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  • PLT Scheme sort function

    - by Danny
    PLT Scheme guide says that it's implemented sort function is able to sort a list according to an extarcted value using a lambda function. link text The guide provides an unworking code example of this- (sort '(("aardvark") ("dingo") ("cow") ("bear")) #:key car string<?) Which returns an error. How is this function is supposed to be calles so that it will actually sort a list according to values calculated by a given function?

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  • Scheme Editor/IDE for Mac

    - by Carlton Gibson
    I've begun working through Structure and Interpretation of Computer Programs. Dutifully, I've installed mit-scheme. What I need now is an editor/IDE for the Mac that can handle the indentation and balance parentheses (or advice on how to best to configure the packaged tools). Any suggestions? TIA

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  • plt-scheme : catching mouse click event on canvas

    - by Thura
    I am writing a tic-tac-toe game in plt-scheme as my AI course project. The idea for gui is a grid with 9 boxes, each with a canvas, using panes ... When the user click on a canvas, 'X' or 'O' will be drawn accordingly ... The question is how can I catch mouse click event on canvas? I found out I need to use on-event, but still don't know how? Any clues?

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  • Dark color scheme for Eclipse?

    - by Bartosz Radaczynski
    Is Eclipse at all themeable? I would like to install a dark color scheme for it, since I much prefer white text on dark background than the other way around. Edit: so apparently there is NO easy way to do it. Shame, I really prefer Eclipse to NetBeans, but I cannot stand the white background (and NetBeans does support themes).

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  • Continuation (call/cc) in Scheme

    - by darkie15
    Hi All, I need to understand Continuations in Scheme for my upcoming exams and I have no idea about continuations at all. Can anyone please suggest me sources of how to go about learning continuations? Regards, darkie

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  • scheme recursive lambda

    - by Mike
    Is there a way to have a recursive lambda expression in scheme without relying an external identifier? I know you can have (define fact (lambda (n) (if (= n 0) 1 (fact (- n 1)))) but it would be nice if fact wasn't hard coded in the lambda expression, it seems improper.

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  • Scheme define/lambda shorthand

    - by incrediman
    In Scheme, how can I make use of the define/lambda shorthand for nested lambda expressions within my define? For example given the following procedure... (define add (lambda (num1 num2) (+ num1 num2))) One can shorten it to this: (define (add num1 num2) (+ num1 num2)) However, how can I shorten the following function similarly ? (define makeOperator (lambda (operator) (lambda (num1 num2) (operator num1 num2)))) ;example useage - equivalent to (* 3 4): ((makeOperator *) 3 4)

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  • small & readable scheme interpreter in C++ ?

    - by anon
    Anyone know of a good / small scheme interpreter in C++? Perferably something < 2000 LOC, with a simple garbage collectro (either compacting or mark & sweep), no need to support all of R5RS, just basics of if/lambda/set!/cons/car/cdr and some basic operations. Thanks!

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  • iOS - Open certain view controller with URL scheme

    - by hansenmd
    I'm playing around with URL schemes in my app. I easily made one to open my app, just adding the necessary items to info.plist. This current URL "myappname://" takes the user to the initial view controller, FirstTableViewController, but I was wondering if it would be possible to modify that URL scheme so it I can have one that takes the user to a certain view controller, such as ThirdTableViewController. I would use this as a handy feature in something like Launch Center.

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  • Channel mit Anspruch

    - by A&C Redaktion
    Den ersten Geburtstag konnte das neue Channel-Programm von Oracle ja bereits Anfang des Jahres feiern. Die Bilanz seitens Oracle ist positiv, doch was sagen die Partner dazu? Opitz Consulting ist einer der Vertriebspartner, die in Deutschland mit mindestens fünf Spezialisierungen das Platin-Level erreicht haben. Sich innerhalb eines Jahres in den Bereichen BI, Database, Enterprise Linux, Real Application Clusters und SOA zu spezialisieren, war keine Kinderspiel, verrät Michael Page, Prokurist bei Opitz Consulting in Interview mit "ChannelPartner": Etwa 15 Prozent seiner Arbeitszeit hat er 2010 darauf verwendet. Ob der nächste Schritt das Diamant-Level sein soll, ließ Page offen. Sicher ist jedoch, dass für den führenden Projektspezialisten im Java-, SOA- und Oracle Markt weitere Spezialisierungen anstehen, darunter Datenbank-Performance-Tuning, Virtualisierung und Data Warehouse. Auch Oracle selbst legt noch mal nach: Zu den 50 Spezialisierungen im OPN Programm werden bis Ende des Jahres weitere 20 hinzukommen, die das Programm für Branchen wie das Gesundheitswesen, Energieversorger oder Retail attraktiv machen sollen. Ausführliche Informationen dazu sowie ein Interview mit Silvia Kaske und Christian Werner von Oracle ist in der aktuellen Ausgabe von "ChannelPartner" (Nr. 4/11 vom 28.2.2011) zu finden.

