Re: [racket-users] Performance of the Racket reader

> On Jun 1, 2017, at 10:52 AM, Steve Byan's Lists <steve-l...@byan-roper.org> > wrote: > > Hi Jon, > >> On May 31, 2017, at 6:41 PM, Steve Byan's Lists <steve-l...@byan-roper.org> >> wrote: >> >>> On May 31, 2017, at 6:14 PM, Jon Zeppi

Re: [racket-users] Performance of the Racket reader

Hi Jon, > On May 31, 2017, at 6:41 PM, Steve Byan's Lists <steve-l...@byan-roper.org> > wrote: > >> On May 31, 2017, at 6:14 PM, Jon Zeppieri <zeppi...@gmail.com> wrote: >> >> So, for example: >> >> (define (map-trace stat%-set in-port)

Re: [racket-users] Performance of the Racket reader

> On Jun 1, 2017, at 12:25 AM, Neil Van Dyke <n...@neilvandyke.org> wrote: > > Steve Byan's Lists wrote on 05/31/2017 10:05 PM: >> I'd appreciate a short example of what you mean by using `apply` and >> `lambda` to destructure the list. > > I'll babble more t

Re: [racket-users] Performance of the Racket reader

Hi Neil, Thanks for the comments. > On May 31, 2017, at 8:21 PM, Neil Van Dyke wrote: > > In addition to what others have mentioned, at this scale, you might get > significant gains by adjusting your s-expression language. > > For example, instead of this: > >

Re: [racket-users] Performance of the Racket reader

> On May 31, 2017, at 6:32 PM, Matthias Felleisen wrote: > >> >> On May 31, 2017, at 6:14 PM, Jon Zeppieri wrote: >> >> >> This way, you don't build up a list or a lazy stream; you just process >> each datum as it's read. > > > Yes, that’s what I

Re: [racket-users] Performance of the Racket reader

Hi Jon, > On May 31, 2017, at 6:14 PM, Jon Zeppieri <zeppi...@gmail.com> wrote: > > On Wed, May 31, 2017 at 5:54 PM, Steve Byan's Lists > <steve-l...@byan-roper.org> wrote: >> So, I don't want to try to fit all the records in memory at once. I thought >> t

Re: [racket-users] Performance of the Racket reader

Hi Mathias, Thanks for taking a look. > On May 31, 2017, at 4:13 PM, Matthias Felleisen wrote: > > > Can you explain why you create a lazy stream instead of a plain list? The current size of a short binary trace file is about 10 GB, and I want to scale to traces many

[racket-users] Performance of the Racket reader

I've written a command-line tool in Racket to analyze the files produced by a tool that traces accesses to persistent memory by an application. The traces are large: about 5 million records per second of application run time. While developing the tool in Racket was a pleasant, productive, and

Re: [racket-users] Re: Functional object-oriented programming

> On Feb 8, 2017, at 9:05 PM, Philip McGrath wrote: > Personally, I tend to end up defining helper functions to do functional > update (often with optional keyword arguments to address the > fields-that-stay-the-same issue). Generics in the sense of racket/generic can

Re: [racket-users] Re: Functional object-oriented programming

Matthias, thanks for the confirmation that macros are the answer. Yes, mutation could be simpler. I'm learning more doing it functionally. Alex, thanks for pointing out struct-copy. I hadn't read that part of the Racket Guide yet. Would it be possible to write a macro that when invoked within

[racket-users] Functional object-oriented programming

I'm just learning Racket's object system. I feel like I've missed something, as it seems pretty verbose to functionally update objects. The pattern I use when functionally updating object state is to invoke the class constructor with a full set of arguments, some subset of which have updated

Re: [racket-users] read from stdin, except when run in DrRacket

> On Feb 8, 2017, at 2:06 PM, Matthias Felleisen wrote: > > > I thought of giving this answer too, but if this is about testing let me > propose a slightly different approach: Thanks. By "testing" I meant flailing around in the REPL while I a) learn Racket and b)

Re: [racket-users] read from stdin, except when run in DrRacket

> On Feb 8, 2017, at 2:02 PM, Ben Greenman wrote: > > One idea: you can put the argument-parsing code in the "main" submodule, then > tell DrRacket not to run the main submodule. [snip] > Then in DrRacket, click "Language -> Choose Language -> Show Details -> >

[racket-users] read from stdin, except when run in DrRacket

I'm working on a script that I eventually plan to invoke from the command line. I'd like the script to either take a file name argument or, if no arguments, read from stdin. However, while developing the script in DrRacket, I'd like to not invoke the top-level function, and to instead define an

Re: [racket-users] math/statistics running expected values

Hi Jack, > On Jan 27, 2017, at 3:57 PM, Jack Firth wrote: > > I don't have enough stats experience to help with the details of your > problem, but I'd like to suggest adding a separate package that extends > math/statistics. You'll likely have an easier time developing

[racket-users] math/statistics running expected values

Thanks for the excellent statistics library, especially the on-line algorithms for the statistics object. However, I often need to partition a large population into subsets, obtain the statistics of each subset, and obtain the statistics of various unions of the subsets as well as for the

Re: [racket-users] class copy constructors

Never mind, I got it: (define baz% (class object% (init (foo 0)) (define bar foo) (super-new) (define/public (get-bar) bar) (define/public (copy-baz) (new baz% [foo (+ (get-bar) 2)] > (define a (new baz%)) > (send a get-bar) 0 > (define b (send a copy-baz))

[racket-users] class copy constructors

I'm trying to make some simple use of Racket's class and object system, but I'm having trouble using the documentation to figure out how to accomplish something. I want to create both a no-argument default constructor and a copy-constructor. I don't see how to accomplish that. If I declare an