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  • Currying a function n times in Scheme

    - by user1724421
    I'm having trouble figuring out a way to curry a function a specified number of times. That is, I give the function a natural number n and a function fun, and it curries the function n times. For example: (curry n fun) Is the function and a possible application would be: (((((curry 4 +) 1) 2) 3) 4) Which would produce 10. I'm really not sure how to implement it properly. Could someone please give me a hand? Thanks :)

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  • How to display data uri scheme into a C# WebBrowser Controler

    - by Emanuel
    How can I show an image base64 encoded using WebBrowser control in C#? I used the following code: <img src="data:image/gif;base64,/9j/4AAQSkZJRgABAgAAZABkAA7AAR R894ADkFkb2JlAGTAAAAAAfbAIQABAMDAwMDBAMDBAYEAwQGBwUEBAUHCAYGBw ... uhWkvoJfQO2z/rf4VpL6CX0Dts/63+FaS+gl9A7bP+tthWkvoJfQODCde4qfcg RiNWK3UyUeX9CXpHU43diOK915X5fG/reux5hUAUBftZ" /> but no image is displayed. One solution would be to save images locally and using absolute path, but this is not desirable. Any idea? Thanks.

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  • custom URL scheme doesn't work! Navigon AppInteract

    - by rdesign
    Hey guys, It is really frustrating me. I used the doc provided by Navigon itself. Unfortunately it doesn't work as expected. Navigon launches, but stops at the main menu. All I do is this: NSString *myTestStr = [NSString stringWithFormat:@"navigon://App|Another place|FRA|75008|PARIS|rue de Turin|17|2.324621|48.881273"]; NSString *navigonStrEsc = [myTestStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; NSLog(@"navigonStr: %@", navigonStrEsc); [[UIApplication sharedApplication] openURL:[NSURL URLWithString:navigonStrEsc]]; Any ideas what is wrong with my way? thanks a lot!

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  • Extracting fields from a define-type object in Scheme

    - by Mike
    Hi, I am trying to extract the field 'name' or 'named-expr' from the following object: (bind 'x (num 5)) ;; note that this is not a list, but a type Binding With the Binding definition: (define-type Binding (bind (name symbol?) (named-expr WAE?))) I have tried, but received the error "reference to an identifier before its definition: Binding-name." Here is what I tried typing: (begin (Binding-name (bind 'x (num 5)))) (begin (define x (bind 'x (num 5))) (Binding-name x)) Thank you!

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  • Find all paths from root to leaves of tree in Scheme

    - by grifaton
    Given a tree, I want to find the paths from the root to each leaf. So, for this tree: D / B / \ A E \ C-F-G has the following paths from root (A) to leaves (D, E, G): (A B D), (A B E), (A C F G) If I represent the tree above as (A (B D E) (C (F G))) then the function g does the trick: (define (g tree) (cond ((empty? tree) '()) ((pair? tree) (map (lambda (path) (if (pair? path) (cons (car tree) path) (cons (car tree) (list path)))) (map2 g (cdr tree)))) (else (list tree)))) (define (map2 fn lst) (if (empty? lst) '() (append (fn (car lst)) (map2 fn (cdr lst))))) But this looks all wrong. I've not had to do this kind of thinking for a while, but I feel there should be a neater way of doing it. Any ideas for a better solution (in any language) would be appreciated.

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  • Getting the median of 3 values using scheme's car & cdr

    - by kristian Roger
    The problem this time is to get the median of three values (easy) I did this: (define (med x y z) (car(cdr(x y z))) and it was accepted but when testing it: (med 3 4 5) I get this error: Error: attempt to call a non-procedure (2 3 4) And when entering letters instead of number i get: (md x y z) Error: undefined varia y (package user) Using something besides x y z I get: (md d l m) Error: undefined variable d (package user) the question was deleted dont know how anyway write a function that return the median of 3 values

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  • Problem with circular definition in Scheme

    - by user8472
    I am currently working through SICP using Guile as my primary language for the exercises. I have found a strange behavior while implementing the exercises in chapter 3.5. I have reproduced this behavior using Guile 1.4, Guile 1.8.6 and Guile 1.8.7 on a variety of platforms and am certain it is not specific to my setup. This code works fine (and computes e): (define y (integral (delay dy) 1 0.001)) (define dy (stream-map (lambda (x) x) y)) (stream-ref y 1000) The following code should give an identical result: (define (solve f y0 dt) (define y (integral (delay dy) y0 dt)) (define dy (stream-map f y)) y) (solve (lambda (x) x) 1 0.001) But it yields the error message: standard input:7:14: While evaluating arguments to stream-map in expression (stream-map f y): standard input:7:14: Unbound variable: y ABORT: (unbound-variable) So when embedded in a procedure definition, the (define y ...) does not work, whereas outside the procedure in the global environment at the REPL it works fine. What am I doing wrong here? I can post the auxiliary code (i.e., the definitions of integral, stream-map etc.) if necessary, too. With the exception of the system-dependent code for cons-stream, they are all in the book. My own implementation of cons-stream for Guile is as follows: (define-macro (cons-stream a b) `(cons ,a (delay ,b)))