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  • Cloud Control 12c: Verteilen von beliebiger Software mit Deployment Prozeduren

    - by Ralf Durben (DBA Community)
    Mit dem Lifecycle Management Pack von Oracle Enterprise Manager Cloud Control 12c können Sie Software aus der grafischen Konsole heraus auf Zielsysteme verteilen und installieren, also provisionieren. Dieses funktioniert für viele Oracle Produkte in einer vorgefertigen Form unter Verwendung von Deployment Prozeduren, die als eine Art Spezialformat für Provisionierungsskripte angesehen werden können. Dabei können die vorgefertigten Deployment Prozeduren direkt oder für die eigenen Bedürfnisse modifiziert verwendet werden. Sie können diese Technik jedoch auch für die Provisionierung beliebiger Software nutzen, indem Sie eigene Deployment Prozeduren erstellen. Als einfaches Beispiel einer solchen Provisionierung soll in diesem Tipp das Verteilen einer ZIP-Datei mit anschliessendem Auspacken betrachtet werden. Bewusst wird in diesem Tipp versucht, das Beispiel einfach zu halten, um einen leichten Einstieg zu ermöglichen. Dieser Tipp zeigt Ihnen, wie Sie eine ZIP-Datei mit einer selbstgeschriebenen Deployment Prozedur provisionieren können.

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  • jQuery modifie ses licences et ne garde que la licence MIT

    jQuery modifie ses licences et ne garde que la licence MIT. La fondation jQuery a décidé de modifier sa gestion de licence. Elle abandonne la licence GNU General Public pour ne garder que la licence MIT. Cela lui permet d'éliminer la confusion qui existait sur la politique de double licence. Du côté des utilisateurs, ça ne change pas grand chose. L'utilisateur reste libre d'utiliser des projets de la fondation, de les modifier et même de les repasser en licence GPL si ça l'enchante. Effectivement, la licence MIT est tout à fait compatible avec licence GNU GPL. Il faut savoir qu'il y a plus de 500 personnes qui ont contribués aux projets jQuery. La fondation souhaite q...

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  • Does approaching SICP in clojure have a high chance of success? [on hold]

    - by ironicaldiction
    I am a third year bachelor student in a software engineering program, and I brought up the idea of reading SICP to an adviser to gain a deeper and more fundamental understanding of the principles behind all this software we engineer. He suggested not to learn scheme to complete the book (because it's not as common as modern dialects of lisp) but to do the exercises in clojure instead. My worry is that completing exercises in clojure instead of scheme will make an already difficult book tortuous. If I do attempt the book's exercises in the more modern clojure, will it be difficult to succeed (for example, because I can't find any real solutions, the syntax they teach for scheme is different, etc.), or do you think approaching the book in clojure could be just as successful as approaching it in scheme? I'm really not knowledgeable enough about either clojure or scheme to make an argument about this, so I wanted to know if I should bring it up or not.

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  • Linking Linux MIT Kerberos with a Windows 2003 Active Directory

    - by Beerdude26
    Greetings, I was wondering how one might link a Linux MIT Kerberos with a Windows 2003 Active Directory to achieve the following: A user, [email protected], attempts to log in at an Apache website, which runs on the same server as the Linux MIT Kerberos. The Apache module first asks the local Linux MIT Kerberos if he knows a user by that name or realm. The MIT Kerberos finds out it isn't responsible for that realm, and forwards the request to the Windows 2003 Active Directory. The Windows 2003 Active Directory replies positively and gives this information to the Linux MIT Kerberos, which in turn tells this to the Apache module, which grants the user access to its files. Here is an image of the situation: http://img179.imageshack.us/img179/5092/linux2k3.png (I'm not allowed to embed images just yet.) The documentation I have read concerning this issue often differ from this problem: Some discuss linking up a MIT Kerberos with an Active Directory to gain access to resources on the Active Directory server; While another uses the link to authenticate Windows users to the MIT Kerberos through the Windows 2003 Active Directory. (My problem is the other way around.) So what my question boils down to, is this: Is it possible to have a Linux MIT Kerberos server pass through requests for a Active Directory realm, and then have it receive the reply and give it to the requesting service? (Although it's not a problem if the requesting service and the Windows 2003 Active Directory communicate directly.) Suggestions and constructive criticism are greatly appreciated. :)

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  • Determining your websites color scheme

    - by Steve Hayes
    One of the biggest issues I have, from a UI standpoint, when building a new website is figuring out what colors I will use and of those colors, do they actually work well together. I found this site that has really helped me out and I figured I would share it with all of you and also get some responses back about either sites similar or other ways that you get/figure out your color schemes. Here is the site that I currently use: http://kuler.adobe.com/ With Adobe Kuler, you can chose a base color and it will suggest 5 colors, including your color, that go well with one another. You can, of course, modify the colors it chooses. Also,one of the main features I use, is the image color matching. You can upload an image and it will determine a color scheme based on the colors of the image. So if you have a logo and want to use the colors of the logo, then this works perfectly for you. Thank you and I look forward to your feedback!

