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  • Confused about Huffman Trees

    - by ShrimpCrackers
    A quick tutorial on generating a huffman tree Confused about Huffman Trees. Near the end of that link above, it shows the tree with 2 elements left, and then the completed tree. I'm confused about the way that it is branched. Is there a specific way a huffman tree needs to be branched? For example, 57:* with its right child 35:* is branched off to the right. Could it have been 35 branched to the left with 22 branched to the right? Also, why wasn't 22:* paired up with 15:4 - it just paired with 20:5 to create a new tree. From initial obersvations it seems the tree does not need to be balanced or have any specific order other than that the frequencies of a leaf add up to the value of the parent node. Could two people creating a huffman tree with the same data end up with different encoding values?

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  • Using code in both Actionscript3 and Javascript

    - by Ian
    Here's an interesting architectural query. I have a piece of code that needs to run on the server (under Node.js) and on the client (in a Flash 10 app written with Actionscript 3). The code is mostly fairly intricate object manipulation, it doesn't make any API calls, and works fine in both contexts. So far the project is just a demo, so I've been happy to copy and paste the code into both places. But it might be quite interesting to move forward with this. So how would you do it? I assume there is no easy way to get the Flash SDK (has to build without an IDE) to read and do something useful with a .js file. My only thought is that I could write a code-generator that takes the .js file and places it in an ActionScript wrapper. Are there any obvious approaches that I've missed? Just to pre-empt an obvious answer, I know about cross-platform languages like HaXe.

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  • [java] Efficiency of while(true) ServerSocket Listen

    - by Submerged
    I am wondering if a typical while(true) ServerSocket listen loop takes an entire core to wait and accept a client connection (Even when implementing runnable and using Thread .start()) I am implementing a type of distributed computing cluster and each computer needs every core it has for computation. A Master node needs to communicate with these computers (invoking static methods that modify the algorithm's functioning). The reason I need to use sockets is due to the cross platform / cross language capabilities. In some cases, PHP will be invoking these java static methods. I used a java profiler (YourKit) and I can see my running ServerSocket listen thread and it never sleeps and it's always running. Is there a better approach to do what I want? Or, will the performance hit be negligible? Please, feel free to offer any suggestion if you can think of a better way (I've tried RMI, but it isn't supported cross-language. Thanks everyone

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  • django admin how to limit selectbox values

    - by SledgehammerPL
    model: class Store(models.Model): name = models.CharField(max_length = 20) class Admin: pass def __unicode__(self): return self.name class Stock(Store): products = models.ManyToManyField(Product) class Admin: pass def __unicode__(self): return self.name class Product(models.Model): name = models.CharField(max_length = 128, unique = True) parent = models.ForeignKey('self', null = True, blank = True, related_name='children') (...) def __unicode__(self): return self.name mptt.register(Product, order_insertion_by = ['name']) admin.py: from bar.drinkstore.models import Store, Stock from django.contrib import admin admin.site.register(Store) admin.site.register(Stock) Now when I look at admin site I can select any product from the list. But I'd like to have a limited choice - only leaves. In mptt class there's function: is_leaf_node() -- returns True if the model instance is a leaf node (it has no children), False otherwise. But I have no idea how to connect it I'm trying to make a subclass: in admin.py: from bar.drinkstore.models import Store, Stock from django.contrib import admin admin.site.register(Store) class StockAdmin(admin.ModelAdmin): def queryset(self, request): qs = super(StockAdmin, self).queryset(request).filter(ihavenoideawhatfilter) admin.site.register(Stock, StockAdmin) but I'm not sure if it's right way, and what filter set.

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  • Multipart question: Mapping between xml and Json using xpath

    - by scope-creep
    This is a JSON mapping question from a json newbie. Currently i'm reading xml using xpath in C#, and the xpath are returning either the element or attribute node values, as is the schema's want. I want to write out some of the returned values into a json formatted file. I know i can faneigle the xpath expression to return the element or attribute names, so I can built the appropriate name/value json structure before serialization, but I was I'm wondering if their was some way of doing a mapping between the xml and json. The xml schema is fairly big, so potentially the mapping will be big, meaning a ton of cumbersom coding to make it work. Is their any way to automap somehow? I was planning to use json.net, which seems flexible enough, although their may be a better approach. Any help would be appreciated. Bob.