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  • make tree in scheme

    - by ???
    (define (entry tree) (car tree)) (define (left-branch tree) (cadr tree)) (define (right-branch tree) (caddr tree)) (define (make-tree entry left right) (list entry left right)) (define (mktree order items_list) (cond ((= (length items_list) 1) (make-tree (car items_list) '() '())) (else (insert2 order (car items_list) (mktree order (cdr items_list)))))) (define (insert2 order x t) (cond ((null? t) (make-tree x '() '())) ((order x (entry t)) (make-tree (entry t) (insert2 order x (left-branch t)) (right-branch t))) ((order (entry t) x ) (make-tree (entry t) (left-branch t) (insert2 order x (right-branch t)))) (else t))) The result is: (mktree (lambda (x y) (< x y)) (list 7 3 5 1 9 11)) (11 (9 (1 () (5 (3 () ()) (7 () ()))) ()) ()) But I'm trying to get: (7 (3 (1 () ()) (5 () ())) (9 () (11 () ()))) Where is the problem?

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  • Scheme: Mysterious void in pattern match.

    - by Schemer
    Hi. I am writing a function called annotate that uses match-lambda -- often with recursive calls to annotate. Here is one of the pattern matches: (`(lambda (,<param1> . ,<params>) ,<stmts>) `(CLOSURE ENV (,<param1> . ,<params>) (lambda (ENV) ,(map annotate (map (lambda (x) (append `(,<param1> . ,<params>) (list x))) `(,<stmts>)))))) However, when this pattern is matched this is what returns: '(CLOSURE ENV (x) (lambda (ENV) ((CLOSURE ENV (x y) (lambda (ENV) ((+ x y)))))) #<void>) Specifically I can't figure out where "void" is coming from. In fact, if I include the line: ,(displayln (map annotate (map (lambda (x) (append `(,<param1> . ,<params>) (list x))) `(,<stmts>)))) it prints: ((CLOSURE ENV (x y) (lambda (ENV) ((+ x y))))) notably without "void". If someone could tell me what the problem is it would be greatly appreciated. Thanks.

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  • What color scheme do you use for programming?

    - by EndangeredMassa
    I get a lot of attention at work because I am the only one who bothered to change the default color settings in Visual Studio. I just modified them myself. I can provide the settings file if anyone cares to import it. Here's an example of how it looks. It reminds me of DOS/BASIC programming before I actually knew how to program. I also find it to be very readable. What color schemes do you use?! EDIT: To clarify, I only edited the text settings. The windows and panels of VS2005 are still the windows default.

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  • using lambda instead of let in scheme

    - by Radagaisus
    Hey, In SICP 1.2.1 there is a function that makes a rational number, as follow: (define (make-rat n d) (let ((g (gcd n d))) (cons (/ n g) (/ d g)))) I'm just curious how you can implement the same thing using lambda instead of let, without calling GCD twice. I couldn't figure it out myself.

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  • Writing an Eval Procedure in Scheme?

    - by Planeman
    My problem isn't with the built-in eval procedure but how to create a simplistic version of it. Just for starters I would like to be able to take this in '(+ 1 2) and have it evaluate the expression + where the quote usually takes off the evaluation. I have been thinking about this and found a couple things that might be useful: Unquote: , (quasiquote) (apply) My main problem is regaining the value of + as a procedure and not a symbol. Once I get that I think I should just be able to use it with the other contents of the list. Any tips or guidance would be much appreciated.

