicking the crosses in DrRacket gives this backtrace: > > > > invalid memory reference. Some debugging context lost > > > > /home/hashim/racket/collects/racket/private/for.rkt: 2020:10 > > (hash-set table key val > > > > /home/hashim/racket/collects/racket/private/for.rkt: 1503:16 > > (let-values ([(fold-var ...) (let () expr1 expr ...)]) > > (values fold-var ...)] > > > > /home/hashim/racket/collects/racket/private/for.rkt: 1543:38 > > #'(let-values ([(fold-var ...) > > (for/foldX/derived > > [orig-stx inner-recur nested? #f ()] > > ([fold-var > fold-var] > > ...) > > next-k break-k > > final?-id > > rest expr1 . > body)]) > > (if (and post-guard ... (not > > final?-id)) > > (for-loop fold-var ... > loop-arg > > ... ...) > > next-k))) > > > > My tests, that use the library functions, seem to work, but for some > reason > > when I'm building a hash from my structures. > > The file found > > > https://gitlab.com/hashimmm/remap/-/blob/96f1db518c4d9bb8f2da44ae403ab50332212c > > > 9c/issue.rkt > > is present in the "issue" branch in my repo and running this file in > > DrRacket will reproduce the problem. > > > > From the file, removing the measurement-units table definition and its > > references fixes the problem (the memory error then no longer occurs). > > > > Any ideas what's up with this? I'd be happy to provide more information > to > > narrow this down, but I'm not really sure how. > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to racket...@googlegroups.com . > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/racket-users/afec7b07-7f96-4d7f-ac59-8eb54446 > > > 2709%40googlegroups.com. > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/839ec6d6-8c55-4a94-8090-09255d56a9c2%40googlegroups.com.
[racket-users] "invalid memory reference" issue
Hello, I have some code that uses my library, "remap". It previously used to work, but in Racket CS 7.6, it fails saying "invalid memory reference. Some debugging context lost". Clicking the crosses in DrRacket gives this backtrace: invalid memory reference. Some debugging context lost /home/hashim/racket/collects/racket/private/for.rkt: 2020:10 (hash-set table key val /home/hashim/racket/collects/racket/private/for.rkt: 1503:16 (let-values ([(fold-var ...) (let () expr1 expr ...)]) (values fold-var ...)] /home/hashim/racket/collects/racket/private/for.rkt: 1543:38 #'(let-values ([(fold-var ...) (for/foldX/derived [orig-stx inner-recur nested? #f ()] ([fold-var fold-var] ...) next-k break-k final?-id rest expr1 . body)]) (if (and post-guard ... (not final?-id)) (for-loop fold-var ... loop-arg ... ...) next-k))) My tests, that use the library functions, seem to work, but for some reason when I'm building a hash from my structures. The file found https://gitlab.com/hashimmm/remap/-/blob/96f1db518c4d9bb8f2da44ae403ab50332212c9c/issue.rkt is present in the "issue" branch in my repo and running this file in DrRacket will reproduce the problem. >From the file, removing the measurement-units table definition and its references fixes the problem (the memory error then no longer occurs). Any ideas what's up with this? I'd be happy to provide more information to narrow this down, but I'm not really sure how. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/afec7b07-7f96-4d7f-ac59-8eb544462709%40googlegroups.com.
[racket-users] Issue with define-type and typed classes
So I have this file, found here: https://gitlab.com/hashimmm/remap/-/blob/3682db9fff3bc5007833e07bf9a9ed6e8e0170a9/private/tables.rkt Lines 51 through 55 say: (define-type (Func<%> A) (BaseFunc<%> A FuncAnyParam))(define-type BoolFunc<%> (Func<%> BooleanColumn))(define-type AnyFunc<%> (Func<%> ColIdent)) And this used to work on older versions of racket, say Racket BC 7.4 But on Racket CS 7.6, I get an error on this line: (define-type AnyFunc<%> (Func<%> ColIdent)) Even though (a) it doesn't throw an error on the line before it, and (b) replacing it with (define-type AnyFunc<%> (BaseFunc<%> ColIdent FuncAnyParam)) works. I thought the way define-type works is that (Func<%> ColIdent) would expand into (BaseFunc<%> ColIdent FuncAnyParam) I've had similar problems with define-type previously where I'd think it would just expand by substituting the parameter but it doesn't seem to really do that. I don't have any trivial example to show, though. Fiddling around eventually gets it to work. I'd really appreciate some help as to how to think about what define-type does in my head. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/8d04a193-58b2-4b49-8e23-642f115f401b%40googlegroups.com.
