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  • How can i get rid of 0xFEEFEE in VC

    - by egebilmuh
    Hi guys I m programming C for an assingment in VC++ 2008. I simulate adjList for graph implementation. i can readly add edge between two vertex and print the graph. and i want to remove edge between two vertex and print the graph again. whatever i do,i cant print the graph after deleting the edge. i get 0xfeefee :( what is this? and how can i resolve this program. my delete function and print the graph function are illustrated below. void deleteEdge(Graph G, Vertex V, Vertex W) { Edge list,prev,temp; list=V->list; prev=NULL; // while(list!=NULL && list->to->value!=W->value){ prev=list; list=list->next; } // have found the element. if(list!=NULL){ temp=list; // if first element of list is deleted. if(prev==NULL) list=list->next; else prev->next=list->next; // reallocate. free(temp); } } void GRAPHprint(Graph G) { Vertex tmp; Edge list; for(tmp = G->head;tmp!=NULL;tmp=tmp->next) { fprintf(stdout,"V:%d\t",tmp->value); list=tmp->list; while(list!=NULL) { fprintf(stdout,"%d\t",list->to->value); list=list->next; } fprintf(stdout, "\n"); } system("pause"); }

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  • What is a fast way to set debugging code at a given line in a function?

    - by Josh O'Brien
    Preamble: R's trace() is a powerful debugging tool, allowing users to "insert debugging code at chosen places in any function". Unfortunately, using it from the command-line can be fairly laborious. As an artificial example, let's say I want to insert debugging code that will report the between-tick interval calculated by pretty.default(). I'd like to insert the code immediately after the value of delta is calculated, about four lines up from the bottom of the function definition. (Type pretty.default to see where I mean.) To indicate that line, I need to find which step in the code it corresponds to. The answer turns out to be step list(c(12, 3, 3)), which I zero in on by running through the following steps: as.list(body(pretty.default)) as.list(as.list(body(pretty.default))[[12]]) as.list(as.list(as.list(body(pretty.default))[[12]])[[3]]) as.list(as.list(as.list(body(pretty.default))[[12]])[[3]])[[3]] I can then insert debugging code like this: trace(what = 'pretty.default', tracer = quote(cat("\nThe value of delta is: ", delta, "\n\n")), at = list(c(12,3,3))) ## Try it a <- pretty(c(1, 7843)) b <- pretty(c(2, 23)) ## Clean up untrace('pretty.default') Questions: So here are my questions: Is there a way to print out a function (or a parsed version of it) with the lines nicely labeled by the steps to which they belong? Alternatively, is there another easier way, from the command line, to quickly set debugging code for a specific line within a function? Addendum: I used the pretty.default() example because it is reasonably tame, but with real/interesting functions, repeatedly using as.list() quickly gets tiresome and distracting. Here's an example: as.list(as.list(as.list(as.list(as.list(as.list(as.list(as.list(as.list(body(# model.frame.default))[[26]])[[3]])[[2]])[[4]])[[3]])[[4]])[[4]])[[4]])[[3]]

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  • What's the right way to do mutable data structures (e.g., skip lists, splay trees) in F#?

    - by dan
    What's a good way to implement mutable data structures in F#? The reason I’m asking is because I want to go back and implement the data structures I learned about in the algorithms class I took this semester (skip lists, splay trees, fusion trees, y-fast tries, van Emde Boas trees, etc.), which was a pure theory course with no coding whatsoever, and I figure I might as well try to learn F# while I’m doing it. I know that I “should” use finger trees to get splay tree functionality in a functional language, and that I should do something with laziness to get skip-list functionality, etc. , but I want to get the basics nailed down before I try playing with purely functional implementations. There are lots of examples of how to do functional data structures in F#, but there isn’t much on how to do mutable data structures, so I started by fixing up the doubly linked list here into something that allows inserts and deletes anywhere. My plan is to turn this into a skip list, and then use a similar structure (discriminated union of a record) for the tree structures I want to implement. Before I start on something more substantial, is there a better way to do mutable structures like this in F#? Should I just use records and not bother with the discriminated union? Should I use a class instead? Is this question "not even wrong"? Should I be doing the mutable structures in C#, and not dip into F# until I want to compare them to their purely functional counterparts? And, if a DU of records is what I want, could I have written the code below better or more idiomatically? It seems like there's a lot of redundancy here, but I'm not sure how to get rid of it. module DoublyLinkedList = type 'a ll = | None | Node of 'a ll_node and 'a ll_node = { mutable Prev: 'a ll; Element : 'a ; mutable Next: 'a ll; } let insert x l = match l with | None -> Node({ Prev=None; Element=x; Next=None }) | Node(node) -> match node.Prev with | None -> let new_node = { Prev=None; Element=x; Next=Node(node)} node.Prev <- Node(new_node) Node(new_node) | Node(prev_node) -> let new_node = { Prev=node.Prev; Element=x; Next=Node(node)} node.Prev <- Node(new_node) prev_node.Next <- Node(new_node) Node(prev_node) let rec nth n l = match n, l with | _,None -> None | _,Node(node) when n > 0 -> nth (n-1) node.Next | _,Node(node) when n < 0 -> nth (n+1) node.Prev | _,Node(node) -> Node(node) //hopefully only when n = 0 :-) let rec printLinkedList head = match head with | None -> () | Node(x) -> let prev = match x.Prev with | None -> "-" | Node(y) -> y.Element.ToString() let cur = x.Element.ToString() let next = match x.Next with | None -> "-" | Node(y) -> y.Element.ToString() printfn "%s, <- %s -> %s" prev cur next printLinkedList x.Next