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  • DOS batch command to read some info from text file

    - by Ray
    Hello All, I am trying to read some info from a text file by using windows command line, and save it to a variable just like "set info =1234" Below is the content of the txt file, actually I just need the revision number, and the location of it is always the same line 5, and from column 11 to 15. In the sample it's 1234, and I am wondering is there a way to save it to a variable in Dos command line. Thanks a lot! svninfo.txt: Path: . URL: https://www.abc.com Repository Root: https://www.abc.com/svn Repository UUID: 12345678-8b61-fa43-97dc-123456789 Revision: 1234 Node Kind: directory Schedule: normal Last Changed Author: abc Last Changed Rev: 1234 Last Changed Date: 2010-04-01 18:19:54 -0700 (Thu, 01 Apr 2010)

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  • Distributed datastore

    - by Julien Genestoux
    We're trying to add some kind of persistence in our app. The app generates about 250 entries per second. Each of these entries belong to one of 2M files. For each file, we want to keep the last 10 entries, so we can look them up later. The way our client application works : it gets a stream of all the data it fetches the right file (GET) it adds the new content it saves the file back (PUT) We're looking for an efficient way to store this data that can scale horizontally as the amount of data we're getting is doubling every few weeks. We initially looked at S3. It works fine, but becomes very expensive very fast ($1000 monthly just in PUT operations!) We then gave a shot at Riak. But it seems we can't get more than 60 write/sec on each node, which is very very slow. Any other solution out there?

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  • Efficient data structure for fast random access, search, insertion and deletion

    - by Leonel
    I'm looking for a data structure (or structures) that would allow me keep me an ordered list of integers, no duplicates, with indexes and values in the same range. I need four main operations to be efficient, in rough order of importance: taking the value from a given index finding the index of a given value inserting a value at a given index deleting a value at a given index Using an array I have 1 at O(1), but 2 is O(N) and insertion and deletions are expensive (O(N) as well, I believe). A Linked List has O(1) insertion and deletion (once you have the node), but 1 and 2 are O(N) thus negating the gains. I tried keeping two arrays a[index]=value and b[value]=index, which turn 1 and 2 into O(1) but turn 3 and 4 into even more costly operations. Is there a data structure better suited for this?

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  • Delphi, VirtualStringTree - classes (objects) instead of records

    - by michal
    I need to use a class instead of record for VirtualStringTree node. Should I declare it standard (but in this case - tricky) way like that: PNode = ^TNode; TNode = record obj: TMyObject; end; //.. var fNd: PNode; begin fNd:= vstTree.getNodeData(vstTree.AddChild(nil)); fNd.obj:= TMyObject.Create; //.. or should I use directly TMyObject? If so - how?! How about assigning (constructing) the object and freeing it? Thanks in advance m.

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  • Problem with truncation of floating point values in DBSlayer.

    - by chrisdew
    When I run a query through DBslayer http://code.nytimes.com/projects/dbslayer the floating point results are truncated to a total of six digits (plus decimal point and negative sign when needed). { ... "lat":52.2228,"lng":-2.19906, ... } When I run the same query in MySQL, the results are as expected. | 52.22280884 | -2.19906425 | Firstly, am I correct in identifying DBSlayer as the cause of this effect? (Or the JSON library it uses, etc.) Secondly, is this floating point precision configurable within DBSlayer? Thanks, Chris. P.S. Ubuntu 9.10, x86_64 Path: . URL: http://dbslayer.googlecode.com/svn/trunk Repository Root: http://dbslayer.googlecode.com/svn Repository UUID: 5df2be84-4748-0410-afd4-f777a056bd0c Revision: 65 Node Kind: directory Schedule: normal Last Changed Author: dgottfrid Last Changed Rev: 65 Last Changed Date: 2008-03-28 22:52:46 +0000 (Fri, 28 Mar 2008)

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  • Change Image with transition effects