Re: [racket-users] Generics: delegate to a parent
> I am trying to make good use of Generic Interfaces, but can't figure out if its at all possible to delegate calls up the struct inheritance chain. So, something like `call-next` If I understand you correctly, "define/generic" let you do this. See https://docs.racket-lang.org/reference/struct-generics.html?q=generic#%28form._%28%28lib._racket%2Fgeneric..rkt%29._define%2Fgeneric%29%29 > or even better maybe there's a way to do explicit dispatch? So something like having two structs: If your structs don't inherit from each other, and no configuration of "fallback" or "default" options does what you want, a slightly different approach compared to extracting fish's implementation and reusing it is to use "define/generic" to get the existing "generic" function in your new struct's definition, and have a function convert a marlin to a fish, and then pass that over to the generic function. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Re: [racket] Typed racket and keywords
> as what I was trying to do was produce a typed version of Greg Hendershott's "keyword structs" ( https://www.greghendershott.com/2015/07/keyword-structs-revisited.html ) Sorry, I pointed to the wrong thing. The procedure I was re-implementing was hash->struct/kw from https://github.com/dstorrs/racket-dstorrs-libs/blob/master/struct.rkt -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Re: [racket] Typed racket and keywords
I found this topic when searching around for something about keyword-apply and typed racket, as what I was trying to do was produce a typed version of Greg Hendershott's "keyword structs" (https://www.greghendershott.com/2015/07/keyword-structs-revisited.html ) and I was getting an error saying there's no such thing as keyword-apply. So I suppose there isn't. Let's add that info in the "Caveats and Limitations" part of the guide. Or maybe mention this in the part of the reference that says typed/racket reprovides everything that racket has. Or, maybe it's now easier to add it in? I wish there were a guide to contributing to typed racket, though I fear I might be missing a lot of prerequisite knowledge even if there were one. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Why would a value produced by eval-ing code not satisfy its type predicate? (Particularly, a SQL statement from the sql package)
> The issue you're encountering with namespaces is analogous, because each namespace gets its own instances of modules. This is a feature! Imagine, for example, that you are trying to run students' programs in a sandbox. If namespaces shared module instances, a malicious or buggy student program could alter mutable state and affect other students' programs or your outside-the-sandbox program. But this means that two different namespaces will have two distinct instances of the `sql` module that export two distinct `sql-statement?` predicates, each recognizing only its own version of the sql-statement struct type: this is effectively the same situation as calling `thing1?` on `a-thing2` in my example. > For times when you really do want to share a module instance, Racket provides `namespace-attach-module`. Alternatively, you could just use `define-namespace-anchor` and `namespace-anchor->namespace`. Thanks! That both explains and resolves the issue. In my original example, if I replace the beginning part with: #lang racket (require db) (require sql) (define sql-namespace (make-base-empty-namespace)) (define src-namespace (current-namespace)) (parameterize ([current-namespace sql-namespace]) (namespace-attach-module src-namespace 'sql) (namespace-require 'sql)) Then everything works as expected, and now I know why. > But, as others have said, you really don't want to use `eval`. (If you aren't already familiar with the issues, see [...] Point taken. At the time I just wanted the variable-columns thing working and I hadn't figured out how to make it work with a list. Additionally, escaping column names isn't going to be an issue, because most likely in the actual use case the user's required column list will pass through a whitelist. That part's solved, one way or another. > As long as you at least know the schema you're working with, you could even generate select statements for all possible sets of columns at compile time, and then just choose the right statement dynamically with a runtime function. That did occur to me, and was my other idea compared to eval, up until I'd figured out the INJECT thing, but I didn't do it as then there would be a huge amount of select statements. The idea was to basically take the column list, sort it, string-join, and then get the relevant select from a hash table. But there'd be way too many. As to why I would like to do this, well, basically at my workplace we sort of make web applications, generally split into a separate server side application that's basically an HTTP API, that different