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  • Losing data after reading them correct from file

    - by user1388172
    i have the fallowing class of object with a class a data structure which i use in main combined. The ADT(abstract data type) is a linked list. After i read from file the input data and create and object which at print looks just fine after a print. after i push_back() the 3-rd int variable get initializated to 0. So example and code: Example: ex.in: 1 7 31 2 2 2 3 3 3 now i create objects from each line, which at print look as they suppose, but after push_back(): 1 7 0 2 2 0 3 3 0 Class.h: class RAngle { private: int x,y,l,b; public: int solution,prec; RAngle(){ x = y = solution = prec = b = l =0; } RAngle(int i,int j,int k){ x = i; y = j; l = k; solution = 0; prec=0; b=0; } friend ostream& operator << (ostream& out, const RAngle& ra){ out << ra.x << " " << ra.y << " " << ra.l <<endl; return out; } friend istream& operator >>( istream& is, RAngle& ra){ is >> ra.x; is >> ra.y; is >> ra.l; return is ; } }; ADT.h: template <class T> class List { private: struct Elem { T data; Elem* next; }; Elem* first; T pop_front(){ if (first!=NULL) { T aux = first->data; first = first->next; return aux; } T a; return a; } void push_back(T data){ Elem *n = new Elem; n->data = data; n->next = NULL; if (first == NULL) { first = n; return ; } Elem *current; for(current=first;current->next != NULL;current=current->next); current->next = n; } Main.cpp(after i call this function in main which prints object as they suppose to be the x var(from RAngle class) changes to 0 in all cases.) void readData(List <RAngle> &l){ RAngle r; ifstream f_in; f_in.open("ex.in",ios::in); for(int i=0;i<10;++i){ f_in >> r; cout << r; l.push_back(r); }

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  • Doubly linked lists

    - by user1642677
    I have an assignment that I am terribly lost on involving doubly linked lists (note, we are supposed to create it from scratch, not using built-in API's). The program is supposed to keep track of credit cards basically. My professor wants us to use doubly-linked lists to accomplish this. The problem is, the book does not go into detail on the subject (doesn't even show pseudo code involving doubly linked lists), it merely describes what a doubly linked list is and then talks with pictures and no code in a small paragraph. But anyway, I'm done complaining. I understand perfectly well how to create a node class and how it works. The problem is how do I use the nodes to create the list? Here is what I have so far. public class CardInfo { private String name; private String cardVendor; private String dateOpened; private double lastBalance; private int accountStatus; private final int MAX_NAME_LENGTH = 25; private final int MAX_VENDOR_LENGTH = 15; CardInfo() { } CardInfo(String n, String v, String d, double b, int s) { setName(n); setCardVendor(v); setDateOpened(d); setLastBalance(b); setAccountStatus(s); } public String getName() { return name; } public String getCardVendor() { return cardVendor; } public String getDateOpened() { return dateOpened; } public double getLastBalance() { return lastBalance; } public int getAccountStatus() { return accountStatus; } public void setName(String n) { if (n.length() > MAX_NAME_LENGTH) throw new IllegalArgumentException("Too Many Characters"); else name = n; } public void setCardVendor(String v) { if (v.length() > MAX_VENDOR_LENGTH) throw new IllegalArgumentException("Too Many Characters"); else cardVendor = v; } public void setDateOpened(String d) { dateOpened = d; } public void setLastBalance(double b) { lastBalance = b; } public void setAccountStatus(int s) { accountStatus = s; } public String toString() { return String.format("%-25s %-15s $%-s %-s %-s", name, cardVendor, lastBalance, dateOpened, accountStatus); } } public class CardInfoNode { CardInfo thisCard; CardInfoNode next; CardInfoNode prev; CardInfoNode() { } public void setCardInfo(CardInfo info) { thisCard.setName(info.getName()); thisCard.setCardVendor(info.getCardVendor()); thisCard.setLastBalance(info.getLastBalance()); thisCard.setDateOpened(info.getDateOpened()); thisCard.setAccountStatus(info.getAccountStatus()); } public CardInfo getInfo() { return thisCard; } public void setNext(CardInfoNode node) { next = node; } public void setPrev(CardInfoNode node) { prev = node; } public CardInfoNode getNext() { return next; } public CardInfoNode getPrev() { return prev; } } public class CardList { CardInfoNode head; CardInfoNode current; CardInfoNode tail; CardList() { head = current = tail = null; } public void insertCardInfo(CardInfo info) { if(head == null) { head = new CardInfoNode(); head.setCardInfo(info); head.setNext(tail); tail.setPrev(node) // here lies the problem. tail must be set to something // to make it doubly-linked. but tail is null since it's // and end point of the list. } } } Here is the assignment itself if it helps to clarify what is required and more importantly, the parts I'm not understanding. Thanks https://docs.google.com/open?id=0B3vVwsO0eQRaQlRSZG95eXlPcVE