    - by Goro
    Hello, I have the following script that changes my image on a timer: var da = setInterval( function() { var current_image = document.getElementById('node_picture').src; var image_index = current_image.substring(48,49); image_index++; if (image_index > 4) { image_index = 1; } document.getElementById('node_picture').src="img/node/<?php echo $node_id ?>/" + image_index + ".png"; }, 4000); I am trying to add a jQuery FadeIn() effect. I tried to add $('node_picture').FadeIn(); but that does not work. Thanks,

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  • How to Serialize Binary Tree

    - by Veljko Skarich
    I went to an interview today where I was asked to serialize a binary tree. I implemented an array-based approach where the children of node i (numbering in level-order traversal) were at the 2*i index for the left child and 2*i + 1 for the right child. The interviewer seemed more or less pleased, but I'm wondering what serialize means exactly? Does it specifically pertain to flattening the tree for writing to disk, or would serializing a tree also include just turning the tree into a linked list, say. Also, how would we go about flattening the tree into a (doubly) linked list, and then reconstructing it? Can you recreate the exact structure of the tree from the linked list? Thank you/

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  • Java swing examples - Ants running around a world getting food from piles?

    - by Charlie
    I haven't done any swing programming in a while, so I'm looking for some GUI examples that are at least close to what I'm trying to do. The gui that I'll need to be representing is small nodes (let's say ants) travelling around collecting food from food piles (which just means small nodes travelling to bigger nodes). Once the node (ant) takes a piece of food, the pile shrinks a bit and the ant takes it back home (to ANOTHER circle). This SOUNDS pretty trivial, but all of the boilerplate involved in setting up a java GUI just makes little logical sense to me, and the GUI is such a small piece of my project. Any examples that would be great for this style of project would be greatly appreciated. Thanks!

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  • Castor: how to map a simple list of strings?

    - by Dmitriy
    I have the following field in my class: private List<String> messages; Here's the mapping I have: <field name="messages" collection="arraylist" type="string" container="false> <bind-xml name="errors" node="element"/> </field> This is what I get as a result of marshalling: <errors><string>message1</string><string>message2</string></errors> And this is what I want to achieve: <errors><error>message1</error><error>message2</error></errors> Any help is appreciated!

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  • parentNode.parentNode.rowindex to delete a row in a dynamic table

    - by billy85
    I am creating my rows dynamically when the user clicks on "Ajouter". <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <script> function getXhr(){ var xhr = null; if(window.XMLHttpRequest) // Firefox and others xhr = new XMLHttpRequest(); else if(window.ActiveXObject){ // Internet Explorer try { xhr = new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } } else { // XMLHttpRequest not supported by your browser alert("Votre navigateur ne supporte pas les objets XMLHTTPRequest..."); xhr = false; } return xhr } /** * method called when the user clicks on the button */ function go(){ var xhr = getXhr() // We defined what we gonna do with the response xhr.onreadystatechange = function(){ // We do somthing once the server's response is OK if(xhr.readyState == 4 && xhr.status == 200){ //alert(xhr.responseText); var body = document.getElementsByTagName("body")[0]; // Retrieve <table> ID and create a <tbody> element var tbl = document.getElementById("table"); var tblBody = document.createElement("tbody"); var row = document.createElement("tr"); // Create <td> elements and a text node, make the text // node the contents of the <td>, and put the <td> at // the end of the table row var cell_1 = document.createElement("td"); var cell_2 = document.createElement("td"); var cell_3 = document.createElement("td"); var cell_4 = document.createElement("td"); // Create the first cell which is a text zone var cell1=document.createElement("input"); cell1.type="text"; cell1.name="fname"; cell1.size="20"; cell1.maxlength="50"; cell_1.appendChild(cell1); // Create the second cell which is a text area var cell2=document.createElement("textarea"); cell2.name="fdescription"; cell2.rows="2"; cell2.cols="30"; cell_2.appendChild(cell2); var cell3 = document.createElement("div"); cell3.innerHTML=xhr.responseText; cell_3.appendChild(cell3); // Create the fourth cell which is a href var cell4 = document.createElement("a"); cell4.appendChild(document.createTextNode("[Delete]")); cell4.setAttribute("href","javascrit:deleteRow();"); cell_4.appendChild(cell4); // add cells to the row row.appendChild(cell_1); row.appendChild(cell_2); row.appendChild(cell_3); row.appendChild(cell_4); // add the row to the end of the table body tblBody.appendChild(row); // put the <tbody> in the <table> tbl.appendChild(tblBody); // appends <table> into <body> body.appendChild(tbl); // sets the border attribute of tbl to 2; tbl.setAttribute("border", "1"); } } xhr.open("GET","fstatus.php",true); xhr.send(null); } </head> <body > <h1> Create an Item </h1> <form method="post"> <table align="center" border = "2" cellspacing ="0" cellpadding="3" id="table"> <tr><td><b>Functionality Name:</b></td> <td><b>Description:</b></td> <td><b>Status:</b></td> <td><input type="button" Name= "Ajouter" Value="Ajouter" onclick="go()"></td></tr> </table> </form> </body> </html> Now, I would like to use the href [Delete] to delete one particular row. I wrote this: <script type="text/javascript"> function deleteRow(r){ var i=r.parentNode.parentNode.rowIndex; document.getElementById('table').deleteRow(i); } </script> When I change the first code like this: cell4.setAttribute("href","javascrit:deleteRow(this);"); I got an error: The page cannot be displayed. I am redirected to a new pagewhich can not be displayed. How could I delete my row by using the function deleteRow(r)? table is the id of my table Thanks. Billy85