browser and mobile applications talk to. I've previously always written the server side part in python. "Sort of" because have to work offline too. One of the problems we face is of moving too much data around. Mobile applications that have to mainly work offline and periodically sync, they have to move around lots of data on horrible connections. (We do gzip and all. Choosing a data format that's not json is an option I'll evaluate in the future.) So selecting a list of fields when getting data for different entites is something we provide in our APIs. In the beginning we did in fact return all of an entity's data. as writing different column sets for different clients, while do-able, is sort of bad in the sense that then when somebody asks for adding a column in a table in the mobile app, it required changes in two places, and needlessly adds code. The idea being that when we only write a different column set (and call it a different entity) on the same enttiy when it's a non trivial thing to do. So anyway while most of this is solved for the current few projects we have, we're moving away from python. Racket's an experiment, partly chosen because we agree with the "many languages" approach. Things like python's django, sqlalchemy and javascript's vue aren't libraries, they're #langs. So now I have to write solutions/languages in Racket to make sure we're at least on par with what we have at the moment. Like in python we have our little filters language, which piggybacks on django ORM's column and relation lookup syntax, but we restrict some operations and add some others, nest them in and/or/not operators, and generically handle edge cases that django doesn't (like ensuring that joins don't increase row count). And no, writing SQL in the client application is not (yet) an option as we need to evaluate certain things first. Evaluated graphQL, a bit, tentatively, and alone, it doesn't to fit the use case. A hybrid approach seems do-able in the short term but a bad idea in the long term. Anyway, thanks for the help. and I suppose I should mark this thread as solved (I don't know what that really does). I don't mind people asking things, but I suppose littering the list with specifics would be frowned upon. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To
Re: [racket-users] Why would a value produced by eval-ing code not satisfy its type predicate? (Particularly, a SQL statement from the sql package)
> Good news, limit and distinct are in scope for v0.2 - I'm working on it now :) That's good to hear, thanks! I'll be sure to check it out, and let you know if I have any ideas/requirements for features or if I can contribute. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Why would a value produced by eval-ing code not satisfy its type predicate? (Particularly, a SQL statement from the sql package)
> No. Look back at your code ... you defined the struct in your own > unnamed module just before the definition of "select/f" But the thing is, the error was that it failed to recognize sql-statement in the test, which is provided by sql, not me. The function otherwise worked correctly. The thing returned by the function wasn't recognized as an sql-statement. It had the same printed representation as a call to "select" done manually. > This is a late stage debugging version with a lot > of visible output - cleaned up a bit, the final version is part of a > scheduler I wrote. You are free to do with it whatever you like Thanks! Seems pretty neat. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] Why would a value produced by eval-ing code not satisfy its type predicate? (Particularly, a SQL statement from the sql package)
> If order to use a struct across namespaces, the module that > defines the struct must be required into each namespace that uses the > struct. Yes, I suspect there's some weird interaction between namespaces too, hence the topic, but that's still pretty vague. After all, the thing defining the structs is the sql package, and my modules/namespaces are importing that. > Eval almost always is the wrong answer. I wanted to pass a list to select, but select is a macro, and I didn't get how to define a macro on top of that to do what I wanted, since the macro doesn't know that one of the things being passed into it evaluates to a list, so it can't splice that list into select, hence, eval. > And thanks, Ryan, for racket-izing SQL! Maybe I can stop stapling together all of those long horrible strings now. Yes, I was quite pleasantly surprised at how comprehensive this library is! I was thinking "surely it wouldn't support arrays as they're not standard" but nope, they're covered too :) > I recommend that you take a look at section 3.7 of the documentation, "Dynamic Statement Composition and SQL Injection”, which I believe does exactly what you want. Specifically, you want to dynamically construct a select statement. I did look at that. And up until