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  • Windows phone 7 grouped list

    - by Luke Lowrey
    I am new to silverlight and windows phone 7 development and am having some trouble working out the best way to do a "grouped list". Essentially what I would like to do is group a list of event details by date into something like this: Monday 5/6/10 event 1 event 2 Tuesday 6/6/10 event 3 I tried using nested listboxes which work to certain extent but killed the scrolling. Is that the best way to do grouping (assuming I can fix the scrolling issue) or is there some other method?

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  • ContentType DocumentTemplate not found in a List

    - by Rich Bennema
    I have the following Feature: <?xml version="1.0" encoding="utf-8"?> <Feature Id="9A3C5D02-A2EB-4725-97F7-CDA6DE319F1B" Title="My Custom Types" Scope="Site" DefaultResourceFile="core" Hidden="TRUE" xmlns="http://schemas.microsoft.com/sharepoint/"> <ElementManifests> <ElementManifest Location="Elements.xml" /> <ElementFile Location="templates/MeetingMinutes.docx" /> </ElementManifests> </Feature> Which contains the following Elements.xml: <?xml version="1.0" encoding="utf-8"?> <Elements xmlns="http://schemas.microsoft.com/sharepoint/"> <Module Name="Templates" Url="_cts/Meeting Minutes" Path="templates" RootWebOnly="TRUE"> <File Url="MeetingMinutes.docx" Type="Ghostable" /> </Module> <ContentType ID="0x01010066DD088A6B8B46BCA775CCD119FBB3E8" Name="Meeting Minutes" Group="Custom Content Types" Version="0"> <FieldRefs /> <DocumentTemplate TargetName="MeetingMinutes.docx"/> </ContentType> </Elements> I then use this ContentType within a custom List Template. I deploy the solution, activate the feature, and create an instance of the List Template. I go into the library and select Settings Document Library Settings Content Types: Meeting Minutes Parent: Meeting Minutes Advanced settings. I'm now in the Advance Settings of the Site Content Type. The URL of the existing document template is MeetingMinutes.docx and there is an (Edit Template) link which points to http://myserver/sites/testsite/_cts/Meeting%20Minutes/MeetingMinutes.docx. Everything's shiny. But, I hit the back button two times so I'm back in the settings of the List Content Type. This time when I click Advance settings, the URL of the existing document template is still MeetingMinutes.docx, but there is no (Edit Template) link. Troubling. Pressing on, I go back to AllItems.aspx and click New Meeting Minutes. As Word is loading, I see a little Opening dialog which says, Opening: http://myserver/sites/testsite/Shared%20Documents/Forms/Document/MeetingMinutes.docx, to which Word responds: "Word was unable to read this document. It may be corrupt." So the Document Template works correctly in the Site Content Type (where it does me no good), but is not working in the List Content Type (where I really need it). Now, I know I could put this in _layouts, but from what I've read, _cts is the way to do it. What am I doing wrong?

