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  • What is the relaxation condition in graph theory

    - by windopal
    Hi, I'm trying to understand the main concepts of graph theory and the algorithms within it. Most algorithms seem to contain a "Relaxation Condition" I'm unsure about what this is. Could some one explain it to me please. An example of this is dijkstras algorithm, here is the pseudo-code. 1 function Dijkstra(Graph, source): 2 for each vertex v in Graph: // Initializations 3 dist[v] := infinity // Unknown distance function from source to v 4 previous[v] := undefined // Previous node in optimal path from source 5 dist[source] := 0 // Distance from source to source 6 Q := the set of all nodes in Graph // All nodes in the graph are unoptimized - thus are in Q 7 while Q is not empty: // The main loop 8 u := vertex in Q with smallest dist[] 9 if dist[u] = infinity: 10 break // all remaining vertices are inaccessible from source 11 remove u from Q 12 for each neighbor v of u: // where v has not yet been removed from Q. 13 alt := dist[u] + dist_between(u, v) 14 if alt < dist[v]: // Relax (u,v,a) 15 dist[v] := alt 16 previous[v] := u 17 return dist[] Thanks

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  • java palindrome help

    - by jdbeverly87
    I'm creating a program that checks if a word or phrase is a palindrome. I have the actual "palindrome tester" figured out. What I'm stuck with is where and what to place in my code to have the console read out "Enter palindrome..." and then text. I've tried with IO but it doesnt work out right. Also, how do I create a loop to keep going? This code only allows one at a time `public class Palindrome { public static void main(String args[]) { String s=""; int i; int n=s.length(); String str=""; for(i=n-1;i>=0;i--) str=str+s.charAt(i); if(str.equals(s)) System.out.println(s+ " is a palindrome"); else System.out.println(s+ " is not a palindrome"); } }

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  • Convert var to DataTable

    - by cre-johnny07
    I have var item which I want to convert in to a Datatable. How can I do this. var items = (from myObj in this.Context.Orders group myObj by myObj.OrderDate.ToString("yyyy-mm") into ymGroup select new { Date = ymGroup.Key, Start = ymGroup.Min(c => c.OrderId), End = ymGroup.Max(c => c.OrderId) }); I need to convert the items into a DataTable. I don't want to use any foreach loop. How can I do this.?

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  • VBA/SQL recordsets

    - by intruesiive
    The project I'm asking about is for sending an email to teachers asking what books they're using for the classes they're teaching next semester, so that the books can be ordered. I have a query that compares the course number of this upcoming semester's classes to the course numbers of historical textbook orders, pulling out only those classes that are being taught this semester. That's where I get lost. I have a table that contains the following: -Professor -Course Number -Year -Book -Title The data looks like this: professor year course number title smith 13 1111 Pride and Prejudice smith 13 1111 The Fountainhead smith 13 1222 The Alchemist smith 12 1111 Pride and Prejudice smith 11 1222 Infinite Jest smith 10 1333 The Bible smith 13 1333 The Bible smith 12 1222 The Alchemist smith 10 1111 Moby Dick johnson 12 1222 The Tipping Point johnson 11 1333 Anna Kerenina johnson 10 1333 Everything is Illuminated johnson 12 1222 The Savage Detectives johnson 11 1333 In Search of Lost Time johnson 10 1333 Great Expectations johnson 9 1222 Proust on the Shore Here's what I need the code to do "on paper": Group the records by professor. Determine every unique course number in that group, and group records by course number. For each unique course number, determine the highest year associated. Then spit out every record with that professor+course number+year combination. With the sample data, the results would be: professor year course number title smith 13 1111 Pride and Prejudice smith 13 1111 The Fountainhead smith 13 1222 The Alchemist smith 13 1333 The Bible johnson 12 1222 The Tipping Point johnson 11 1333 Anna Kerenina johnson 12 1222 The Savage Detectives johnson 11 1333 In Search of Lost Time I'm thinking I should make a record set for each teacher, and within that, another record set for each course number. Within the course number record set, I need the system to determine what the highest year number is - maybe store that in a variable? Then pull out every associated record so that if the teacher ordered 3 books the last time they taught that class (whether it was in 2013 or 2012 and so on) all three books display. I'm not sure I'm thinking of record sets in the right way, though. My SQL so far is basic and clearly doesn't work: SELECT [All].Professor, [All].Course, Max([All].Year) FROM [All] GROUP BY [All].Professor, [All].Course; Thanks for your help.

