Hi all again, In the documentation I find functions for creating tar files (http://docs.racket-lang.org/file/tar.html?q=tar#%28def._%28%28lib._file/tar..rkt%29._tar%29%29), but none for unpacking them. Is anyone aware of some library functions for unpacking tarballs? Thanks, -ryan
Sorry for the delay. In this case, Eric's interpretation is the one I had in mind! On Mon, Aug 30, 2010 at 9:40 AM, Eric Tanter <etanter <at> dcc.uchile.cl> wrote: > Hi Ionut, Jay, > > I don't understand the question this way -- rather, how to maintain laziness without introducing an extra variant of CFAE-Value, ie. reusing the Closure variant to implement expression closures. > > Maybe Shriram can confirm which interpretation is correct ;) > > -- Éric > > > On Aug 30, 2010, at 9:21 AM, Jay McCarthy wrote: > >> Hi Ionut, >> >> In this section PLAI is asking you to write more of a meta-interpreter >> where you use the thunks of the language you are writing the >> interpreter in. >> >> Jay >> >> On Mon, Aug 30, 2010 at 2:23 AM, Ionut G. Stan <ionut.g.stan <at> gmail.com> wrote: >>> Hi, >>> >>> I'm pretty sure this is not the best mailing list to ask about PLAI, but as >>> I've found no other I decided to try here (I've found about PLAI on the >>> original DrScheme mailing list, and racket-lang.org seems to mention PLAI in(Continue reading)
Hi,
Is it possible to have a splash screen displayed while loading a GRacket program?
Much like DrRacket's in fact.
Because for some projects, it can take several seconds to initialize everything.
I tried to open up a frame at the very beginning of the code, but it only shows up
after everything is loaded too.
How is DrRacket splash screen shown up so early, while DrRacket is loading?
Thanks,
Laurent
<div><p>Hi,<br><br>Is it possible to have a splash screen displayed while loading a GRacket program?<br>Much like DrRacket's in fact.<br>Because for some projects, it can take several seconds to initialize everything. <br>I tried to open up a frame at the very beginning of the code, but it only shows up <br> after everything is loaded too.<br><br>How is DrRacket splash screen shown up so early, while DrRacket is loading?<br><br>Thanks,<br>Laurent<br></p></div>
Noel Welsh wrote at 08/31/2010 04:36 PM: > In general this is a huge problem (equivalent, I think, to the "sufficiently smart compiler" problem, which itself is equivalent to solving AI). > What Noel said. Though, it might be a useful thing for the Racket interpreter (compiler) to have hooks of some kind for pluggable optimizations. Useful both for practical use and for increasing how Racket can be used as a language research platform. As a user, would be nice if I could get a matrix library without special compiler optimizations by doing: (require (planet foo/matrix)) Or, if I indicated that I wanted the special compiler optimizations provided by the module, like: (require/hooks (planet foo/matrix)) then special optimization code from the foo/matrix module can hook itself into a compiler phase for my using module. In this example, perhaps in a phase after macro expansion and with all (current) references resolved. (I'm thinking of hooks covering only intra-module stuff for the using module, no access into other modules.) I don't know how feasible it would be to provide these hooks in a particular version of Racket. Regarding keeping such hooks from encumbering evolution of future versions of Racket, would it suffice for the compiler to not be obligated to call the hooks and, if it does call, to announce its version when calling the hooks? The hook code would be responsible for doing the right thing (or nothing) for that particular Racket version. So, in this example, when a new version of Racket comes out, the foo/matrix would likely run without requested hook optimizations until the developer of foo/matrix looks at any changes made to the internal representations exposed by the hooks in that version of Racket, and makes any necessary changes to the optimizations. Importantly, Racket would make no commitment to maintain the representations between versions, nor to even to document any of the representations. It's fortunate that Matthew has seemingly infinite time for all the work that people would like him to do. :) I still like the idea of doing the matrix optimizations in pure Racket with internally-optimizing ADTs with lazy operations, rather than with syntax extension mini-language, an entire front-end language, or compiler hooks. -- -- http://www.neilvandyke.org/
A minimal amount of stuff is loaded (roughly what is loaded when gracket itself starts up) and then the splash screen is opened and the rest of drracket is loaded via a dynamic-require. Also, progress on the splash screen's gauge% is made each time a file is loaded, which is monitored by the load-handler. Robby On Wed, Sep 1, 2010 at 1:56 AM, Laurent <laurent.orseau <at> gmail.com> wrote: > Hi, > > Is it possible to have a splash screen displayed while loading a GRacket > program? > Much like DrRacket's in fact. > Because for some projects, it can take several seconds to initialize > everything. > I tried to open up a frame at the very beginning of the code, but it only > shows up > after everything is loaded too. > > How is DrRacket splash screen shown up so early, while DrRacket is loading? > > Thanks, > Laurent > > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
Excellent! Thanks a lot!
By any chance, do you remember the name of the file that does that?
(Don't take more than 10s for this question, it's not worth it.)
