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  • Question about Byte-Pairing for data compression [closed]

    - by user1669533
    Question about Byte-Pairing for data compression. If byte pairing converts two byte values to a single byte value, splitting the file in half, then taking a gig file and recusing it 16 times shrinks it to 62,500,000. My question is, is byte-pairing really efficient? Is the creation of a 5,000,000 iteration loop, to be conservative, efficient? I would like some feed back on and some incisive opinions please. Best Regards.

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  • Mark duplicates in MySql with php (without deleting)

    - by Adam
    So, I'm having some problems with a MySQL query (see other question), and decided to try a different approach. I have a database table with some duplicate rows, which I actually might need for future reference, so I don't want to remove. What I'm looking for is a way to display the data without those duplicates, but without removing them. I can't use a simple select query (as described in the other question). So what I need to do is write a code that does the following: 1. Go through my db Table. 2. Spot duplicates in the "ip" column. 3. Mark the first instance of each duplicate with "0" (in a column named "duplicate") and the rest with "1". This way I can later SELECT only the rows WHERE duplicate=0. NOTE: If your solution is related to the SELECT query, please read this other question first - there's a reason I'm not just using GROUP BY / DISTINCT. Thanks in advance.

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  • SQL SERVER – Where Can YOU Get My Books – SQL Server Interview Question and Answers

    - by pinaldave
    Earlier month I released by third book SQL Server Interview Question and Answers. The focus of this book is ‘master the basics’. If you rate yourself 10 out of 10 in SQL Server – this book is not for you but if you want to learn fundamentals or want to refresh your fundamentals this book is for YOU. Earlier I was overwhelmed by love you all have shown to this book on release date leading our three digit inventory to run out of stock. Read detail blog post about the subject over here A Real Story of Book Getting ‘Out of Stock’ to A 25% Discount Story Available. Well, we learn the lesson from the experience and have made sure that the inventory does not run out any more. Since then we are now available on multiple outlets. Pretty much anywhere in USA and India the book is available. Additionally, where ever Amazon ships internationally. I have created dedicated page where I have listed where one can avail this book from Details of SQL Server Interview Question and Answers. Even though I keep on getting common question like – where one can get this book. You can get this book from: USA: Amazon India: Flipkart | IndiaPlaza | Crossword In India now you can walk into any crossword store and ask this book, if they do not have it, you can ask them get one for you. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Best Practices, Pinal Dave, PostADay, SQL, SQL Authority, SQL Documentation, SQL Download, SQL Interview Questions and Answers, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Author Visit, SQLAuthority Book Review, SQLAuthority News, T SQL, Technology

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  • SQL SERVER – Relationship with Parallelism with Locks and Query Wait – Question for You

    - by Pinal Dave
    Today, I have one very simple question based on following image. A full disclaimer is that I have no idea why it is like that. I tried to reach out to few of my friends who know a lot about SQL Server but no one has any answer. Here is the question: If you go to server properties and click on Advanced you will see the following screen. Under the Parallelism section if you noticed there are four options: Cost Threshold for Parallelism Locks Max Degree of Parallelism Query Wait I can clearly understand why Cost Threshold for Parallelism and Max Degree of Parallelism belongs to Parallelism but I am not sure why we have two other options Locks and Query Wait belongs to Parallelism section. I can see that the options are ordered alphabetically but I do not understand the reason for locks and query wait to list under Parallelism. Here is the question for you – Why Locks and Query Wait options are listed under Parallelism section in SQL Server Advanced Properties? Please leave a comment with your explanation. I will publish valid answers on this blog with due credit. Reference: Pinal Dave (http://blog.sqlauthority.com)   Filed under: PostADay, SQL, SQL Authority, SQL Puzzle, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Is it just me or is this a baffling tech interview question

    - by Matthew Patrick Cashatt
    Background I was just asked in a tech interview to write an algorithm to traverse an "object" (notice the quotes) where A is equal to B and B is equal to C and A is equal to C. That's it. That is all the information I was given. I asked the interviewer what the goal was but apparently there wasn't one, just "traverse" the "object". I don't know about anyone else, but this seems like a silly question to me. I asked again, "am I searching for a value?". Nope. Just "traverse" it. Why would I ever want to endlessly loop through this "object"?? To melt my processor maybe?? The answer according to the interviewer was that I should have written a recursive function. OK, so why not simply ask me to write a recursive function? And who would write a recursive function that never ends? My question: Is this a valid question to the rest of you and, if so, can you provide a hint as to what I might be missing? Perhaps I am thinking too hard about solving real world problems. I have been successfully coding for a long time but this tech interview process makes me feel like I don't know anything. Final Answer: CLOWN TRAVERSAL!!! (See @Matt's answer below) Thanks! Matt