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  • vbscript calling svnadmin dump

    - by Dexton
    Hi, Running the following vbscript to call svnadmin dump fails (i.e. no dump is being created) Set objShell = CreateObject("WScript.Shell") Set objShellExec = objShell.Exec("svnadmin dump C:\svn_repos > C:\fullbackup") I discovered from another post, http://stackoverflow.com/questions/445121/svn-dump-fails-with-wscript-shell/2400011#2400011 that i had to create a new command interpreter using cmd as follows: Set objShellExec = objShell.Exec("%comspec% /c" & "svnadmin dump C:\svn_repos > C:\fullbackup") This successfully created the dump but I could never read the output information (i.e. * Dumped revision 100. * Dumped revision 101. etc). I tried Do While objWshScriptExec.Status = 0 Wscript.Echo objShellExec.StdOut.Readline Wscript.Echo objShellExec.StdErr.Readline WScript.Sleep 100 Loop but nothing ever gets displayed. May I know how i can read the output information and also why I needed to create a new command interpreter using "%comspec% /c" before the svnadmin dump command would execute correctly? Thanks. Regards, Dexton

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  • Few Google Checkout Questions

    - by Richard Knop
    I am planning to integrate a Google Checkout payment system on a social networking website. The idea is that members can buy "tokens" for real money (which are sort of the website currency) and then they can buy access to some extra content on the website etc. What I want to do is create a Google Checkout button that takes a member to the checkout page where he pays with his credit or debit card. What I want is the Google Checkout to notify notify my server whether the purchase of tokens was successful (if the credit/debit card was charged) so I can update the local database. The website is coded in PHP/MySQL. I have downloaded the sample PHP code from here: code.google.com/p/google-checkout-php-sample-code/wiki/Documentation I know how to create a Google checkout button and I have also placed the responsehandlerdemo.php file on my server. This is the file the Google Checkout is supposed to send response to (of course I set the path to the file in Google merchant account). Now in the response handler file there is a switch block with several case statements. Which one means that the payment was successful and I can add tokens to the member account in the local database? switch ($root) { case "request-received": { break; } case "error": { break; } case "diagnosis": { break; } case "checkout-redirect": { break; } case "merchant-calculation-callback": { // Create the results and send it $merchant_calc = new GoogleMerchantCalculations($currency); // Loop through the list of address ids from the callback $addresses = get_arr_result($data[$root]['calculate']['addresses']['anonymous-address']); foreach($addresses as $curr_address) { $curr_id = $curr_address['id']; $country = $curr_address['country-code']['VALUE']; $city = $curr_address['city']['VALUE']; $region = $curr_address['region']['VALUE']; $postal_code = $curr_address['postal-code']['VALUE']; // Loop through each shipping method if merchant-calculated shipping // support is to be provided if(isset($data[$root]['calculate']['shipping'])) { $shipping = get_arr_result($data[$root]['calculate']['shipping']['method']); foreach($shipping as $curr_ship) { $name = $curr_ship['name']; //Compute the price for this shipping method and address id $price = 12; // Modify this to get the actual price $shippable = "true"; // Modify this as required $merchant_result = new GoogleResult($curr_id); $merchant_result->SetShippingDetails($name, $price, $shippable); if($data[$root]['calculate']['tax']['VALUE'] == "true") { //Compute tax for this address id and shipping type $amount = 15; // Modify this to the actual tax value $merchant_result->SetTaxDetails($amount); } if(isset($data[$root]['calculate']['merchant-code-strings'] ['merchant-code-string'])) { $codes = get_arr_result($data[$root]['calculate']['merchant-code-strings'] ['merchant-code-string']); foreach($codes as $curr_code) { //Update this data as required to set whether the coupon is valid, the code and the amount $coupons = new GoogleCoupons("true", $curr_code['code'], 5, "test2"); $merchant_result->AddCoupons($coupons); } } $merchant_calc->AddResult($merchant_result); } } else { $merchant_result = new GoogleResult($curr_id); if($data[$root]['calculate']['tax']['VALUE'] == "true") { //Compute tax for this address id and shipping type $amount = 15; // Modify this to the actual tax value $merchant_result->SetTaxDetails($amount); } $codes = get_arr_result($data[$root]['calculate']['merchant-code-strings'] ['merchant-code-string']); foreach($codes as $curr_code) { //Update this data as required to set whether the coupon is valid, the code and the amount $coupons = new GoogleCoupons("true", $curr_code['code'], 5, "test2"); $merchant_result->AddCoupons($coupons); } $merchant_calc->AddResult($merchant_result); } } $Gresponse->ProcessMerchantCalculations($merchant_calc); break; } case "new-order-notification": { $Gresponse->SendAck(); break; } case "order-state-change-notification": { $Gresponse->SendAck(); $new_financial_state = $data[$root]['new-financial-order-state']['VALUE']; $new_fulfillment_order = $data[$root]['new-fulfillment-order-state']['VALUE']; switch($new_financial_state) { case 'REVIEWING': { break; } case 'CHARGEABLE': { //$Grequest->SendProcessOrder($data[$root]['google-order-number']['VALUE']); //$Grequest->SendChargeOrder($data[$root]['google-order-number']['VALUE'],''); break; } case 'CHARGING': { break; } case 'CHARGED': { break; } case 'PAYMENT_DECLINED': { break; } case 'CANCELLED': { break; } case 'CANCELLED_BY_GOOGLE': { //$Grequest->SendBuyerMessage($data[$root]['google-order-number']['VALUE'], // "Sorry, your order is cancelled by Google", true); break; } default: break; } switch($new_fulfillment_order) { case 'NEW': { break; } case 'PROCESSING': { break; } case 'DELIVERED': { break; } case 'WILL_NOT_DELIVER': { break; } default: break; } break; } case "charge-amount-notification": { //$Grequest->SendDeliverOrder($data[$root]['google-order-number']['VALUE'], // <carrier>, <tracking-number>, <send-email>); //$Grequest->SendArchiveOrder($data[$root]['google-order-number']['VALUE'] ); $Gresponse->SendAck(); break; } case "chargeback-amount-notification": { $Gresponse->SendAck(); break; } case "refund-amount-notification": { $Gresponse->SendAck(); break; } case "risk-information-notification": { $Gresponse->SendAck(); break; } default: $Gresponse->SendBadRequestStatus("Invalid or not supported Message"); break; } I guess that case 'CHARGED' is the one, am I right? Second question, do I need an SSL certificate to receive response from Google Checkout? According to this I do: groups.google.com/group/google-checkout-api-php/browse_thread/thread/10ce55177281c2b0 But I don's see it mentioned anywhere in the official documentation. Thank you.

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  • Sending Facebook notifications

    - by antpaw
    Hey i have a little facebook iframe application written with rails and the facebooker plugin. I can loop through the users friends and see whether they also have this application. To do this I use a fql qeury, and my own html (no fbml). Now i want to create a button right beside every friend who doesn't have this app, that sends an invite massage. Is it possible to do this without this FBML/JS voodoo? I looked through the RESTful api but the only thing i could found was this deprecated method :( Can someone provide me an code example on how to do this? I really don't want to use this FBML stuff because it doesn't fit into the ui concept of the app, but if that the only way, please explain how to do this (every fbml tag I've tried is just invisible :( ) Thanks a lot.

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  • Help me finish this Python self-challenge.