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  • Python: List of Modules (>>> help('modules') not working)

    - by Dan
    I wanted a list of my modules and was told: >>> help('modules') Would do the trick. But I just get Please wait a moment while I gather a list of all available modules... For over 10 minutes before I killed it. Anyone know what could be causing this? Or how I could otherwise see my modules? (System Ubuntu 9.10/Python 2.6.4) Thanks, Dan

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  • Linq Distinct on list

    - by BahaiResearch.com
    I have a list like this: List people age name 1 bob 1 sam 7 fred 7 tom 8 sally I need to do a linq query on people and get an int of the number distinct ages (3) int distinctAges = people.SomeLinq(); how? how?

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  • Magento: Display sub-category list

    - by Neil Bradley
    Hi there, I'm building a Magento store and want to be able to display a list of categories and have each category link to its own page. I have a 'Brands' category with an ID of 42 and I want to display a list of the sub-categories and ensure that each one links to the designated URL key in the CMS. Has anyone had experience of doing this with Magento? Thank you.

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  • Updated list of refactoring support for different IDEs

    - by Vargen
    Does anyone know of an updated list of refactoring support for different IDEs? How many of Fowlers refactorings have tool support in popular IDEs? And does any IDE use code smells to any greater extent? I guess one would have to use addons for some IDEs, so even if i did find an updated list of refactoring support for say Eclipse, that would probably not be representative.

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  • Whois list of Top Level Domain against their corresponding registrar

    - by Daniel
    I'm trying to find a list of TLD's to their corresponding whois server, for example .com americanWhoisServer .net someOtherWhoisServer .au australianWhoisServer In the end i'm aiming for something like a Dictionary where the key is the TLD and the value is the whois server address (eg whois.apnic.net). Ah snap, i just realised that i am given the IP addresses and not domain names but a list could still come in handy. How can i determine which whois server to use given a IP address? Guess and check?

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  • Converting List<String> to String[] in Java

    - by Christian
    How do I convert a list into an array? The following code returns an error. public static void main(String[] args) { List<String> strlist = new ArrayList<String>(); strlist.add("sdfs1"); strlist.add("sdfs2"); String[] strarray = (String[]) strlist.toArray(); System.out.println(strarray); }

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  • dataset to List<T>using linq

    - by bharat
    I have the dataset and I want to convert the dataset into List<T> T - type object How do I do it my dataset? It has 10 columns, with all 10 properties my object has and it's returning over 15000 rows. I want to return that dataset into List<obj> and loop it how do I do that?

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  • Collect a list in JS with regex?

    - by acidzombie24
    Basically i want to output a div with all the ids in it. I know how to do that especially with jquery but collecting the ids is the problem not the list. I failed at regex although i know how to use it in .NET. How do i write this regex properly? so i can get a list of ids and display it as i want. http://jsfiddle.net/NgmGf/

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  • Difference between the List and Enumeration

    - by harigm
    I have a written a method to get all the records and return in the List Type, but I got out of memory error. So I changed return type from List to Enumeration, in the method, instead of ArrayList, uses Vector and return vector.elements at the end of the method. It works without any error. but I did not understand why. Could someone explain Why this Enumeration worked?

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  • List as a key to a dictionary

    - by williamx
    Let's say I have a list: a = ['apple', 'orange'] and a dictionary: d ={'apple': [2,4], 'carrot': [44,33], 'orange': [345,667]} How can I use the list a as a key to lookup in the dictionary d? I want the result to be written to a comma-separated textfile like this apple, orange 2, 44 4, 33

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  • How to access current item from a sharepoint list in Visual Studio 2010

    - by Damir
    Hello, When using sharepoint designer you can quite easily use current item and perform different actions with it when using workflows etc. However, the options available are limited. I am wondering how to access current item in a list through visual studio 2010 and use and assign values from its fields to variables or items in another list automatically using C# code. Any help would be most appreciated. Thanks

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  • List All Google Map Marker Images

    - by Dau Thanh Hai
    Do you often use image marker from google or copy it to your server? Where I can get all images list of available markers from google? The list of images such as : http://maps.gstatic.com/intl/en_ALL/mapfiles/dd-end.png http://maps.gstatic.com/intl/en_ALL/mapfiles/dd-start.png

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  • List to CSV in Python

    - by Steve
    Hi, I am creating a CSV from a list of values. CSV File gets created but the csv is formed as a single column. Actually it should be multiple rows with multiple columns, instead it forms as a multiple rows with a single column. I am using the following code from random import choice import csv fileObject = csv.writer(open('Insurance.csv','w'),dialect='excel',delimiter=' ') for i in range(0,175): current_list = list(choice(master_list)) fileObject.writerows(current_list) current_list = [] Thanks

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