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• Storing n-grams in database in < n number of tables.

  - by kurige

  If I was writing a piece of software that attempted to predict what word a user was going to type next using the two previous words the user had typed, I would create two tables. Like so: == 1-gram table == Token | NextWord | Frequency ------+----------+----------- "I" | "like" | 15 "I" | "hate" | 20 == 2-gram table == Token | NextWord | Frequency ---------+------------+----------- "I like" | "apples" | 8 "I like" | "tomatoes" | 12 "I hate" | "tomatoes" | 20 "I hate" | "apples" | 2 Following this example implimentation the user types "I" and the software, using the above database, predicts that the next word the user is going to type is "hate". If the user does type "hate" then the software will then predict that the next word the user is going to type is "tomatoes". However, this implimentation would require a table for each additional n-gram that I choose to take into account. If I decided that I wanted to take the 5 or 6 preceding words into account when predicting the next word, then I would need 5-6 tables, and an exponentially increase in space per n-gram. What would be the best way to represent this in only one or two tables, that has no upper-limit on the number of n-grams I can support?

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• MySQLi Prepared Statement Query Issue

  - by Benjamin Flak

  I'm relatively new to MySQLi prepared statements, and running into an error. Take this code: $user = 'admin'; $pass = 'admin'; if ($stmt = $mysqli->query("SELECT * FROM members WHERE username='$user' AND password='$pass'")) { echo $stmt->num_rows; } This will display "1", as it should. This next piece of code though, returns "0": $user = 'admin'; $pass = 'admin'; if ($stmt = $mysqli->prepare("SELECT * FROM members WHERE username=? AND password=?")) { $stmt->bind_param("ss", $user, $pass); $stmt->execute(); echo $stmt->num_rows; } Any ideas why?

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• Distributed version control systems merge easiness details

  - by Idsa

  I have just read Joel's blogpost concerning distributed version control systems and can't understand the main idea. He says that SVN thinks in terms of versions while Mercurial thinks in terms of changes. And, according to Joel, it solves merging problems. I heard this idea several times and still haven't conceived it. As I know, SVN's merging mechanism is based on changes (diffs) too. So what is the difference? I have no experience with distributed version control systems but I actively use SVN branching/merging and had no serious problems with it. Of course there are merging conflicts sometimes (when one piece of code was changed in both branches). But I see no way how this problem can be solved automatically by some kind of control version system.

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• Git Specify Remote Source Durring Push

  - by ThinkBohemian

  I have a local git repository a "central" repo at github. I'm working on a part of a project, while a friend is working on a related piece that is its entirely seperate repo, is it possible for me to simply link directly to my friends repo? For example, the app is called widgets. I have all my code in widgets/app/mycode and my friend is writing code that goes into widgets/plugins/awesome/hiscode. I want to be able to always have http://github.com/mycode/widgets/plugins/hiscode to be a direct link or clone to http://github.com/hiscode/awesome ? It could be possible i'm missing something basic in my question or knowledge of git, if so please ask, and i'll be happy to try to fill in the blanks.

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• XNA Music mixing real-time

  - by Adam L. S.

  I've created a "format" to store segments of music (prelude part, repeated part, ending part) and time information for these segments (offset, scored length) so I can mix it up in real-time as if it were one piece of music, while repeating the repeated part (optionally) indefinitely. This way, the segments can store decay where the next segment is played, while the previous one is finished. (I've created a player for this in Java, and used the Clip class.) I wanted this format, so I can provide a finite length music (for a jukebox feature), while I play infinite length music in-games. However, when I wanted to code a class in XNA that manages this "format" I've noticed, that there is no obvious way to play "Songs" simultaneously/overlapped. How can I do this/what is the best practice, not leaving the XNA framework? (I don't want to create infinite play-lists.)

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• shall I move from prototype to jquery?

  - by opensas

  lastly I've been feeling like jquery is slowly becoming the defacto standard in js libraries I might be wrong!) or at least that is more active than the rest of the frameworks... for example I've been looking for a fine open source calendar like componente and found http://fullcalendar.vinsol.com/ we've been using prototype for very little things, like its selector capabilities ($ function as a shortcut for document.getElementById, mainly), executing some piece of js when the page is loaded and to issue some very simple ajax calls. so I guess the migration should be quite straight forward, but I'd like to know the pros / cons of migrating to prototype... on the other hand, I guess that having both of them together is not a good choice, specially taking into account that the migration should be quite simple... am I right? saludos sas

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• How to avoid piracy in iPhone apps by server side validation?