    - by Hamish Grubijan
    This is not a homework. I saw this article praising Linq library and how great it is for doing combinatorics stuff, and I thought to myself: Python can do it in a more readable fashion. After half hour of dabbing with Python I failed. Please finish where I left off. Also, do it in the most Pythonic and efficient way possible please. from itertools import permutations from operator import mul from functools import reduce glob_lst = [] def divisible(n): return (sum(j*10^i for i,j in enumerate(reversed(glob_lst))) % n == 0) oneToNine = list(range(1, 10)) twoToNine = oneToNine[1:] for perm in permutations(oneToNine, 9): for n in twoToNine: glob_lst = perm[1:n] #print(glob_lst) if not divisible(n): continue else: # Is invoked if the loop succeeds # So, we found the number print(perm) Thanks!

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  • problem creating object "wscript.shell"

    - by sushant
    my script looks like: Dim WshShell, oExec Set WshShell = CreateObject("WScript.Shell") Set oExec = WshShell.Exec("cmd /c cd D:\d & D: & winzip32.exe -min -a D:\a") Do While oExec.Status = 0 WScript.Sleep 100 Loop WScript.Echo oExec.Status The idea was to use explorer to open these files. The problem I'm having though is on the line: Set WshShell = CreateObject("WScript.Shell") I keep getting the message ActiveX component can't create object: 'WScript.Shell' I'm totally confused because this exact same code runs fine if I write it in a .htm file. Why does my browser treat my .asp page differently than the .html file? How do i fix this problem?

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  • C# GridView dynamically built columns with textboxes ontextchanged

    - by tnriverfish
    My page is a bulk order form that has many products and various size options. I've got a gridview that has a 3 static columns with labels. There are then some dynamically built columns. Each of the dynamically built columns have a textbox in them. The textbox is for quantity. Trying to either update the server with the quantity entered each time a textbox is changed (possibly ontextchanged event) or loop though each of the rows column by column and gather all the items that have a quantity and process those items and their quantities all at once (via button onclick). If I put the process that builds the GridView behind a if(!Page.IsPostBack) then the when a textchanged event fires the gridview only gets the static fields and the dynamic ones are gone. If I remove the if(!Page.IsPostBack) the process to gather and build the page is too heavy on processing and takes too long to render the page again. Some advice would be appreciated. Thanks

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  • Limit a program's execution time in C (Monte Carlo technique)

    - by rrs90
    I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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  • Effective thread Synchronization in C#

    - by n0vic3c0d3r
    I have a scenario where I need to search from many binary files (using keys) and combine the results (strings). Until now, I have been doing it in a for loop one file after the other. foreach (string file in FileSources.Keys) { aggregatedDefinitions.Append(DefinitionLookup(txtSearchWord.Text, file)); } Since this operation is very slow, I was thinking of using threads, so that I could do IO operations in parallel. Is threading the right way to go. If I use threading, how can I ensure that I get the results in the order I want. I haven't used Threading until now. It would be very helpful if you could suggest some materials/books that would help me solve my problem.

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  • filling array gradually with data from user

    - by neville
    I'm trying to fill an array with words inputted by user. Each word must be one letter longer than previous and one letter shorter than next one. Their length is equal to table row index, counting from 2. Words will finally create a one sided pyramid, like : A AB ABC ABCD Scanner sc = new Scanner(System.in); System.out.println("Give the height of array: "); String[] words = new String[height]; for(int i=2; i<height+2; i++){ System.out.println("Give word with "+i+" letters."); words[i-2] = sc.next(); while( words[i-2].length()>i-2 || words[i-2].length()<words[i-3].length() ){ words[i-2] = sc.next(); } } Currently the while loop doesn't influence scanner at all :/

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  • Django MultiWidget Phone Number Field