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  • True / false evaluation doesn't work as expected in Scheme

    - by ron
    I'm trying to compare two booleans : (if (equal? #f (string->number "123b")) "not a number" "indeed a number") When I run this in the command line of DrRacket I get "not a number" , however , when I put that piece of code in my larger code , the function doesn't return that string ("not a number") , here's the code : (define (testing x y z) (define badInput "ERROR") (if (equal? #f (string->number "123b")) "not a number" "indeed a number") (display x)) And from command line : (testing "123" 1 2) displays : 123 Why ? Furthermore , how can I return a value , whenever I choose ? Here is my "real" problem : I want to do some input check to the input of the user , but the thing is , that I want to return the error message if I need , before the code is executed , because if won't - then I would run the algorithm of my code for some incorrect input : (define (convert originalNumber s_oldBase s_newBase) (define badInput "ERROR") ; Input check - if one of the inputs is not a number then return ERROR (if (equal? #f (string->number originalNumber)) badInput) (if (equal? #f (string->number s_oldBase)) badInput) (if (equal? #f (string->number s_newBase)) badInput) (define oldBase (string->number s_oldBase)) (define newBase (string->number s_newBase)) (define outDecimal (convertIntoDecimal originalNumber oldBase)) (define result "") ; holds the new number (define remainder 0) ; remainder for each iteration (define whole 0) ; the whole number after dividing (define temp 0) (do() ((= outDecimal 0)) ; stop when the decimal value reaches 0 (set! whole (quotient outDecimal newBase)) ; calc the whole number (set! temp (* whole newBase)) (set! remainder (- outDecimal temp)) ; calc the remainder (set! result (appending result remainder)) ; append the result (set! outDecimal (+ whole 0)) ; set outDecimal = whole ) ; end of do (if (> 1 0) (string->number (list->string(reverse (string->list result))))) ) ;end of method This code won't work since it uses another method that I didn't attach to the post (but it's irrelevant to the problem . Please take a look at those three IF-s ... I want to return "ERROR" if the user put some incorrect value , for example (convert "23asb4" "b5" "9") Thanks

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  • Scheme Function to reverse elements of list of 2-list

    - by sudhirc
    This is an exercise from EOPL. Procedure (invert lst) takes lst which is a list of 2-lists and returns a list with each 2-list reversed. (define invert (lambda (lst) (cond((null? lst ) '()) ((= 2 (rtn-len (car lst))) ( cons(swap-elem (car lst)) (invert (cdr lst)))) ("List is not a 2-List")))) ;; Auxiliry Procedure swap-elements of 2 element list (define swap-elem (lambda (lst) (cons (car (cdr lst)) (car lst)))) ;; returns lengh of the list by calling (define rtn-len (lambda (lst) (calc-len lst 0))) ;; calculate length of the list (define calc-len (lambda (lst n) (if (null? lst) n (calc-len (cdr lst) (+ n 1))))) This seems to work however looks very verbose. Can this be shortened or written in more elegant way ? How I can halt the processing in any of the individual element is not a 2-list? At the moment execution proceed to next member and replacing current member with "List is not a 2-List" if current member is not a 2-list.

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  • If item not in the lst in scheme

    - by ms. sakura
    I'm working on context-free grammars, and I have a function that returns the (terminal values of grammar) for example: i have non-terminal function that results in (A B) , from calling say ((A cat) (B happy np) (A B sad)) so technically A and B are non terminals of the grammar. Now I want to be able to get the terminals (cat happy np sad) (define terminals (lambda (lsts) (cond ((null? lsts) lsts) ((not(member? (car(car lsts)) (n-terminals lsts))) (cons (car(car lsts)) (terminals (car (cdr lsts))))) (else (terminals (cdr lsts)))))) PS: functionality of n-terminals is described above. member? is a boolean function that returns true if an item is a member of the list, false otherwise. My function returns an empty lst. What am I missing here?

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  • Multiple URL's going to same page - Kosher for Google?

    - by Ashoka15
    I hear conflicting answers from people about this, and I'm a developer by trade, and my SEO knowledge is not what it should be. Here's my situation: I run a website that lists hotels, restaurants, bars, shops, etc for a small Asian beach town. Lots of establishments here are hotels with a restaurant and bar, as well as restaurants that are also bars. As en example, a Mexican restaurant that also functions as a full cocktail bar. I first set it up so each establishment has one page, but can create multiple pages based on their other areas of business. This forces people to create TWO listings under the same name, and most just add the exact same information onto each page, making things redundant. I am re-arranging the database so that a establishment has only ONE listing (one unique page referenced by the unique code '12345ABCDEF') that is accessible from browsing under "Restaurants" and "Bars", and has the URL structures: site.com/dining/mexican/12345ABCDEF/business-name.html site.com/bars/cocktail_bars/12345ABCDEF/business-name.html I could easily simplify the URL to just the unique code and name: site.com/12345ABCDEF/business-name.html But, I found that Google has parsed by URL structure and lists like this on their SERP: Home > Dining > Mexican With each pointing to the default page for homepage, restaurants and Mexican restaurants. If I simplify the URL structure, will I lose these associations? Could Google also be picking up this structure from my breadcrumb trail at the top of the page? What is the best way to set up URL's on these pages so I am not penalized by Google for having identical information on two URL's, while still being able to have places show up as they did with the old system?