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  • Entry level engineer question regarding memory mangement

    - by Ealianis
    It has been a few months since I started my position as an entry level software developer. Now that I am past some learning curves (e.g. the language, jargon, syntax of VB and C#) I'm starting to focus on more esoteric topics, as to write better software. A simple question I presented to a fellow coworker was responded with "I'm focusing on the wrong things." While I respect this coworker I do disagree that this is a "wrong thing" to focus upon. Here was the code (in VB) and followed by the question. Note: The Function GenerateAlert() returns an integer. Dim alertID as Integer = GenerateAlert() _errorDictionary.Add(argErrorID, NewErrorInfo(Now(), alertID)) vs... _errorDictionary.Add(argErrorID, New ErrorInfo(Now(), GenerateAlert())) I originally wrote the ladder and rewrote it with the "Dim alertID" so that someone else might find it easier to read. But here was my concern and question. "Should one write this with the Dim AlertID, it would in fact take up more memory; finite but more, and should this method be called many times could it lead to an issue? How will .NET handle this object AlertID. Outside of .NET should one manually dispose of the object after use (near the end of the sub)." I want to ensure I become a knowledgeable programmer that does not just rely upon garbage collection. Am I over thinking this? Am I focusing on the wrong things?

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  • AI agents with FSM: a question regarding this

    - by Prog
    Finite State Machines implemented with the State design pattern are a common way to design AI agents. I am familiar with the State design pattern and know how to implement it. However I have a question regarding how this is used in games to design AI agents. Please consider a class Monster that represents an AI agent. Simplified it looks like this: class Monster{ State state; // other fields omitted public void update(){ // called every game-loop cycle state.execute(this); } public void setState(State state){ this.state = state; } // irrelevant stuff omitted } There are several State subclasses that implement execute() differently. So far classic State pattern. Here's my question: AI agents are subject to environmental effects and other objects communicating with them. For example an AI agent might tell another AI agent to attack (i.e. agent.attack()). Or a fireball might tell an AI agent to fall down. This means that the agent must have methods such as attack() and fallDown(), or commonly some message receiving mechanism to understand such messages. My question is divided to two parts: 1- Please say if this is correct: With an FSM, the current State of the agent should be the one taking care of such method calls - i.e. the agent delegates to the current state upon every event. Correct? Or wrong? 2- If correct, than how is this done? Are all states obligated by their superclass) to implement methods such as attack(), fallDown() etc., so the agent can always delegate to them on almost every event? Or is it done in some other way?

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  • Entry level engineer question regarding memory management

    - by Ealianis
    It has been a few months since I started my position as an entry level software developer. Now that I am past some learning curves (e.g. the language, jargon, syntax of VB and C#) I'm starting to focus on more esoteric topics, as to write better software. A simple question I presented to a fellow coworker was responded with "I'm focusing on the wrong things." While I respect this coworker I do disagree that this is a "wrong thing" to focus upon. Here was the code (in VB) and followed by the question. Note: The Function GenerateAlert() returns an integer. Dim alertID as Integer = GenerateAlert() _errorDictionary.Add(argErrorID, NewErrorInfo(Now(), alertID)) vs... _errorDictionary.Add(argErrorID, New ErrorInfo(Now(), GenerateAlert())) I originally wrote the latter and rewrote it with the "Dim alertID" so that someone else might find it easier to read. But here was my concern and question: Should one write this with the Dim AlertID, it would in fact take up more memory; finite but more, and should this method be called many times could it lead to an issue? How will .NET handle this object AlertID. Outside of .NET should one manually dispose of the object after use (near the end of the sub). I want to ensure I become a knowledgeable programmer that does not just rely upon garbage collection. Am I over thinking this? Am I focusing on the wrong things?