    - by Birdman
    I want to create a field for phone number input that has 2 text fields (size 3, 3, and 4 respectively) with the common "(" ")" "-" delimiters. Below is my code for the field and the widget, I'm getting the following error when trying to iterate the fields in my form during initial rendering (it happens when the for loop gets to my phone number field): Caught an exception while rendering: 'NoneType' object is unsubscriptable class PhoneNumberWidget(forms.MultiWidget): def __init__(self,attrs=None): wigs = (forms.TextInput(attrs={'size':'3','maxlength':'3'}),\ forms.TextInput(attrs={'size':'3','maxlength':'3'}),\ forms.TextInput(attrs={'size':'4','maxlength':'4'})) super(PhoneNumberWidget, self).__init__(wigs, attrs) def decompress(self, value): return value or None def format_output(self, rendered_widgets): return '('+rendered_widgets[0]+')'+rendered_widgets[1]+'-'+rendered_widgets[2] class PhoneNumberField(forms.MultiValueField): widget = PhoneNumberWidget def __init__(self, *args, **kwargs): fields=(forms.CharField(max_length=3), forms.CharField(max_length=3), forms.CharField(max_length=4)) super(PhoneNumberField, self).__init__(fields, *args, **kwargs) def compress(self, data_list): if data_list[0] in fields.EMPTY_VALUES or data_list[1] in fields.EMPTY_VALUES or data_list[2] in fields.EMPTY_VALUES: raise fields.ValidateError(u'Enter valid phone number') return data_list[0]+data_list[1]+data_list[2] class AdvertiserSumbissionForm(ModelForm): business_phone_number = PhoneNumberField(required=True)

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  • InvalidCastException when creating an instance using assembly.CreateInstance

    - by Yossi Dahan
    I'm looking for an explanation for the following - I have an assembly I'm loading using Assembly assembly = Assembly.LoadFrom(filename); I then loop on all the types in the assembly, and wish to try and find out if a type implements a particular interface and if so I want an instance of that type, I've tried several things which did not work, but when I fell back to the most basic (and probably inefficient) way, I realised there's something more fundamental I don't understand - foreach (Type t in assembly.GetTypes()) { foreach (Type i in t.GetInterfaces()) { if (i.FullName == pluginInterfaceType.FullName) { object o = assembly.CreateInstance(t.ToString()); IInterface plugin = (IInterface)o; That last line causes an InvalidCastException, despite the fact that the type created definitely implements that interface. Further more - if I use Activator.CreateInstance instead of Assembly.CreateInstance (which I don't want to do), casting to the interface works just fine.

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  • HTMLAgilityPack ChildNodes index works, named node does not

    - by XgenX
    I am parsing an XML API response with HTMLAgilityPack. I am able to select the result items from the API call. Then I loop through the items and want to write the ChildNodes to a table. When I select ChildNodes by saying something like: sItemId = dnItem.ChildNodes(0).innertext I get the proper itemId result. But when I try: sItemId = dnItem.ChildNodes("itemId").innertext I get "Referenced object has a value of 'Nothing'." I have tried "itemID[1]", "/itemId[1]" and a veriety of strings. I have tried SelectSingleNode and ChildNodes.Item("itemId").innertext. The only one that has worked is using the index. The problem with using the index is that sometimes child elements are omitted in the results and that throw off the index. Anybody know what I am doing wrong?

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  • Using Regex.Replace() to replace text in a string

    - by aspdotnetuser
    Hi, I want to use Regex.Replace() to loop through a string containing words that are separated by '//' to check if any of the words match a string value which has been passed to the method. Here's my code at the moment: public void CheckText(string text) { //Check text entered by user string wordList = "word1//word2//word3 etc..."; string replaceString = "matched"; if (!string.IsNullOrEmpty(wordList)) { return Regex.Replace(text, wordList); //How do I implement this part? } } Please could someone help me with this? Any help/comments will be appreciated! Thanks,

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  • Alternative Menu Items in NSMenu

    - by Nick Paulson
    Hi, I have an NSMenu that contains NSMenuItems with custom views. I want it so that when the alt button is pressed, the menu items would change part of their look (through their view). I found setAlternative in the NSMenuItem docs, however, in practice I could only get it to work with NSMenuItems without custom views. As soon as I set a custom view, all of the menu items would be displayed. Also, I tried getting keypress events while the menu was open. Due to the other run loop, NSApplication's sendEvent: doesn't receive events until after the menu is closed. Therefore, I can't just intercept the event coming in. Does anyone know how I can get notified, whether through delegation or subclassing, of when the alt key is pressed when a menu is opened?