yesterday I thought "this isn't helping, I need to inject multiple select-expr's!". And today, I had a look again and thought, hey, what if I use a string that has a comma in it, and, hey, that works! i.e. the following works: #lang racket (require sql) (select (ScalarExpr:INJECT (unquote "mew, two")) #:from pokemon) It gives me `(sql-statement "SELECT mew, two FROM pokemon")` So now I know all I have to do is comma-join my list to form a string, and inject that. What I do _not_ know if that's how INJECT was meant to be used, or whether I should build a separate inject macro that uses unquote-splice instead that comma-joins the list and does some form of escaping on the columns. My first guess is that properly verifying the items in the list to be single expressions is pretty difficult, so it sounds like a bad idea, and since one select-expr is allowed to yield multiple columns (because the "db" library that will actually get the results doesn't need any info from the query, I think), my approach should be fine. As an aside, I really like python's sqlalchemy library. It makes composing sql really easy. But I think sqlalchemy would complain if a single expression yielded multiple results on the wire. Is that coupling between query and result a good thing or bad? It seems to have its pros and cons, but right now I'm depending on the lack of coupling, so that's cool on "sql"'s part. But anyway in sqlalchemy it's just all functions. In this one, it's all macros, and I'm a bit slow with Racket, trying to compose macros trips me up a bit. So I guess my goal's reachable (I should now be able to insert a list of columns into a select using a function, without needing eval or namespaces). Thanks, all, for the input. I do wish to find out how to get around the predicate thing and why it's throwing an error, in case anyone knows. PS There's also a racket package called plisqin which seemed closer to what I was looking for. Maybe in a few months or so if it clicks I'll see if I can add to that package everything I need (things like limit and distinct) and it might work out. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Why would a value produced by eval-ing code not satisfy its type predicate? (Particularly, a SQL statement from the sql package)
Hello, The test in my following code raises an error saying that when I call select/f, the result doesn't satisfy `sql-statement?`. I've no idea why, the only vague idea I have is that it may have something to do with the fact that it was essentially eval'd in a separate namespace. Any ideas? #lang racket (require db) (define sql-namespace (make-base-empty-namespace)) (parameterize ([current-namespace sql-namespace]) (namespace-require 'sql sql-namespace)) (struct Select-spec (tbl ;; symbol col-exprs ;; listof symbols limit ;; number order-by)) ;; listof select symbols (define (select/f sel-spec) (eval `(select ,@(Select-spec-col-exprs sel-spec) #:from ,(Select-spec-tbl sel-spec) ,@(let ([lim (Select-spec-limit sel-spec)] [order (Select-spec-order-by sel-spec)]) (if lim `(#:limit ,lim #:order-by ,@order) '( sql-namespace)) (module+ test (require sql) (require rackunit) (check-equal? (sql-statement->string (select/f (Select-spec 'd '(a b c) 10 '(a b (sql-statement->string (select a b c #:from d #:order-by a b #:limit 10 (provide select/f Select-spec) My main reason for doing this was that the statement-producing macros provided by the sql package were, well, macros, so I couldn't pass in a list of columns and get a statement. What I want to do is have a struct like the one I made in this snippet, and use functions to include/exclude columns, before finally passing it off to a function that produces the statement. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Possible Typed Racket bugs (regarding, separately, for/fold and occurrence typing)
Hello,
The example in the documentation for using #:result with for/fold, here:
https://docs.racket-lang.org/reference/for.html?q=for%2Ffold#%28form._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._for%2Ffold%29%29
works in normal racket, but not typed racket.
I suppose that isn't really a bug, but something simply left out, and a
user can simply implement the macro themselves?
Additionally, regarding occurrence typing:
This works:
> (for ([x (in-list '("123" "432" "234"))])
(define num (string->number x))
(unless num
(error "Not a number"))
(display (format "~s" (* num 2
246864468
But this doesn't typecheck:
> (for ([x (in-list '("123" "432" "234"))])
(define num (string->number x))
(unless num
(error "Not a number"))
(define double (* num 2))
(display (format "~s" double)))
. Type Checker: type mismatch
expected: Number
given: (U Complex False) in: num
Am I missing something here?
I'm running the code in DrRacket, using v7.1.
Regards,
Hashim.
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Re: [racket-users] Re: What is the best way to daemonize a Racket program on linux?
