#racket on 2020-04-25 — irc logs at freenode.irclog.whitequark.org

2020-02-20 18:27 samth changed the topic of #racket to: Racket v7.6 has been released: https://blog.racket-lang.org/2020/02/racket-v7-6.html -- Racket -- https://racket-lang.org -- https://pkgs.racket-lang.org -- Paste at http://pasterack.org

00:00 <friscosam> samth: re: parameterize, of course that makes sense rereading it

00:02 <friscosam> I find command-line to be annoyingly imperative. I'd prefer an interface like parse-command-line : Command-Spec -> Arguments -> Queryable-Value

00:03 <friscosam> This might be my Python argparse bias showing

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07:06 <narimiran> is there some built-in function which would do the following folding? `'(1 2 3 4 5) --> '(1 3 6 10 15)`

07:07 <narimiran> currently, i've done it manually with `for/fold`, cons-ing everything, and then `reverse`. but i'm hoping there's a better way....

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07:24 <adamgolding> I installed DrRacket on PuppyLinux and yesterday it ran but today when I click "DrRacket" nothing happens...

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12:05 <dzoe> Is there a way to use \matrix in scribble-math/dollar?

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16:19 <narimiran> is there some built-in function which would do the following folding? `'(1 2 3 4 5) --> '(1 3 6 10 15)`

16:20 <narimiran> currently, i've done it manually with `for/fold`, cons-ing everything, and then `reverse`. but i'm hoping there's a better way....

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20:09 <samth> narimiran: there is not a built-in prefix-sum, but this should work: (for/list ([i (length l)]) (apply + (take l i)))

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20:16 <bremner> isn't that a bit inefficient?

20:17 <bremner> (if that matters)

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20:19 <samth> bremner: yes it is

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20:20 <bremner> I've been marking exams all day, probably that makes me extra picky

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20:21 <bremner> ;)

20:21 <samth> bremner: to make it fast, I'd just write something that's a sensible implementaiton of `(apply + (take l i))`

20:21 <samth> ie `(define (prefix-sum l i) (for/sum ([_ (in-range i)] [j (in-list l)] j))`

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21:06 <dzoe> bremner: midterms?

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21:13 <bremner> finals

21:14 <dzoe> So soon?

21:14 <dzoe> I have to finish grading mid-terms by tomorrow ...

21:14 <bremner> our exams ended today

21:15 <bremner> May 4 is start of summer term

21:15 <dzoe> But yeah, our colleagues in UK are also basically finished ...

21:15 <dzoe> The spring semester ends in June here though

21:15 <bremner> are you on quarters?

21:15 <dzoe> (Prague)

21:15 <bremner> ah, OK.

21:16 <dzoe> And of course I am procrastinating with Racket while I should be grading Clojure :)

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