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  • FLEX, Actionscript: 2 questions about mouseOver event and image scaling

    - by Patrick
    hi, 1) if I create items in a for loop, is correct to add a new eventListener for each item ? Or should I add only 1 eventListener to the parent ? and call the event through ID ? 2) if I want to scale my item, (a LinkButton with icon image), I noticed that the icon is sometimes resized with delay, so I have a bit of flickering when I trigger the event. Should I not use icons, and set the image in another way ? How can I fix this ? thanks

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  • In R, when using named rows, can a sparse matrix column be added to another sparse matrix?

    - by ayman
    I have two sparse matrices, m1 and m2: > m1 <- Matrix(data=0,nrow=2, ncol=1, sparse=TRUE, dimnames=list(c("b","d"),NULL)) > m2 <- Matrix(data=0,nrow=2, ncol=1, sparse=TRUE, dimnames=list(c("a","b"),NULL)) > m1["b",1]<- 4 > m2["a",1]<- 5 > m1 2 x 1 sparse Matrix of class "dgCMatrix" b 4 d . > m2 2 x 1 sparse Matrix of class "dgCMatrix" a 5 b . > and I want to cbind() them to make a sparse matrix like: [,1] [,2] a . 5 b 4 . d . . however cbind() ignores the named rows: > cbind(m1[,1],m2[,1]) [,1] [,2] b 4 5 d 0 0 is there some way to do this without a brute force loop?

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  • DataGridView Winform Auto Insert Ordinal Column (Trick)

    - by pang
    I want to get some trick for this problem. I have my table like this Product (uuid, Name) and one datagridview to display this information ( dataGridView.DataSouce = Products which is assign on runtime) My problem is that I want to have "No" column on dataGridView which will show like below No | Name 1 | ProdctA 2 | ProductB 3 | ProductC What I do right now is create a "No" field on my product Model, and loop through all the row and assign value to it. I think this is not a good solution. Hope anyone can suggest better solution. Thanks,

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  • How to style alternating rows in asp.net mvc

    - by YeahStu
    I am using a <% foreach ...% loop to list a collection of items on my website. I want to add a different background color for the style of alternating rows in my list. I have found a way to do this but I am not satisfied with it as it seems like a hack. Here is what I have done to solve it so far: <table> <% int counter = 0; foreach (var item in Model) { counter++; if (counter % 2 == 0) { %> <tr class="colorfull"> <% } else { %> <tr> <% } %> ... Is there a best practice that I am missing that people are using for this scenario in ASP.NET MVC?

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  • Use super with before_validation.

    - by krunal shah
    I have this code in my every model. Class people def before_validation @attributes.each do |key,value| self[key] = nil if value.blank? end end end Now i want to put my loop in separate module. Like Module test def before_validation @attributes.each do |key,value| self[key] = nil if value.blank? end end end And i want to call this before_validation this way Class people include test def before_validation super .....Here is my other logic part..... end end Are there any way to do it like that in rails??

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  • Generating a list of Strings in Obj C

    - by eco_bach
    Hi It seems that Objective C jumps thru hoops to make seemingly simple tasks extremely difficult. I simply need to create a sequence of strings, image1.jpg, image2.jpg, etc etc ie in a loop var imgString:String='image'+i+'.jpg; I assume a best practice is to use a NSMutableString with appendString method? What am I doing wrong?? NSMutableString *imgString; for(int i=1;i<=NUMIMAGES;i++){ imgString.appendString(@"image"+i+@".jpg"); } I get the following error error: request for member 'appendString' in something not a structure or union

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  • Why won't the VisualVM Profiler profile my application?

    - by Luke
    I've created a simple 1 file java application that iterates through a loop, calls some functions, allocates some memory, adds some numbers, etc. I run that application via eclipse's Run As->Java Application. The running application shows up in Java VisualVM under Local. I double click on that application and go to the Profiler tab. The default settings are: Start profiling from classes: my.main.package.** Do not profile classes: java.*, javax.*, sun.*, sunw.*, com.sun.* I click on CPU. The CPU and Memory buttons gray out. Nothing happens. The Status says profiling inactive. When my application terminates the Status says application terminated. What am I doing wrong here? Are there some settings I need to tweak? Do I need to set a VM flag when I launch my application?

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