  - by prathumca

  As par my app requirement, there is a couple of scenarios that I need to handle. Scenario 1: To avoid piracy, I want to include some piece of code, whose job is sending both IMEI and Serial number of IPhone. Scenario 2: At server side, I've a database, which has a list of both IMEI and Serial No info. Here I wanna validate both IMEI and Serial numbers. If both are not matched then I can make sure that the app is pirated. Idea seems good. But I don't know how to handle these two scenarios in my app. Any help is greatly appreciated.

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• Does the Frontier Kernel have a future?

  - by pbreitenbach

  Whatever you think about Dave Winer, Frontier is an incredible piece of software. It includes quite a few advances that have yet to be surpassed: the object database, the database viewer, the scripting environment, the hierarchical-including website generation scheme, the elegant scripting language, the mixing of scripts and compilation, rapid prototyping, built in web server, simple debugger, cross-platform, simple UI, etc. My question: Dave turned Frontier over to open source and there is a Frontier Kernel project. However it is fairly quiet. Does Frontier have a future from here?

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• What is a read only collection in C#?

  - by acidzombie24

  I ran a security code analyst i found myself having a CA2105 warning. I looked at the grade tampering example. I didnt realize you can assign int[] to a readonly int. I thought readonly was like the C++ const and makes it illegal. The How to Fix Violations suggest i clone the object (which i dont want to do) or 'Replace the array with a strongly typed collection that cannot be changed'. I clicked the link and see 'ArrayList' and adding each element one by one and it doesnt look like you can prevent something adding more. So when i have this piece of code what is the easiest or best way to make it a read only collection? public static readonly string[] example = { "a", "b", "sfsdg", "sdgfhf", "erfdgf", "last one"};

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• Parsing log files in a folder in ColdFusion

  - by Simon Guo

  The problem is there is a folder ./log/ containing the files like: jan2010.xml, feb2010.xml, mar2010.xml, jan2009.xml, feb2009.xml, mar2009.xml ... each xml file would like: <root><record name="bob" spend="20"></record>...(more records)</root> I want to write a piece of ColdFusion code (log.cfm) that simply parsing those xml files. For the front end I would let user to choose a year, then the click submit button. All the content in that year will be show up in separate table by month. Each table shows the total money spent for each person. like: person cost bob 200 mike 300 Total 500 Thanks.

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• Watin testing of FckEditor

  - by Iyyengar

  I have been working on the integration testing of a webapp using watin. The webapp uses fckeditor as one of the richtext controls. Here is the piece of html of the viewsource of my webapp that includes fckeditor iframe id="ctl00_HeaderMain_txtSafetyNetDescription___Frame" src="/FCKEditor/editor/fckeditor.html?InstanceName=ctl00_HeaderMain_txtSafetyNetDescription&Toolbar=myApp" width="100%" height="200px" frameborder="no" scrolling="no" /iframe By using the watin script ... i am able to get the frame object with the following code. Frame frame = ie.Frame(Find.ById("ctl00_HeaderMain_txtSafetyNetDescription___Frame")) ; Now I want to write some text to the fckeditor. But i am not sure how to write to the fckeditor as it is a frame -- can someone help me on this. Thanks. Iyyengar.

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• WPF - Binding a variable in an already bound ListBox?

  - by Corey Ogburn

  I really don't know how to title this question, but I need some help with binding to a ListBox. I have an object, that contains (among other information) 2 properties that need to be bound in one ListBox. One of these is an ObservableCollection of objects, called Layers, and the other property holds an enum value of either Point, Line or Polygon, called SpatialType. These are to act as a legend to a map application. I have bound Layers to a ListBox, no problem, but inside the ListBox.ItemTemplate, I need to bind the single variable SpatialType to every Item in the ListBox. The problem I'm running into is that when I try to bind while inside the ListBox, the only variables I have access to are the properties of each Layer and I can't access any properties of the original bound class that holds the Layers (and the needed SpatialType property). What can I do to get that piece of information bound inside the ItemTemplate without messing up a good MVVM architecture?

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• reading 2 lines from IniFile

  - by Lakkerw

  Trying again. On advice, adding the piece of code that I do understand. I am fine with the fact that I have to save 4 bits of information in two lines like so: IniFile.WriteString('TestSection','Name','Country'); IniFile.WriteString('TestSection','City','Street'); My question is more about loading this information back into the form. If in my IniFile I have saved for example the following code [TestSection] John=Uk London=barlystreet Mike=Spain Madrid=eduardostrata Emma=USA New York=1st Avenue Made up information in the IniFile. Added through the code above. Now my question is: How could I load for example, when I type in an edit box Mike, the rest of the belonging information.(Spain, Madrid,eduardostrata).