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  • XmlSerializer and Mark-up (Xml or Html)

    - by Kieron
    Hi, I've a requirement to serialize any class provided (decorated with the appropriate XmlElement/ XmlAttribute etc), but some of the properties may contain some sort of mark-up...usually HTML, but it could as easily be XML in the future. When trying to serialize the class the XmlSerializer crashes. I'd hope to be able to apply no more than an attribute to the property (currently set to XmlText) in the hope that it would wrap the content in CDATA[...], but that doesn't seem to work. I've seen several 'workarounds' like the one here, but I'd hoped for something a little less impactful for the developing consumer. Does anyone know of any 'nicer' less invasive solution...? Thanks, Kieron

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  • Open Source Queuing Solutions for peek, mark as done and then remove

    - by user330114
    I am looking at open source queuing platforms that allow me do the following: I have multiple producers, multiple consumers putting data into a queue in a multithreaded environment with the specific use case: I want the ability for consumers to be able do the following Peek at a message from the queue(which should mark as the message as invisible on the queue so that other consumers cannot consume the same message) The consumer works on the message consumed and if it is able to do the work successfully, it marks the message as consumed which should permanently delete it from the queue. If the consumer dies abruptly after marking the message as consumed or fails to acknowledge successful consumption after a certain timeout, the message is made visible on the queue again so that another consumer can pick it up. I've been looking at RabbitMQ, hornetQ, ActiveMQ but I'm not sure I can get this functionality out of the box, any recommendations on a system that gives me this functionality?

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  • Databinding to type double - decimal mark lost

    - by user1277327
    I have a project where I'm databinding a gridview to a list, where one column is databound to a gridview. The problem I have is that with the double being 5.5 on one computer it appears as 5.5 in the gridview. But on another it looks like 55, the decimal mark dissapears. So 3.14 will look like 314 etc. The error occurs with the following code: myDatagrid.ItemsSource = someList; Binding binding = new Binding("DoubleValue"); myColumnInDatagrid.Binding = binding; I've also tried using a very simple valueconverter, that just return the double, and parsed it in ConvertBack. I'm pretty new to WPF so I'm sorry if I've made some obvious mistakes, I just don't understand why it works on one computer but not on the other. Perhaps it should be noted that both of the computers use the same operating system, with the same language settings (afaik at least).

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  • How to mark empty in a single element in a float array

    - by Vineeth Mohan
    I have a large float (primitive) array and not every element in the array is filled. How can i mark a particular element as EMPTY. I understand this can be achieved by some special symbols but still i would like to know the standard way. Even if i am using some special symbol , how will i handle a situation where the actual data item is the value of special symbol. In short my question is how to implement the NULL feature in a primitive type array in java. PS - The reason why i am not using Float object is to achieve a high memory and speed performance. Thanks Vineeth

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  • datagrid column custom check mark

    - by Berryl
    I want a read only column bound to a boolean that shows a check mark image when true and nothing when false. The problem is the false value; I just want to show whatever the background of the datagrid is, but I don't see how to clear the image source. What should the Value of the image source be to do this? Cheers, Berryl <DataGridTemplateColumn.CellTemplate> <DataTemplate> <Image Name="imgChecked" Source="\Img_Checkmark" /> <DataTemplate.Triggers> <DataTrigger Binding="{Binding IsPrimary}" Value="False"> <Setter TargetName="imgChecked" Property="Source" Value=""/> *** ??? *** </DataTrigger> </DataTemplate.Triggers> </DataTemplate> </DataGridTemplateColumn.CellTemplate>

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  • PHP - Store & Calculate the total mark from radio input