A minimal amount of stuff is loaded (roughly what is loaded when
gracket itself starts up) and then the splash screen is opened and the
rest of drracket is loaded via a dynamic-require. Also, progress on
the splash screen's gauge% is made each time a file is loaded, which
is monitored by the load-handler.
Robby> _________________________________________________
On Wed, Sep 1, 2010 at 1:56 AM, Laurent <laurent.orseau-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Hi,
>
> Is it possible to have a splash screen displayed while loading a GRacket
> program?
> Much like DrRacket's in fact.
> Because for some projects, it can take several seconds to initialize
> everything.
> I tried to open up a frame at the very beginning of the code, but it only
> shows up
> after everything is loaded too.
>
> How is DrRacket splash screen shown up so early, while DrRacket is loading?
>
> Thanks,
> Laurent
>
> For list-related administrative tasks:
> http://lists.racket-lang.org/listinfo/users
>
<div> <p>Excellent! Thanks a lot!<br>By any chance, do you remember the name of the file that does that? <br>(Don't take more than 10s for this question, it's not worth it.)<br><br></p> <div class="gmail_quote">On Wed, Sep 1, 2010 at 14:00, Robby Findler <span dir="ltr"><<a href="mailto:robby <at> eecs.northwestern.edu">robby@...</a>></span> wrote:<br><blockquote class="gmail_quote">A minimal amount of stuff is loaded (roughly what is loaded when<br> gracket itself starts up) and then the splash screen is opened and the<br> rest of drracket is loaded via a dynamic-require. Also, progress on<br> the splash screen's gauge% is made each time a file is loaded, which<br> is monitored by the load-handler.<br><br> Robby<br><div> <div></div> <div class="h5"> <br> On Wed, Sep 1, 2010 at 1:56 AM, Laurent <<a href="mailto:laurent.orseau <at> gmail.com">laurent.orseau@...</a>> wrote:<br> > Hi,<br> ><br> > Is it possible to have a splash screen displayed while loading a GRacket<br> > program?<br> > Much like DrRacket's in fact.<br> > Because for some projects, it can take several seconds to initialize<br> > everything.<br> > I tried to open up a frame at the very beginning of the code, but it only<br> > shows up<br> > after everything is loaded too.<br> ><br> > How is DrRacket splash screen shown up so early, while DrRacket is loading?<br> ><br> > Thanks,<br> > Laurent<br> ><br> </div> </div>> _________________________________________________<br> > For list-related administrative tasks:<br> > <a href="http://lists.racket-lang.org/listinfo/users" target="_blank">http://lists.racket-lang.org/listinfo/users</a><br> ><br> </blockquote> </div> <br> </div>
collects/drracket/drracket.rkt does something similar to set up compilation handlers and (optionally) a profiler that I use for performance debugging, and then it loads drracket/private/drracket-normal.rkt which does the splash screen bit. Robby On Wed, Sep 1, 2010 at 7:11 AM, Laurent <laurent.orseau <at> gmail.com> wrote: > Excellent! Thanks a lot! > By any chance, do you remember the name of the file that does that? > (Don't take more than 10s for this question, it's not worth it.) > > On Wed, Sep 1, 2010 at 14:00, Robby Findler <robby <at> eecs.northwestern.edu> > wrote: >> >> A minimal amount of stuff is loaded (roughly what is loaded when >> gracket itself starts up) and then the splash screen is opened and the >> rest of drracket is loaded via a dynamic-require. Also, progress on >> the splash screen's gauge% is made each time a file is loaded, which >> is monitored by the load-handler. >> >> Robby >> >> On Wed, Sep 1, 2010 at 1:56 AM, Laurent <laurent.orseau <at> gmail.com> wrote: >> > Hi, >> > >> > Is it possible to have a splash screen displayed while loading a GRacket >> > program? >> > Much like DrRacket's in fact. >> > Because for some projects, it can take several seconds to initialize >> > everything. >> > I tried to open up a frame at the very beginning of the code, but it >> > only >> > shows up >> > after everything is loaded too. >> > >> > How is DrRacket splash screen shown up so early, while DrRacket is >> > loading? >> > >> > Thanks, >> > Laurent >> > >> > _________________________________________________ >> > For list-related administrative tasks: >> > http://lists.racket-lang.org/listinfo/users >> > > > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
Thanks again! Very helpful.
collects/drracket/drracket.rkt does something similar to set up
compilation handlers and (optionally) a profiler that I use for
performance debugging, and then it loads
drracket/private/drracket-normal.rkt which does the splash screen bit.
Robby
On Wed, Sep 1, 2010 at 7:11 AM, Laurent <laurent.orseau-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> Excellent! Thanks a lot!
> By any chance, do you remember the name of the file that does that?
> (Don't take more than 10s for this question, it's not worth it.)
>
> On Wed, Sep 1, 2010 at 14:00, Robby Findler <robby-5YcgHWA4rVnfxgxxWyf0drK6bRJNSFrb@public.gmane.org>
> wrote:
>>
>> A minimal amount of stuff is loaded (roughly what is loaded when
>> gracket itself starts up) and then the splash screen is opened and the
>> rest of drracket is loaded via a dynamic-require. Also, progress on
>> the splash screen's gauge% is made each time a file is loaded, which
>> is monitored by the load-handler.