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  • Unique identifiers for users

    - by Christopher McCann
    If I have a table of a hundred users normally I would just set up an auto-increment userID column as the primary key. But if suddenly we have a million users or 5 million users then that becomes really difficult because I would want to start becoming more distributed in which case an auto-increment primary key would be useless as each node would be creating the same primary keys. Is the solution to this to use natural primary keys? I am having a real hard time thinking of a natural primary key for this bunch of users. The problem is they are all young people so they do not have national insurance numbers or any other unique identifier I can think of. I could create a multi-column primary key but there is still a chance, however miniscule of duplicates occurring. Does anyone know of a solution? Thanks

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  • How read value from XmlNode

    - by klerik123456
    I have a Xml file and I try to read value from node Ticket, but my output is still empty. Can somebody help me ? Xml docmunet : <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <soap:Header> <TicketHeader xmlns="http://tempuri.org/"> <Ticket> heslo </Ticket> </TicketHeader> </soap:Header> <soap:Body> <test xmlns="http://tempuri.org/"/> </soap:Body> </soap:Envelope> My code : doc= new XmlDocument(); doc.Load(path); XmlNode temp = doc.SelectSingleNode("//Ticket"); textBox3.Text=temp.InnerXml;

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  • Unable to add a row to a HTML table dynamically

    - by madhu
    I am unable to add a row to a HTML table dynamically. I am using IHtmlDocument2 to create tr and td elements and IHtmlElement to set attributes and IHtmlDomNode to add created node to the document hierarchy. Please anyone help me to solve the above problem. I am traversing through the document when I get the tr tag I have created the tr element using CreateElement, then I use InsertBefore to insert it into the document but it's not working. I've tried for one week but didn't get anything working.

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  • Integers in TextNodes w/ Python minidom

    - by PylonsN00b
    I am working on an API using SOAP and WSDL. The WSDL expects integers to come through. I am fairly new to ALL of this, and constructing XML in Python. I have chosen to use minidom to create my SOAP message. So using minidom, to get a value into a node I found I have to do this: weight_node = xml_file.createElement("web:Weight") weight_contents = xml_file.createTextNode(weight) weight_node.appendChild(weight_contents) So say weight needs to go in as an integer and IS an integer. The function is 'createTextNode' does this mean its going to be text, or what I put in there has to be text? Again I am fairly new to all of this. So if what I have explained seems way off base, please speak up.

