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• how to apply Discrete wavelet transform on image

  - by abuasis

  I am implementing an android application that will verify signature images , decided to go with the Discrete wavelet transform method (symmlet-8) the method requires to apply the discrete wavelet transform and separate the image using low-pass and high-pass filter and retrieve the wavelet transform coefficients. the equations show notations that I cant understand thus can't do the math easily , also didn't know how to apply low-pass and high-pass filters to my x and y points. is there any tutorial that shows you how to apply the discrete wavelet transform to my image easily that breaks it out in numbers? thanks alot in advance.

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• How can a large number of developers write software together without either a cumbersome process or

  - by Mark Robinson

  I work at a company with hundreds of people writing software for essentially the same product. The quality of the software has to be high because so many people depend on it (not least the developers themselves). Because of this every major issue has resulted in a new check - either automated or manual. As a result the process of delivering software is becoming ever more burdensome. So that requires more developers which... well you can see it is a vicious circle. We now have a problem with releasing software quickly - the lead time even to change one line of code for a very serious issue is at least one day. What techniques do you use to speed up the delivery of software in a large organization, while still maintaining software quality?

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• Make a steady automata in javascript

  - by RobertWHurst

  I'm working on a javascript game and I've got an automata system controlling game time and sprite animation as well as giving a hand to the path finding system for timing and such. My problem is on slow browsers the javascript loop I'm using for counting the time is not very accurate. It tends to jump around a lot. I there a way to force the loop to run consistantly at 30 fps? The automata can drop frames if it needs to catch up so if the solution requires droping frames thats ok.

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• Rails Unit Testing with MyISAM Tables

  - by tadman

  I've got an application that requires the use of MyISAM on a few tables, but the rest are the traditional InnoDB type. The application itself is not concerned with transactions where it applies to these records, but performance is a concern. The Rails testing environment assumes the engine used is transactional, though, so when the test database is generated from the schema.rb it is imported with the same engine. Is it possible to over-ride this behaviour in a simple manner? I've resorted to an awful hack to ensure the tables are the correct type by appending this to test_helper.rb: (ActiveRecord::Base.connection.select_values("SHOW TABLES") - %w[ schema_info ]).each do |table_name| ActiveRecord::Base.connection.execute("ALTER TABLE `#{table_name}` ENGINE=InnoDB") end Is there a better way to make a MyISAM-backed model be testable?

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• organise javascript code based on page

  - by David

  Hi I am relatively new to javascript development. At the moment I have a single javascript file with lots of little misc bits of code that get called in different part of the website. For example I have an event handler for some google maps stuff that is only called on 1 single page, I have some validation stuff for my contact page etc etc. My question, is how best to organise this code - given that each page only requires very little code but its different and specific per page? Oh, I am using jquery if that makes a difference.

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• Creating a proper CMS thoughts

  - by dallasclark

  I'm just about to expand the functionality of our own CMS but was thinking of restructuring the database to make it simpler to add/edit data types and values. Currently, the CMS is quite flat - the CMS requires a field in the database for every type of stored value. The first option that comes to mind is simply a table which keeps the data types (ie: Address 1, Suburb, Email Address etc) and another table which holds values for each of these data types. Just like how Wordpress keeps values in the 'options' table, serialize would be used to store an array of values. The second option is how Drupal works, the CMS creates tables for every data type. Unlike Wordpress, this can be a bit of an overkill but really useful for SQL queries when ordering and grouping by a particular value. What's everyone's thoughts?

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• Storing Templates and Object-Oriented vs Relational Databases

  - by syrion

  I'm designing some custom blog software, and have run into a conundrum regarding database design. The software requires that there be multiple content types, each of which will require different entry forms and presentation templates. My initial instinct is to create these content types as objects, then serialize them and store them in the database as JSON or YAML, with the entry forms and templates as simple strings attached to the "contentTypes" table. This seems cumbersome, however. Are there established best practices for dealing with this design? Is this a use case where I should consider an object database? If I should be using an object database, which should I consider? I am currently working in Python and would prefer a capable Python library, but can move to Java if need be.

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• How to check when Shell32.Folder.CopyHere() is finished

  - by Jelle Capenberghs

  I need to unzip en zip some files in my application using Shell32. Right now, I use srcFolder.CopyHere(destFolder.Items()) to achieve this. However, my next line of code requires the newly made ZIP-file. But since the CopyHere method is Async, how can I check when it in finished? Right now I use a Thread.Sleep for around 500 ms which is enough for my computer to finish creating the ZIP file, but it's not good code imo. Any ideas? More info/code can be provided if necessary.

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• Are there any modern platforms with non-IEEE C/C++ float formats?

  - by Patrick Niedzielski

  Hi all, I am writing a video game, Humm and Strumm, which requires a network component in its game engine. I can deal with differences in endianness easily, but I have hit a wall in attempting to deal with possible float memory formats. I know that modern computers have all a standard integer format, but I have heard that they may not all use the IEEE standard for floating-point integers. Is this true? While certainly I could just output it as a character string into each packet, I would still have to convert to a "well-known format" of each client, regardless of the platform. The standard printf() and atod() would be inadequate. Please note, because this game is a Free/Open Source Software program that will run on GNU/Linux, *BSD, and Microsoft Windows, I cannot use any proprietary solutions, nor any single-platform solutions. Cheers, Patrick

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• In-memory Database in Excel

  - by user329174

  Hello, I am looking for a way to import a datatable from Access into an Excel variable and then run queries through this variable to speed up the process. I am trying to migrate from C# .NET where I read a data table from an access database into memory and then used LINQ to query this dataset. It is MUCH faster than how I have it currently coded in VBA where I must make lots of calls to the actual database, which is slow. I have seen the QueryTable mentioned, but it appears that this requires pasting the data into the excel sheet. I would like to keep everything in memory and minimize the interaction between the Excel Sheet and the VBA code as much as possible. I wish we didn't need to use Excel+VBA to do this, but we're kind of stuck with that for now. Thanks for the help!