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• Unexpected { expected ( ?

  - by Luke

  Parse error: syntax error, unexpected '{', expecting '(' in /home/a7237281/public_html/include/session.php on line 313 this is the error i get, relating to this code //check the emails $field = "email"; //Use field name for email $field2 = "email2"; if(!$subemail || strlen($subemail = trim($subemail)) == 0) { $form->setError($field, "* Email not entered"); } else if { /* Check if valid email address */ $regex = "^[_+a-z0-9-]+(\.[_+a-z0-9-]+)*" ."@[a-z0-9-]+(\.[a-z0-9-]{1,})*" ."\.([a-z]{2,}){1}$"; if(!eregi($regex,$subemail)) { $form->setError($field, "* Email invalid"); } else if ($subemail !== $subemail2) { $form->setError($field2, "* Emails does not match"); } $subemail = stripslashes($subemail); } /* Check if email is already in use */ else($database->emailTaken($subemail)) { $form->setError($field, "* Email address already in use"); } And its referring to the { after the first else if. I have edited with the entire piece of code, what could i do now?

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• Conseqences of assigning self

  - by Vegar

  Hi, Found a piece of code today, that I find a little smelly... TMyObject.LoadFromFile(const filename: String); begin if fileExists(filename) then self := TSomeObjectStreamer.ReadObjectFromFile(filename); end; If this code works, it will atleast leak some memory, but does it work? Is OK to assign to self in this manner? What if the streamed object is of a different subclass then the original self? What if the streamed object is of a different class with no common ancestore to the original self?

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• MySQL locking problem

  - by teehoo

  I have a simple setup of a set of writers and a set of readers working with a MySQL ISAM table. The writers are only inserting rows while the readers are only checking for new rows. OK, so I know that I don't need a lock in this situation, since I'm not modifying existing rows. However my Writers are accessing one more table that does need a lock. I piece of information seems irrelevant except for the following limitation stated in the MySQL documentation: A session that requires locks must acquire all the locks that it needs in a single LOCK TABLES statement. While the locks thus obtained are held, the session can access only the locked tables. For example, in the following sequence of statements, an error occurs for the attempt to access t2 because it was not locked in the LOCK TABLES statement: So to access the table I want to insert rows into, I NEED to lock it, which is causing me performance problems. Any suggestions of how to get around this?

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• Unable to pass variable data

  - by JM4

  I am trying to use the following code to pass information to another site but it keeps giving me an error: Invalid Code: $a = $b->doIt("James",$_SESSION['JNum'],"Frank"); Valid Sample Code: $a = $b->doIt("James","123456","Frank"); In the first example, the page returns "number field is required". The second piece of sample code returns valid results. Do to the nature of this project though I need to pass the id number as they are stored in SESSION variables. What am I missing?

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• Given two lines on a plane, how to find integer points closest to their intersection?

  - by Lukasz Lew

  I can't solve it: You are given 8 integers: A, B, C representing a line on a plane with equation A*x + B*y = C a, b, c representing another line x, y representing a point on a plane The two lines are not parallel therefore divide plane into 4 pieces. Point (x, y) lies inside of one these pieces. Problem: Write a fast algorithm that will find a point with integer coordinates in the same piece as (x,y) that is closest to the cross point of the two given lines. Note: This is not a homework, this is old Euler-type task that I have absolutely no idea how to approach. Update: You can assume that the 8 numbers on input are 32-bit signed integers. But you cannot assume that the solution will be 32 bit.

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• Difficulties of transforming a Java program to another language (or vice versa)

  - by NomeN

  Is there anything simple Java can't do that can be done in a similar language or vice versa? Lets say you have a piece of software in language X and you rewrite it entirely to Java (or the other way around), what are the little things that would seriously hamper the translation? At first I was thinking of comprehensions or multiple exit loops, but these are easily rewritten with a for_each loop with an if statement and a local variable respectively. Maybe Exceptions? But which language does not have a similar construct? Polymorphism? But I don't see how I could show that in a few lines. I'm looking for a short and sweet example, that would give some serious headache to work around.