I've found monit to work alongside systemd services pretty neatly. As in, I have monit monitoring my web server, which is running using systemd, and monit sends me emails if it's not working or something. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] DrRacket Font Selection
I have the same problem on Fedora 27, Racket 6.11. I don't recall the last time I tried changing fonts so I'm not sure when it happened. I do distinctly remember font selection used to work once upon a time. And the same workaround works for me, too. As in, if I just use the scroll wheel on that menu and press Enter, and open it up again, more fonts show up. And I tried that code snippet; for me, too, only "a" appears, not "b" and "c". -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: FW: [racket-users] Can't seem to find the blue box(es) in DrRacket anymore
Thank you! On Aug 28, 2017 4:21 AM, "Robby Findler" <ro...@eecs.northwestern.edu> wrote: > I've pushed a fix. Sorry for the delay in looking into this. > > https://github.com/racket/drracket/issues/118 > > Robby > > > On Sun, Aug 27, 2017 at 12:06 PM, Jos Koot <jos.k...@gmail.com> wrote: > > Sorry, ignore my post. > > Jos Koot > > > > -Original Message- > > From: Jos Koot [mailto:jos.k...@gmail.com] > > Sent: domingo, 27 de agosto de 2017 19:00 > > To: 'hashim muqtadir'; 'Racket Users' > > Subject: RE: [racket-users] Can't seem to find the blue box(es) in > DrRacket anymore > > > > I think you can toggle a switch in tab 'background expansion' of the > preferences menu. > > Jos > > > > -Original Message- > > From: racket-users@googlegroups.com [mailto:racket-users@ > googlegroups.com] On Behalf Of hashim muqtadir > > Sent: domingo, 27 de agosto de 2017 8:12 > > To: Racket Users > > Subject: [racket-users] Can't seem to find the blue box(es) in DrRacket > anymore > > > > Hello, > > I recently updated to Racket 6.10 and I cannot seem to find the blue > boxes in the top right of the definitions and interactions > > windows anymore. They don't show up by pressing the hotkey (f2) either. > There's no error or anything, just nothing happens. External > > help works, i.e. pressing f1 opens up the docs search in my browser. > > > > snip > > > > -- > > You received this message because you are subscribed to the Google > Groups "Racket Users" group. > > To unsubscribe from this group and stop receiving emails from it, send > an email to racket-users+unsubscr...@googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Can't seem to find the blue box(es) in DrRacket anymore
Hello, I recently updated to Racket 6.10 and I cannot seem to find the blue boxes in the top right of the definitions and interactions windows anymore. They don't show up by pressing the hotkey (f2) either. There's no error or anything, just nothing happens. External help works, i.e. pressing f1 opens up the docs search in my browser. Other things I did around the same time the blue boxes disappeared were tinkering with the preferences a bit and 'raco pkg migrate 6.9'. But I didn't find any relevant preference that turns them off (there was something about blue boxes and background expansion but turning that on/off doesn't help) and it did not seem to me that the migrate command would have messed anything up. Anyone has any idea what might have happened? I'd like those back. Maybe I'm just missing some preference or something. I'm using a 64-bit Windows 10, in case that is relevant. Regards, Hashim. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Re: (sixth RacketCon) videos up.
Thanks! -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] #lang video
Thanks, everyone, good to know that not only will we be getting the videos soon but that we have a new #lang for them as well. Maybe next RacketCon Leif will be giving a talk on #lang video :) -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Any information on whether/when Sixth RacketCon videos will be available?
The videos for the live streams are available on youtube but they aren't as clear audio/video-wise as the individual talks videos are for older RacketCons are. The website does say they will be made available; I just hope that plan did not get scrapped, did it? -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] mode-lambda example doesn't work?
I seem to be facing a different issue though it fits into the same topic; i.e. the example mentioned in the docs does not work for me. Anyway when I try to run the example, I get the following output: $ racket -l mode-lambda/examples/one You can press these keys: r - show random sprites, notice that some of them are static g - show sprits in a grid b - show a pretty scene t - show a single sprite tiled around w - show a few sprites wrapped around a torus x - show some text s - turn on/off spinning for b mode Look at my source code! You are using OpenGL (4 1) Log of shader(4): 0:123(10): error: sampler arrays indexed with non-constant expressions are forbidden in GLSL 1.30 and later Exiting... I'm using racket version 6.5. The mode-lambda package was installed using raco. Maybe I'm missing something obvious, I don't know. I have no idea how to work with sprites and graphics and all. I was just curious to see what this package does. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
