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• Efficiently solving sparse matrices

  - by anon

  For solving spare matrices, in general, how big does the matrix have to be (as a rule of thumb) for methods like congraduate descent to be faster than brute force solvers (that do not take advantage o sparsity)?

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• A Question on Encapsulation.

  - by Bragaadeesh

  Hi, I know that encapsulation is binding the members and its behavior in one single entity. And it has made me think that the members have to be private. Does this mean if a class having public members is not following 100% Encapsulation rule? Thanks

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• Axis Rotation Question

  - by Leo

  By using left hand rule, I rotate one object left and right using y axis, and rotate up/down using x axis. After first object is rotated to the right, the up/down rotation should be using z axis. However, when I try to rotate using z axis, after the first rotation, it has the same effect when I rotate using y axis. Anyone has any ideas? Thanks

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• "For money, always decimal" ???

  - by Dryadwoods

  Well, the rule "For money, always decimal" isn't applied inside the Microsoft development team, because if it was: Namespace: Microsoft.VisualBasic Assembly: Microsoft.VisualBasic (in Microsoft.VisualBasic.dll) Financial.IPmt and all the other methods would receive/return decimal and not double as it is. Now I wonder if I can use this methods without worry with round mistakes? Should I use some other libraries to work with finances? If yes, could you point me some good ones (for C# use) ? Thank you.

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• Can have part of the domain name as a parameter in my routing rules?

  - by ajma

  I'd like to have a routing rule that accepted part of my domain name as a parameter. For example: {name}.mydomain.com/photos/{id} Is this even possible?

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• regular expression for string in c

  - by darkie15

  Hi All, I am working writing a regular expression used to validate string in C. Here is to what I have gone so far '^"[A-Za-z0-9]*[\t\n]*"$' for rules - A string should begin with double quotes - May not contain a newline character However, I am not able to capture the rule for allowing '\' or '"' in a string if preceded with '\'. Here is what I tried: '^"[A-Za-z0-9]*[\t\n]*[\\\|\\"]?"$' But this doesn't seem to work. What might be wrong with the regular expression here? Regards, darkie15

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• Why do some languages not use semicolons and braces?

  - by Incognito

  It is interesting that some languages do not use semicolons and braces, even though their predecessors had them. Personally, it makes me nervous to write code in Python because of this. Semicolons are also missing from Google's GO language, although the lexer uses a rule to insert semicolons automatically as it scans. Why do some languages not use semicolons and braces?

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• Smaller Chunks of Data

  - by Googler

  I am using a web service to fetch a large amount of data. While sending the request, i receive an error as: Error: ** Please request data in smaller chunks.** Is this a problem with the web services i am fetching the information or a normal rule for fetching the data through internet. May i know the cause of this problem and also how to send the data in smaller chunks to avoid this error.

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• how to refactor tricky logic involving consecutive sets?

  - by keruilin

  The rule at work here is that users can be awarded badges for a streak of 10, 20, and 30. If the user has a streak over 30, such as 40 or 50, then the logic must be that it only awards a 10-streak badge for 40 and a 20-streak badge for 50, and so on. def check_win_streak(streak) badge = 10 while badge < badge::MAX_STREAK_BADGE_SIZE do # MAX_STREAK_BADGE_SIZE = 30 if streak < badge then break end if (streak % badge == 0) then award_streak_badge(badge) end badge += 10 end end

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• javascript date validation

  - by Bharanikumar

  Assume in my text box user enter like 18-06-2010 , Validation RULE if date is greater then current date then program should through the validation error like , PELASE ENTER PAST OR CURRENT DATE, DONT CHOOSE FUTURE DATE , Thanks

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• Tiles-def xml put values with html tags

  - by weblearner

  in tiles def <tiles:insert definition="link"> <tiles:put name="name" value="rule^tm"/> </tiles:insert> Can i use anything like this inside put value html tag.

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• How do I use POST with htaccess rewriterule?