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• [Java] Implement a RSA algorithm

  - by Robin Monjo

  Hello everyone. I want to implement a RSA algorithm to encrypt an image (byte[]). To generate my two keys I used this piece of code : KeyPairGenerator keygen = KeyPairGenerator.getInstance("RSA"); keygen.initialize(512); keyPair = keygen.generateKeyPair(); Once public and private key are generated, I would like to show them to the user so he can distribute the public key and use the private key to decode. How can I get back those key ? Using keygen.getPrivateKey() and keygen.getPublicKey() give me all the information of the RSA algorithm, not only the keys I need. Thanks

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• SWT Composite consructor throws IllegalArgumentException on a non-null argument

  - by Alexey Romanov

  This piece of code (in Scala) val contents = { assert(mainWindow.detailsPane != null) new Composite(mainWindow.detailsPane, SWT.NONE) } throws an exception: Exception occurred java.lang.IllegalArgumentException: Argument not valid at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.SWT.error(Unknown Source) at org.eclipse.swt.widgets.Widget.error(Unknown Source) at org.eclipse.swt.widgets.Widget.checkParent(Unknown Source) at org.eclipse.swt.widgets.Widget.<init>(Unknown Source) at org.eclipse.swt.widgets.Control.<init>(Unknown Source) at org.eclipse.swt.widgets.Scrollable.<init>(Unknown Source) at org.eclipse.swt.widgets.Composite.<init>(Unknown Source) at main.scala.NodeViewPresenter$NodeViewImpl.<init>(NodeViewPresenter.scala:41) According to the documentation, IllegalArgumentException should only be thrown when the parent is null, but I am checking for that. detailsPane is a CTabFolder. Can anybody say why this could happen?

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• More ruby-like solution to this problem?

  - by RaouL

  I am learning ruby and practicing it by solving problems from Project Euler. This is my solution for problem 12. # Project Euler problem: 12 # What is the value of the first triangle number to have over five hundred divisors? require 'prime' triangle_number = ->(num){ (num *(num + 1)) / 2 } factor_count = ->(num) do prime_fac = Prime.prime_division(num) exponents = prime_fac.collect { |item| item.last + 1 } fac_count = exponents.inject(:*) end n = 2 loop do tn = triangle_number.(n) if factor_count.(tn) >= 500 puts tn break end n += 1 end Any improvements that can be made to this piece of code?

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• How to detect exception when executing Javascript in NPAPI plugin?

  - by Jordfräs

  In a plug-in I am using NPN_Evaluate() to execute some Javascript. How can I detect wether the Javascript raises an exception? Basically I want to execute any piece of Javascript and get the result from it or detect if it raised an exception. I tried wrapping my Javascript code like this: try { // Injected Javascript code here } catch (exc) { exc; } That way the result from NPN_Evaluate() will be an NPObject* containing a property "message" with the exception message if something goes wrong. But how can I know that it is an exception? It might as well be a result from the injected Javascript code. Am I approaching this the wrong way? Can I detect an exception without catching it in Javascript and returning the exception as the result?

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• Dynamic classloading fails on runtime

  - by Henrik Paul

  I have the following snippet of java code: final Class<?> junitCoreClass = AccessController.doPrivileged( new PrivilegedAction<URLClassLoader>() { @Override public URLClassLoader run() { return new URLClassLoader(new URL[] { junitJarUrl }); } }).loadClass("org.junit.runner.JUnitCore"); System.out.println(junitCoreClass.getName()); final JUnitCore junitCore = (JUnitCore) junitCoreClass.newInstance(); This compiles fine. But when I try to run it, something weird happens; a java.lang.NoClassDefFoundError is thrown on that last line, referring to the class just loaded. The weird part is, the println prints the exact class name. I checked that if I keep the reference as an Object and manipulate it only through reflection, everything's fine, so the offending piece of code must be the explicit cast. Can someone explain to me why this happens, and also tell me how I can achieve what I'm trying to do?

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• how to fill a part of a circle using PIL?

  - by valya

  hello. I'm trying to use PIL for a task but the result is very dirty. What I'm doing is trying to fill a part of a piece of a circle, as you can see on the image. Here is my code: def gen_image(values): side = 568 margin = 47 image = Image.open(settings.MEDIA_ROOT + "/i/promo_circle.jpg") draw = ImageDraw.Draw(image) draw.ellipse((margin, margin, side-margin, side-margin), outline="white") center = side/2 r = side/2 - margin cnt = len(values) for n in xrange(cnt): angle = n*(360.0/cnt) - 90 next_angle = (n+1)*(360.0/cnt) - 90 nr = (r * values[n] / 5) max_r = r min_r = nr for cr in xrange(min_r*10, max_r*10): cr = cr/10.0 draw.arc((side/2-cr, side/2-cr, side/2+cr, side/2+cr), angle, next_angle, fill="white") return image

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