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  • 'whatever' has no declared type

    - by mihirpmehta
    i am developing parser using bison...in my grammar i am getting this error Here is a code extern NodePtr CreateNode(NodeType, ...); extern NodePtr ReplaceNode(NodeType, NodePtr); extern NodePtr MergeSubTrees(NodeType, ...); ................... NodePtr rootNodePtr = NULL; /* pointer to the root of the parse tree */ NodePtr nodePtr = NULL; /* pointer to an error node */ ........................... NodePtr mainMethodDecNodePtr = NULL; ................ /* YYSTYPE */ %union { NodePtr nodePtr; } i am getting this error whenever i use like $$.nodePtr or $1.nodePtr ... I am getting Parser.y:1302.32-33: $1 of `Expressi on' has no declared type

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  • Drupal setup for proofreaders - "Revision Moderation"

    - by Olav
    I would like to have external proofreaders to work directly inside my Drupal site. Basically they should be able to create new revisions, annotate, comment etc without affecting what users see without my approval. Particularly the node might already be public. "Revision Moderation" module sounds a bit like what I want, but it seems not to be so much used, and I run into other modules like "Workflow". What is important for me: Possibility to work on content already published Easy for the proofreader, easy for me to direct her to the right location Other useful features such as comments (Like those balloons in Word), diffs etc (I guess I could work around (1) by copying the content)

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  • How to trace a raw (character) device stream on Unix ?

    - by Fabien
    I'm trying to trace what is transiting in a raw (character) device on an Unix system (ex: /dev/tty.baseband) for DEBUG purpose. I am thinking of creating a deamon that would: upon start rename /dev/tty.baseband to /dev/tty.baseband.old. create a raw node /dev/tty.baseband spawn two threads: Thread 1: reading /dev/tty.baseband.old writing into /dev/tty.baseband Thread 2: reading /dev/tty.baseband writing into /dev/tty.baseband.old This would work a little bit like a MITM process. I wonder if there is not a 'standard' way to do this.

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  • Graph visualization code in javascript?

    - by Chris Farmer
    Hi. I have a data structure that represents a directed graph, and I want to render that dynamically on an HTML page. Does anyone know of any javascript code that can do a reasonable job with graph layout? These graphs will usually be just a few nodes, maybe ten at the very upper end, so my guess is that performance isn't going to be a big deal. Ideally, I'd like to be able to hook it in with jQuery so that users can tweak the layout manually by dragging the nodes around. Edit: Google's Visualization API seems to be more "graphs as charts" oriented than "graphs as nodes" oriented. I didn't see any node-oriented visualizations already built there, anyway. Do you know that one exists?

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  • Gluster strange issue with shared mount point like seprate mount.

    - by Satish
    I have two nodes and for experiment i have install glusterfs and create volume and successfully mounted on own node, but if i create file in node1 it is not showing in node2, look like both behaving like they are separate. node1 10.101.140.10:/nova-gluster-vol 2.0G 820M 1.2G 41% /mnt node2 10.101.140.10:/nova-gluster-vol 2.0G 33M 2.0G 2% /mnt volume info split brian $ sudo gluster volume heal nova-gluster-vol info split-brain Gathering Heal info on volume nova-gluster-vol has been successful Brick 10.101.140.10:/brick1/sdb Number of entries: 0 Brick 10.101.140.20:/brick1/sdb Number of entries: 0 test node1 $ echo "TEST" > /mnt/node1 $ ls -l /mnt/node1 -rw-r--r-- 1 root root 5 Oct 27 17:47 /mnt/node1 node2 (file isn't there, while they are shared mount) $ ls -l /mnt/node1 ls: cannot access /mnt/node1: No such file or directory What i am missing??

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  • create a list of threads in C

    - by Hristo
    My implementation (in C) isn't working... the first node is always NULL so I can't free the memory. I'm doing: thread_node_t *thread_list_head = NULL; // done in the beginning of the program ... // later on in the program thread_node_t *thread = (thread_node_t*) malloc(sizeof(thread_node_t)); pthread_create(&(thread->thread), NULL, client_thread, &csFD); thread->next = thread_list_head; thread_list_head = thread; So when I try to free this memory, thread_list_head is NULL. while (thread_list_head != NULL) { thread_node_t *temp = thread_list_head; thread_list_head = thread_list_head->next; free(temp); temp = NULL; } Any advice on how to fix this or just a new way to create this list that would work better? Thanks, Hristo

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