    - by user1806136
    I have designed a small web-based system that have a school evaluation form to ask specific users who can access the system" some questions and the input will be a radio type ( 1 or 2 or 3 or 4)! the code is working and can inserts the input into the database but i don't know the correct query to calculate the total mark and store it in the database, this is currently working code below: <?php session_start(); $Load=$_SESSION['login_user']; include('../connect.php'); $sql= "Select name from student where ID='$Load'"; $username = mysql_query($sql); $id=$_SESSION['login_user']; if (isset($_POST['submit'])) { $v1 = $_POST['v1']; $v2 = $_POST['v2']; $v3 = $_POST['v3']; $total = $_POST['total']; mysql_query("INSERT into Form1 (P1,P2,P3,TOTAL) values('$v1','$v2','$v3','$total')") or die(mysql_error()); header("Location: mark.php"); } ?> <html> <head> <?php if(!isset($_SESSION['login_user'])) header("Location:index.html"); ?> <title>Q&A Form</title> </head> <body> <center><form method="post" action="" > <table style="width: 20%" > <tr> <th> Criteria </th> <th> </th> </tr> <tr> <th> Excellent </th> <td > 4 </td> </tr> <tr> <th > Good <font size="3" > </font></th> <td> 3 <font size="4" > </font></td> </tr> <tr> <th > Average <font size="3" > </font></th> <td > 2 <font size="4" > </font></td> </tr> <tr> <th > Poor <font size="3" > </font></th> <td > 1 <font size="4" > </td> </tr> <font size='4'> <table style="width: 70%"> <tr> <th > School Evaluation <font size="4" > </font></th> <tr> <th > Criteria <font size="4" > </font></th> <th> 4<font size="4" > </font></th> <th> 3<font size="4" > </font></th> <th> 2<font size="4" > </font></th> <th> 1<font size="4" > </font></th> </tr> <tr> <th> Your attendance<font size="4" > </font></th> <td> <input type="radio" name ="v1" value = "4" checked = "checked" /></td> <td> <input type="radio" name ="v1" value = "3" /></td> <td> <input type="radio" name ="v1" value = "2" /></td> <td> <input type="radio" name ="v1" value = "1" /></td> </tr> <tr> <th > Your grades <font size="4" > </font></th> <td> <input type="radio" name ="v2" value = "4" checked = "checked" /></td> <td> <input type="radio" name ="v2" value = "3" /></td> <td> <input type="radio" name ="v2" value = "2" /></td> <td> <input type="radio" name ="v2" value = "1" /></td> </tr> <tr> <th >Your self-control <font size="4" > </font></th> <td> <input type="radio" name ="v3" value = "4" checked = "checked" /></td> <td> <input type="radio" name ="v3" value = "3" /></td> <td> <input type="radio" name ="v3" value = "2" /></td> <td> <input type="radio" name ="v3" value = "1" /></td> </tr> </tr> </table> <br> <a href="evaE.php"> <td><input type="submit" name="submit" value="Submit"> <input type="reset" name="clear" value="clear" style="width: 70px"></td> <?php $total = $v1+ $v2 + $v3; ?> </form> </center> </div> </body> </html> i used this query but it doesn't work out .. any help please? <?php $total = $v1+ $v2 + $v3; ?>

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  • Soluto’s New Quick Question Button Makes Family Tech Support Simple

    - by Jason Fitzpatrick
    Soluto, a computer and boot management tool, now features a Quick Question button that allows the people you help out to easily click a button and send you both a short message and a screenshot of the problem. Any time your friend or family member presses F8, Soluto will take a screenshot of the screen, the Task Manager history, and a note from the user highlighting what issue they’re experiencing, and then email it all to you. After reviewing the email you can easily login to Soluto to remotely manage your friend’s computer and help with the problem. For more information about Soluto you can check out our previous reviews of the service here and here, or just hit up the link below to read more and take Soluto for a test drive. Soluto is a free service (for the first 5 computers), Windows only. Introducing Quick Question [The Soluto Blog] Java is Insecure and Awful, It’s Time to Disable It, and Here’s How What Are the Windows A: and B: Drives Used For? HTG Explains: What is DNS?

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  • Simple MediaWiki question

    - by Adobe
    I'm thinking about making a mediawiki website. At first I'd like to try it at localhost. I'm running Kubuntu 11.10, so I did: sudo aptitude install apache2 mysql-server php5 php5-mysql php5-cli And I also fetched the latest mediawiki to: /home/boris/Its/sites/mediawiki-1.17.0 Now I'm supposed to open http://localhost/home/boris/Its/sites/mediawiki-1.17.0/index.php But firefox says the page is not found. While http://localhost works. If I get it right - I have to open index.php to install mediawiki. So my question is - what do I do wrong? I'm really sorry for this is might be a very simple question. By the way do I have to make a db beforehand? Is it possible to use mongoDB as a db with mediawiki?

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  • question about 12.10 32 bit syslinux 4.06 EDD 2012-10-23 usb direct boot

    - by logan
    alright so guys i am trying to do a direct boot for Ubuntu 12.10 (as stated in the topic) i have been trying to do a direct boot for about ten minutes now. so i have to do a direct boot because my original OS has a corrupted kernel (i am trying to fix a friends laptop) Toshiba satellite C655D-S5518 anyway getting back to the main point when i put the usb in everything starts up fine it loads the usb then it goes to this screen saying "SYSLINUX 4.06 EDD 2012-10-23 Copyright (C) 1994-2012 H. Peter Anvin et al." also getting a blinking line (as if i could put something in however when i try to type it does not show up so im guessing its telling me it is loading) However i am not getting a corrupted file or any kind of file error so im guessing my main question is, is this normal? and if so how long does it take for this to be done and what are the steps proceeding this? sorry guys if this is a dumb question i am new to the Ubuntu party haha thanks Logan.