>>
>> Robby
>>
>> On Wed, Sep 1, 2010 at 1:56 AM, Laurent <laurent.orseau-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> > Hi,
>> >
>> > Is it possible to have a splash screen displayed while loading a GRacket
>> > program?
>> > Much like DrRacket's in fact.
>> > Because for some projects, it can take several seconds to initialize
>> > everything.
>> > I tried to open up a frame at the very beginning of the code, but it
>> > only
>> > shows up
>> > after everything is loaded too.
>> >
>> > How is DrRacket splash screen shown up so early, while DrRacket is
>> > loading?
>> >
>> > Thanks,
>> > Laurent
>> >
>> > _________________________________________________
>> > For list-related administrative tasks:
>> > http://lists.racket-lang.org/listinfo/users
>> >
>
>
<div> <p>Thanks again! Very helpful.<br><br></p> <div class="gmail_quote">On Wed, Sep 1, 2010 at 14:16, Robby Findler <span dir="ltr"><<a href="mailto:robby <at> eecs.northwestern.edu">robby@...</a>></span> wrote:<br><blockquote class="gmail_quote">collects/drracket/drracket.rkt does something similar to set up<br> compilation handlers and (optionally) a profiler that I use for<br> performance debugging, and then it loads<br> drracket/private/drracket-normal.rkt which does the splash screen bit.<br><br> Robby<br><div> <div></div> <div class="h5"> <br> On Wed, Sep 1, 2010 at 7:11 AM, Laurent <<a href="mailto:laurent.orseau <at> gmail.com">laurent.orseau@...</a>> wrote:<br> > Excellent! Thanks a lot!<br> > By any chance, do you remember the name of the file that does that?<br> > (Don't take more than 10s for this question, it's not worth it.)<br> ><br> > On Wed, Sep 1, 2010 at 14:00, Robby Findler <<a href="mailto:robby <at> eecs.northwestern.edu">robby@...</a>><br> > wrote:<br> >><br> >> A minimal amount of stuff is loaded (roughly what is loaded when<br> >> gracket itself starts up) and then the splash screen is opened and the<br> >> rest of drracket is loaded via a dynamic-require. Also, progress on<br> >> the splash screen's gauge% is made each time a file is loaded, which<br> >> is monitored by the load-handler.<br> >><br> >> Robby<br> >><br> >> On Wed, Sep 1, 2010 at 1:56 AM, Laurent <<a href="mailto:laurent.orseau@...">laurent.orseau@...</a>> wrote:<br> >> > Hi,<br> >> ><br> >> > Is it possible to have a splash screen displayed while loading a GRacket<br> >> > program?<br> >> > Much like DrRacket's in fact.<br> >> > Because for some projects, it can take several seconds to initialize<br> >> > everything.<br> >> > I tried to open up a frame at the very beginning of the code, but it<br> >> > only<br> >> > shows up<br> >> > after everything is loaded too.<br> >> ><br> >> > How is DrRacket splash screen shown up so early, while DrRacket is<br> >> > loading?<br> >> ><br> >> > Thanks,<br> >> > Laurent<br> >> ><br> >> > _________________________________________________<br> >> > For list-related administrative tasks:<br> >> > <a href="http://lists.racket-lang.org/listinfo/users" target="_blank">http://lists.racket-lang.org/listinfo/users</a><br> >> ><br> ><br> ><br> </div> </div> </blockquote> </div> <br> </div>
I've been having an interesting discussion off-list with David Kay, but have concluded that we need the expertise of somebody more knowledgeable about Scheme/Racket and its philosophy. The "#i" indicates that a number is inexact, and that further computation based on it should be interpreted accordingly. The Scheme/Racket numeric libraries automatically mark as "inexact" most results of trig, exponential, log, sqrt, and similar functions, even if the inputs were exact, because the mathematically correct answers to these are irrational. Likewise, The question is under what circumstances (if any) you would want to mark something as inexact that DIDN'T come from an irrational-valued library function or constant. An example in my textbook is (define TANK-CAPACITY-GALLONS #i13.6) (define MPG #i28) because the capacity of a gas tank, and miles-per-gallon fuel efficiency, are based on physical measurements and therefore inherently inexact. On the other hand, you could work through this entire example using exact numbers, and everything would come out correctly (since the only arithmetic involved is addition, subtraction, multiplication, and division), so the argument could be made that putting #i in there is distracting and pedantic. Opinions? Corrections? Stephen Bloch sbloch@...
On Sep 1, 2010, at 9:14 AM, I wrote: > The "#i" indicates that a number is inexact, and that further computation based on it should be interpreted accordingly. The Scheme/Racket numeric libraries automatically mark as "inexact" most results of trig, exponential, log, sqrt, and similar functions, even if the inputs were exact, because the mathematically correct answers to these are irrational and don't have exact representations in any common, convenient computer representation. Likewise, A sentence got cut off here, saying that the predefined constants pi and e are marked as inexact. Stephen Bloch sbloch@...
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