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  • Finding greatest product of two lists, but keep getting #unspecific

    - by user1787030
    (define (greatest-product lst1 lst2) (define (helper lst addtimes total toacc) (cond ((null? lst) '()) ((= (countatoms lst) 1) (display total)) ((= addtimes (cadr lst)) (helper (cdr lst) 1 total total)) (else (helper lst (+ 1 addtimes) (+ toacc total) toacc)))) (cond ((> (helper lst1 0 0 (car lst1)) (helper lst2 0 0 (car lst2))) (helper lst1 0 0 (car lst1))) ((< (helper lst1 0 0 (car lst1)) (helper lst2 0 0 (car lst2))) (helper lst2 0 0 (car lst2))) ((= (helper lst1 0 0 (car lst1)) (helper lst2 0 0 (car lst2))) (display 'equal)))) Scheme keeps returning back that it cannot perform the procedure with #unspecific Im running it with (display (greatest-product '(1 2 3) '(4 5 6))) (display (greatest-product '(1 2 3) '(1 2 3))) (display (greatest-product '(1 2 3) '())) what is wrong with it? the problem seems to be occurring

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  • Redirect 404 errors without rewriting the URL

    - by Knocks X
    Is it possible to have an erroneous URL remain in the address bar while redirecting the user to a URL within my domain? I want www.domain.com/forum to be the actual site being served in all 404 circumstances but I don't want the referring URL to be rewritten (other than the domain portion, which is being done on the registrar level). This is my current .htaccess RewriteEngine On RedirectMatch permanent ^/$ http://www.domain.com/forum/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule .* http://www.domain.com/forum/ [L,R]

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  • IIS URL Rewrite - Redirect any HTTPS traffic to sub-domain

    - by uniquelau
    We have an interesting hosting environment that dictates all secure traffic must travel over a specific sub domain. E.g. http://secure.domain.com/my-page I'd like to handle this switch using URL Rewrite, i.e. at server level, rather than application level. My cases are: https://secure.domain.com/page = NO CHANGE, remains the same https://domain.com/page = sub-domain inserted, https://secure.domain.com/page https://www.domain.com/page = remove 'www', insert sub-domain In my mind the logic is: INPUT = Full Url = http://www.domain.com/page If INPUT contains HTTPS Then check Full URL, does it contain 'secure'? If YES do nothing, if no add 'secure' If INPUT contains 'www' remove 'www' The certificate is not a wild card (e.g. top level domain) and is issues to: https://secure.domain.com/ The website could also be hosted in a staging environment. E.g. https://secure.environment.domain.com/ I do not have control over 'environment' or 'domain' or the 'tld'. Laurence - Update 1, 19th August So as mentioned below, the trick here is to avoid a redirect loop that could drive anyone well loopy. This is what I propose: One rule to force certain traffic to the secure domain: <rule name="Force 'Umbraco' to secure" stopProcessing="true"> <conditions logicalGrouping="MatchAll"> <add input="{REQUEST_URI}" pattern="^/umbraco/(.+)$" ignoreCase="true" /> <add input="{HTTP_HOST}" negate="true" pattern="^secure\.(.+)$" /> </conditions> <action type="Redirect" url="https://secure.{HTTP_HOST}/{R:0}" redirectType="Permanent" /> </rule> Another rule, that then removes the secure domain, expect for traffic on the secure domain. <rule name="Remove secure, expect for Umbraco" stopProcessing="true"> <match url="(.*)" ignoreCase="true" /> <conditions logicalGrouping="MatchAll"> <add input="{HTTP_HOST}" pattern="^secure\.(.+)$" /> <add input="{REQUEST_URI}" negate="true" pattern="^/umbraco/(.+)$" ignoreCase="true" /> </conditions> <!-- Set Domain to match environment --> <action type="Redirect" url="http://staging.domain.com/{R:0}" appendQueryString="true" redirectType="Permanent" /> </rule> This works for a single directory or group of files, however I've been unable to add additional logic into those two rules. For example you might have 3 folders that need to be secure, I tried adding these as Negate records, but then no redirection happens at all. Hmmm! L

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  • Rewrite URL before passing to proxy Lighttpd

    - by futureelite7
    Hi, I'm trying to setup a reverse proxy in lighttpd, such that all requests (and only those requests) under /mobile/video is redirected to the / directory of a secondary web server. This is pretty easy in apache, but I can't for the life of me figure out how to do so in lighttpd. $HTTP["url"] =~ "^/wsmobile/video/" { url.rewrite-once = ( ".*" => "/test/" ) proxy.server = ( "" => ( ( "host" => "210.200.144.26", "port" => 9091 ) ) ) } I've tried using the http["url"] directive, but lighttpd simply ignore those requests and continue to pass the full url to the secondary server, which of course chokes and throws 404s. However, if I do a global rewrite then everything gets forwarded to the secondary server, which is also not what I want. How do I go about this task?