  - by GeoffreyF67

  I have a rewriterule in my htaccess file that looks like this: RewriteRule ^Signup$ /dst2/signup.php I would like to use POST instead of GET for the data that gets passed by this form. The rule above, however, sends the data as a GET. Is there a way to use a POST with a rewriterule? G-Man

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• Apache url rewrite problem

  - by Ankit

  requests ----- should be written to new url /institute/dps ----- /institute.php?slug=dps /institute/abc ----- /institute.php?slug=abc /institute/123 ----- /institute.php?slug=123 I am using following rule in .htaccess RewriteRule ^institute/(.*)$ /institute.php?slug=$1 However, it's not working. the page insitute.php get's execution, but the query string always comes empty. Any suggestions?

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• Rewriting URLs and "faking" folders

  - by ct2k7

  Hi, I'm trying use mod_rewrite to rewrite URLs from the following: http://www.site.com/one-two-file.php to http://www.site.com/one/two/file.php The folders don't exist, but "virtually" exist for the rewriting purpose. What rule do I used in this?

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• Connection hangs after time of inactivity

  - by Sinuhe

  In my application, Spring manages connection pool for database access. Hibernate uses these connections for its queries. At first glance, I have no problems with the pool: it works correctly with concurrent clients and a pool with only one connection. I can execute a lot of queries, so I think that I (or Spring) don't leave open connections. My problem appears after some time of inactivity (sometimes 30 minutes, sometimes more than 2 hours). Then, when Hibernate does some search, it lasts too much. Setting log4j level to TRACE, I get this logs: ... 18:27:01 DEBUG nsactionSynchronizationManager - Retrieved value [org.springframework.orm.hibernate3.SessionHolder@99abd7] for key [org.hibernate.impl.SessionFactoryImpl@7d2897] bound to thread [http-8080-Processor24] 18:27:01 DEBUG HibernateTransactionManager - Found thread-bound Session [org.hibernate.impl.SessionImpl@8878cd] for Hibernate transaction 18:27:01 DEBUG HibernateTransactionManager - Using transaction object [org.springframework.orm.hibernate3.HibernateTransactionManager$HibernateTransactionObject@1b2ffee] 18:27:01 DEBUG HibernateTransactionManager - Creating new transaction with name [com.acjoventut.service.GenericManager.findByExample]: PROPAGATION_REQUIRED,ISOLATION_DEFAULT 18:27:01 DEBUG HibernateTransactionManager - Preparing JDBC Connection of Hibernate Session [org.hibernate.impl.SessionImpl@8878cd] 18:27:01 TRACE SessionImpl - setting flush mode to: AUTO 18:27:01 DEBUG JDBCTransaction - begin 18:27:01 DEBUG ConnectionManager - opening JDBC connection Here it gets frozen for about 2 - 10 minutes. But then continues: 18:30:11 DEBUG JDBCTransaction - current autocommit status: true 18:30:11 DEBUG JDBCTransaction - disabling autocommit 18:30:11 TRACE JDBCContext - after transaction begin 18:30:11 DEBUG HibernateTransactionManager - Exposing Hibernate transaction as JDBC transaction [jdbc:oracle:thin:@212.31.39.50:30998:orcl, UserName=DEVELOP, Oracle JDBC driver] 18:30:11 DEBUG nsactionSynchronizationManager - Bound value [org.springframework.jdbc.datasource.ConnectionHolder@843a9d] for key [org.apache.commons.dbcp.BasicDataSource@7745fd] to thread [http-8080-Processor24] 18:30:11 DEBUG nsactionSynchronizationManager - Initializing transaction synchronization ... After that, it works with no problems, until another period of inactivity. IMHO, it seems like connection pool returns an invalid/closed connection, and when Hibernate realizes that, ask another connection to the pool. I don't know how can I solve this problem or things I can do for delimiting it. Any help achieving this will be appreciate. Thanks. EDIT: Well, it finally was due a firewall rule. Database detects the connection is lost, but pool (dbcp or c3p0) not. So, it tries to query the database with no success. What is still strange for me is that timeout period is very variable. Maybe the rule is specially strange or firewall doesn't work correctly. Anyway, I have no access to that machine and I can only wait for an explanation. :(

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• Rewrite URL, regex help...