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  • Qt question: hard-coded shortcuts

    - by miLo
    I have asked this question on several places but I still can't figure it out. What I am trying to do is to have a QKeySequence(Qt::CTRL + Qt::Key_X, Qt::CTRL + Qt::Key_C) in a MainWindow with QTextEdit as a central widget. The problem is that I have a shorcut for Cut(Ctrl+X) and when I press Ctrl+X,Ctrl+C it doesn't work. When the focus is on diffrent widget the shorcut works perfectly. I tried with overriding the QWidget::keyPressEvent and QWidget::event but it is the same. I have one more question: if I have these two shorcuts Ctrl+X and Ctrl+XCtrl+C why I don't receive the signal activatedAmbigiously() when I press Ctrl+X? According to the Qt documentation When a key sequence is being typed at the keyboard, it is said to be ambiguous as long as it matches the start of more than one shortcut.

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  • Question for class

    - by Tyler
    I have a question for class that I cannot figure out, I was hoping the helpful folks at Ask Ubuntu could help. The question is basically this: Your Linux system appears to have a DHCP problem. You decide to release and renew the DHCP lease by running the following command "SUDO IFCONFIG ETH0 DOWN". The command gives an error message saying Linux doesn't recognize the command. What's the problem? Any ideas? Thanks in advance.

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  • Client side prediction/simulation Question

    - by Legendre
    I found a related question but it doesn't have what I needed. Client A sends input to move at T0. Server receives input at T1. All clients receive the change at T2. Question: With client-side prediction, client A would start moving at T0, client-side. All other clients receive the change at T2, so to them, client A only started moving at T2. If I understand correctly, client B will always see client A's past position and not his current position? How do I sync both client B and client A?

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  • Interview question ranking FizzBuzz (1), implementing malloc (10)

    - by blrs
    I'd like to have your opinion on the difficulty of the following interview question: Find the subarray with maximum sum in an array of integers in O(n) time. This trivial sounding problem was made famous by Jon Bentley in his Programming Pearls where he uses it to demonstrate algorithm design techniques. On a scale of 1-10, 1 being the FizzBuzz (or HoppityHop) test and 10 being implement the C stdlib function malloc(), how would you rank the above problem? I think the people who can best answer this question are those who have read Programming Pearls and have tried to solve this problem on their own. To motivate those who haven't, 'Programming Pearls' gets featured many times in the 'Top 10 programming books' list.

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  • Missed question in technical phone interview and the follow up letter

    - by Jacob
    I may have just bombed a C++ technical phone interview. The interviewer asked mostly about data structures and I was able to go into detail about each of the data structures he asked about. Score one for me I'm thinking. Wrong. Then he asks to join me on a collaboration website where he can see what I am typing. This was the same process as interview #1 which went well, not perfect, but well. So the question was: How do you reverse a linked list? he gave a function prototype similar to Node *reverse(Node *head) I struggled with this for about 10-15 minutes until the hour was up. I was able to get the general idea across but was not able to reverse the link list. My question is that after remembering the answer post interview do I mention this in the thank you letter, if I even should write one?

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  • Mark text in HTML

    - by Alon
    Hi I have some plain text and html. I need to create a PHP method that will return the same html, but with <span class="marked"> before any instances of the text and </span> after it. Note, that it should support tags in the html (for example if the text is blabla so it should mark when it's bla<b>bla</b> or <a href="http://abc.com">bla</a>bla. It should be incase sensitive and support long text (with multilines etc) either. For example, if I call this function with the text "my name is josh" and the following html: <html> <head> <title>My Name Is Josh!!!</title> </head> <body> <h1>my name is <b>josh</b></h1> <div> <a href="http://www.names.com">my name</a> is josh </div> <u>my</u> <i>name</i> <b>is</b> <span style="font-family: Tahoma;">Josh</span>. </body> </html> ... it should return: <html> <head> <title><span class="marked">My Name Is Josh</span>!!!</title> </head> <body> <h1><span class="marked">my name is <b>josh</b></span></h1> <div> <span class="marked"><a href="http://www.names.com">my name</a> is josh</span> </div> <span class="marked"><u>my</u> <i>name</i> <b>is</b> <span style="font-family: Tahoma;">Josh</span></span>. </body> </html> Thanks.

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  • Closing Question Rights in Stack over flow

    - by Asim Sajjad
    I have posted my Question and some one has closed that question, but i didn't get my answer from any of the viewer who have view my question or post theire answer, how can anyone close question when I don't get answer or statisfied with the answer posted against my question??? Why people close the question without permission of the question owner ???

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