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  • Custom url rewrite stop working after 20 seconds?

    - by 101224863727594634919
    Hi all I have a simple question about using of custom URL rewrite module - http://weblogs.asp.net/scottgu/archive/2007/02/26/tip-trick-url-rewriting-with-asp-net.aspx. After period of time redirects stop working. When I trace non working requests I found that -URL_CACHE_ACCESS_END PhysicalPath URLInfoFromCache true URLInfoAddedToCache false ErrorCode 0 ErrorCode The operation completed successfully. (0x0) Is there any option to disable URL cache access for website. Thanks in advance.

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  • .htaccess URL rewrite to multi-parameter item

    - by MrCS
    I just spent the last 10 hours of my life on this & am running in circles, so was hoping someone may be able to help me. I want a specific URL to load like this: http://example.com/f/2011/image.png?attribute=small When a URL in a format such as this hits, I'd like to rewrite it to hit the server as: http://example.com/generate.php?f=2011/image.png&attribute=small Based on above, my question is two-fold: How can I rewrite the URL in htaccess to meet my requirements above? If the original URL didn't have the attribute query string parameter, how can I ensure attribute will be false/blank/etc when it hits the server via htaccess?

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  • UIWebView not loading URL when URL is passed from UITableView

    - by Mark Hazlett
    Hey Everyone, So i'm building a webView into my application to show the contents of a URL that I am passing from a selection in a UITableView. I know the UIWebView is loading content properly because if you hard code say http://www.google.ca into the NSURL then it loads fine, however when I'm passing the URL that I parsed from an RSS feed back from the UITableView it won't load the URL properly. I tried the debugger and the URL is coming out as nil right before I try and parse it, however I can use NSLog to print the value of it out to the console. here's the code in my UIViewController that has my UIWebView #import <UIKit/UIKit.h> @interface ReadFeedWebViewController : UIViewController { NSString *urlToGet; IBOutlet UIWebView *webView; } @property(nonatomic, retain) IBOutlet UIWebView *webView; @property(nonatomic, retain) NSString *urlToGet; @end Here's the code for my implementation's viewDidLoad method... // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; NSLog(@"Url inside Web View Controller - %@", urlToGet); NSURL *url = [NSURL URLWithString:urlToGet]; NSURLRequest *requestObj = [NSURLRequest requestWithURL:url]; [self.webView loadRequest:requestObj]; } Once again, I can print the URL to NSLog fine and if I hard code the URL into the NSURL object then it will load fine in the UIWebView. Here is where I'm setting the value in my UITableViewController... - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { ReadFeedWebViewController *extendedView = [[ReadFeedWebViewController alloc] init]; int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1]; extendedView.urlToGet = [[stories objectAtIndex: storyIndex] objectForKey:@"link"]; //NSLog([[stories objectAtIndex: storyIndex] objectForKey:@"summary"]); NSLog([[stories objectAtIndex: storyIndex] objectForKey:@"link"]); [self.navigationController pushViewController:extendedView animated:YES]; [extendedView release]; } However, since I can print the value using NSLog in the extendedView view controller I know it's being passed properly. Cheers

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  • url encoded forward slashes breaking my codeigniter app

    - by Ian Cook
    i’m trying to create a url string that works like this: /app/process/example.com/index.html so in other words, /app/process/$URL i then retrieve the url with $this->uri->segment(3); the forward slashes in the URL will of course be a problem accessing uri segments, so i’ll go ahead and url encode the URL portion: /app/process/example.com%2Findex.html .. but now I just get a 404 saying ... Not Found The requested URL /app/process/example.com/index.html was not found on this server. it appears that my url encoding of forward slashes breaks CI’s URI parser. what can i do to get around this problem?

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  • handleOpenURL not called using a custom url schema in iPhone OS

    - by favo
    Hi, I have successfuly added my own url schemes to my App. The App correctly launches using the schemes. Now I want to handle the incoming data but the delegate is not called. It is an universal app and I have added the following function to both AppDelegates: - (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url { if (!url) { return NO; } NSString *URLString = [url absoluteString]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"test message", nil) message:URLString delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alert show]; [alert release]; return YES; } I am testing with a schema like: myapp://appalarm.com …and would expect to be appalarm.com in the URLString What is wrong with it? Thanks for your responses!

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