  - by Tony

  Hello, I am using the following Rewrite URL: RewriteRule /([^/?.]+) /somedir/somefile.aspx\?Name=$1 [NC,L] which works great for my use, but I need to restrict it to only act on text that does not contain a filename... for example, if I use the url www.somedomain.com/SomeName it works fine, but it also fires if I use www.somedomain.com/TestPage.aspx So I am not sure if I need an additional Rewtire rule, or if the current one can be modified to disallow any text with an extension, for example. Any help with this regular expression would be greatly appreciated.

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• Which memory related Tomcat JVM startup parameters are worth tuning?

  - by knorv

  I'm trying to understand the fine art of tuning Tomcat memory settings. In this quest I have the following three questions: Which memory related JVM startup parameters are worth setting when running Tomcat? Why? What are useful rule-of-thumbs when fine-tuning the memory settings for a Tomcat installation? How do you monitor the memory consumption of your live Tomcat installation?

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• Navigation and Tab Bar both are in app, which model to follow?

  - by iPhoneDev

  Which model should I use, if my First view in Login view (NO Tab required) and then all other views are under Tab Bar. So as a rule should I create Navigation based template coz First view uses only Navigation not Tab Bar or is there any other way around? Please suggest First Screen with Nav bar in Top (MUST Needed) Second Screen Tab Bar view:

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• IIS7 Re-Write a .axd extension to different extension

  - by user324637

  I have an e-commerce application that using a .axd handler for the page extensions. I simply want to use IIS7 to create a rule that says .shop = .axd Can this be done? If so how should I go about it? Thanks

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• Making a rewriterule remove .php extension?

  - by Sam

  Hello, I have come up with a rewriterule to to go to any page on my website without typing in the .php extension because it is automatically added to the url. The rule is: RewriteRule ^(\w+)/?$ /$1.php It takes anything you type in my index and adds .php to it, so you can put in http://sampardee.com/index and it pulls up index.php Now my question is how to detect when a user enters http://sampardee.com/index.php and change it to http://sampardee.com/index How could I do so with a rewriterule?

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• Activating Webkit CSS3 animation using Javascript

  - by jeffreyveon

  I am looking to use Webkit CSS3 to move a absolutely positioned DIV from one location to another on the screen when a button is pressed, by changing its left and right CSS properties. However, all the examples for doing this that I saw use a static CSS rule to apply this transition. I don't know the new position before hand, so how do I apply this CSS3 transition dynamically?

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• Is there value in unit testing auto implemented properties

  - by ahsteele

  It seems exceptionally heavy handed but going by the rule anything publicly available should be tested should auto-implemented properties be tested? Customer Class public class Customer { public string EmailAddr { get; set; } } Tested by [TestClass] public class CustomerTests : TestClassBase { [TestMethod] public void CanSetCustomerEmailAddress() { //Arrange Customer customer = new Customer(); //Act customer.EmailAddr = "[email protected]"; //Assert Assert.AreEqual("[email protected]", customer.EmailAddr); } }

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• Can I not submit a form to a servlet from JSF?

  - by simpatico

  * Unable to find matching navigation case with from-view-id '/home.xhtml' for action 'MemoServlet' with outcome 'MemoServlet' I try to accomplish it through: <h:commandButton type="submit" value="add" action="MemoServlet"/> but all the tutorials in the world only do it with a bean, which i don't want. I've come across any navigation rule that accomplishes my request.

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• jQuery validate : multiple form, single validation

  - by I-M-JM

  Hi all I have 2 forms, namely (ids mentioned) 'add_product' and 'edit_product' Now I am using jQuery validation plug-in, both the forms have same validation (similar to mentioned in following example) jQuery("#add_product").validate({ rules: { name:"required", price:"number" }, messages: { name:"Please enter Plan Name", price:"Enter a valid number" } }); and jQuery("#edit_product").validate({ rules: { name:"required", price:"number" }, messages: { name:"Please enter Plan Name", price:"Enter a valid number" } }); I want to combine them into 1 rule/function, how can I achieve this? Thanks

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• How long is too long for a script to execute?

  - by Chris T

  What is the max time do you think is acceptable for a web script (PHP for example) to execute before it starts to become an annoyance for the user (on average)? I always thought that if the user has to wait more than 1 second for the page to load (this of course after images and css have been cached..this rule really only applies for subsequent requests) they would start to get annoyed.

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