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  • Scheme early "short circuit return"?

    - by Suan
    I'm trying to find out how I can do an "early return" in a scheme procedure without using a top-level if or cond like construct. (define (win b) (let* ((test (first (first b))) (result (every (lambda (i) (= (list-ref (list-ref b i) i) test)) (enumerate (length b))))) (when (and (not (= test 0)) result) test)) 0) For example, in the code above, I want win to return test if the when condition is met, otherwise return 0. However, what happens is that the procedure will always return 0, regardless of the result of the when condition. The reason I am structuring my code this way is because in this procedure I need to do numerous complex checks (multiple blocks similar to the let* in the example) and putting everything in a big cond would be very unwieldy.

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  • Scheme procedure problem

    - by Zun
    I defined the Scheme procedure to return another procedure with 2 parameters : (define (smooth f) (?(x dx)(/ (+ (f (- x dx)) (f x) (f (+ x dx))) 3.0))) if i run this procedure with sin procedure with 2 arguments 10 and 0.0001 then it is ok ((smooth sin) 10 0.0001) ==> -0.544021109075966 if i run this procedure recursively, then it has error ((smooth (smooth sin)) 10 0.0001) ==> procedure expects 2 arguments, given 1: #<promise:temp6> So can anyone tell me where is my problem? Thank you in advance !!! PS:this is apart of exercise 1.44 in SICP

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  • What's the point of lambda in scheme?

    - by incrediman
    I am learning scheme. I know how to use both lambda and let expressions. However I'm struggling to figure out what the point is of using lambda. Can't you do everything with let that you can with lambda? It would be especially helpful to see an example of a situation where a lambda expression is a better choice than let. One other thing - are there also situations where let is more useful than lambda? If so such an example would be nice as well. Thanks!

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  • Scheme open source projects?

    - by Ben
    Hi I'm learning scheme and was wondering if there are any active open-source projects I might be able to get involved in? I'm nearing the end of SICP and although this has good complex examples no textbook code compares to real-world applications. eg testing code / benchmarking / revision control styles / sheer size and scope etc. Hence my curiousity at seeing a project in the wild. I tried searching google code but only found projects that are interpreters that implement RSR5/6. Perhaps there are not many projects out there and I should consider scala?! Advice or even pointers to specific projects appreciated.

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  • trying to make a scheme procedure

    - by asfejaeofijfe
    trying to make a scheme procedure called make-odd-mapper! its supposed to be a procedure that takes one input, a procedure, and produces a procedure as an output ex: (define i4 (mlist 10 2 30 4)) (i4) {10 2 30 4} ((make-odd-mapper! add-one) i4) i4 {11 2 31 4} I know the problem needs to mutate the input list and that set-mcar! and void are apart of it......could anyone give me some reasonable lines of code to solve this? It would be useful in case anyone was wondering about mutation.....and using it to create a procedure that makes a procedure as its output....

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  • Problems making an accurate Visual Studio scheme for Vim (vim scheme specialist needed) .

    - by janoChen
    I'm trying to make an accurate Visual Studio scheme. I set hi function to blood color (#9A1102) for the "CSS function" (selector). But now the brackets with properties (id, class) in html elements also have blood color: (ironically the same color here in Stackoverflow). But I want them blue (#2902FC) e.g.: <div class="first"> <div id="nopic"> Sample of code: " Syntax highlighting hi Comment guifg=#777777 gui=none hi Todo guifg=#8f8f8f gui=none hi Constant guifg=#e5786d gui=none hi String guifg=#2902FC gui=none hi Identifier guifg=#2902FC gui=none hi Function guifg=#9A1102 gui=none hi Type guifg=#EF2811 gui=none hi Statement guifg=#9A1102 gui=none hi Keyword guifg=#9A1102 gui=none hi PreProc guifg=#2902FC gui=none hi Number guifg=#2902FC gui=none hi Special guifg=#2902FC gui=none " Bottom hi Question guifg=white gui=none hi Question ctermfg=white term=none hi ModeMsg guifg=white gui=none

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  • Writing out to a file in scheme

    - by Ceelos
    The goal of this is to check if the character taken into account is a number or operand and then output it into a list which will be written out to a txt file. I'm wondering which process would be more efficient, whether to do it as I stated above (writing it to a list and then writing that list out into a file) or being writing out into a txt file right from the procedure. I'm new with scheme so I apologize if I am not using the correct terminology (define input '("3" "+" "4")) (define check (if (number? (car input)) (write this out to a list or directly to a file) (check the rest of file))) Another question I had in mind, how can I make it so that the check process is recursive? I know it's a lot of asking but I've getting a little frustrated with checking out the methods that I have found on other sites. I really appreciate the help!

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