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• Where can I found GD compatible fonts?

  - by Casidiablo

  Hello there! I'm using GD to display some text. The default font is Courier (or something similar)... I want to use another font and I found this function: imageloadfont that requires a .gdf file. I've search on Google to see if I find some nice fonts, but I didn't find anything. I see there's a script to convert a PNG file to a GDF, but I can't waste too much time so I'd like to know where can I get some nice fonts, or maybe there's another easier way to do what I want. Thanks for reading.

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• Using a table-alias in Kohana queries?

  - by Aristotle

  I'm trying to run a simple query with $this->db in Kohana, but am running into some syntax issues when I try to use an alias for a table within my query: $result = $this->db ->select("ci.chapter_id, ci.book_id, ci.chapter_heading, ci.chapter_number") ->from("chapter_info ci") ->where(array("ci.chapter_number" => $chapter, "ci.book_id" => $book)) ->get(); It seems to me that this should work just fine. I'm stating that "chapter_info" ought to be known as "ci," yet this isn't taking for some reason. The error is pretty straight-forward: There was an SQL error: Table 'gb_data.chapter_info ci' doesn't exist - SELECT `ci`.`chapter_id`, `ci`.`book_id`, `ci`.`chapter_heading`, `ci`.`chapter_number` FROM (`chapter_info ci`) WHERE `ci`.`chapter_number` = 1 AND `ci`.`book_id` = 1 If I use the full table name, rather than an alias, I get the expected results without error. This requires me to write much more verbose queries, which isn't ideal. Is there some way to use shorter names for tables within Kohana's query-builder?

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• Calling https process from ASP Net

  - by David M

  I have an ASP NET web server application that calls another process running on the same box that creates a pdf file and returns it. The second process requires a secure connection via SSL. The second process has issued my ASP NET application with a digital certificate but I still cannot authenticate, getting a 403 error. The code is a little hard to show but here's a simplified method ... X509Certificate cert = X509Certificate.CreateFromCertFile("path\to\cert.cer"); string URL = "https://urltoservice?params=value"; HttpWebRequest req = HttpWebRequest.Create(URL) as HttpWebRequest; req.ClientCertificates.Add(cert); req.Credentials = CredentialCache.DefaultCredentials; req.PreAuthenticate = true; /// error happens here WebResponse resp = req.GetResponse(); Stream input = resp.GetResponseStream(); The error text is "The remote server returned an error: (403) Forbidden." Any pointers are welcome.

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• ActiveMQ - Removing queues programatically

  - by Eduardo Z.

  Fellow StackOverflowers, is there a way for me to remove a queue or a topic in ActiveMQ programatically? I am using ActiveMQ's standard persistency, and my application requires that, on startup, all new queues be dynamically re-created (unless there are messages stored in the queue, in which case, the queue should remain to exist). I am also creating all queues programatically through sessions. Is there an equivalent to that procedure, only to delete a queue? Querying and iterating through the existing queues would also be useful, but i haven't found a way to do that yet. Please help an ActiveMQ noob! =)

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• Not Seeing Ajax Requests In Firebug If Header Has Been Modified

  - by FluidFoundation

  Hey braintrust, I'm making an ajax call using jQuery's library to an api, which requires a username and password encoded to base64 be added to the header. here's a basic example: $.ajax({ type: "GET", contentType: 'application/json', beforeSend:function(xhr){ xhr.setRequestHeader("Authentication", "Basic " + base64EncodedValue); } url: 'https://api.company.com/uri/', complete: function(result) { alert(result); } }); But when this fires off, I get a black alert box, so it doesn't appear as if something is coming back. There is no log in the Firebug console that a get ajax request was done. However, if I remove the beforeSend option, I do see the ajax request get logged, but the request gets back a 'not authorized', so it definitely hit the right place. Any ideas on why it's not showing up in Firebug so I can verify the headers are being sent out correctly?

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• Setting multiple datasource for a report in Asp.net

  - by Nandini

  Hi all, I have a report whose data is derived from two stored procedures.so i need to set these two datasources for generating the report.But the reports which have only one SP, ie.only one datasource works properly. For setting the datasource, i wrote code like this: dim reportdocument as ReportDocument Dim reportPath As String = Server.MapPath("CrystalRpts\Report.rpt") ReportDocument.Load(reportPath) 'Function for Setting the Connection SetDBLogonForReport(MyConnectionInfo, ReportDocument) dim dt1 as datatable=Datasource1 dim dt2 as datatable=Datasource2 dt1.merge(dt2) reportdocument.setDataSource(dt1) CrystalReportViewer.ReportSource=reportdocument But, the report is not generating.it shows the following error The Report requires additional information Servername:- Server Database:- Database UserID:- Password:- But the reports which have only one SP, ie.only one datasource works properly.What colud be reason for this error?

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• Forcing Spring web services to add the xsd namespace to the response

  - by David Rabinowitz

  I'm using the Spring WS version 1.5.8. My response looks like this: <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"> <SOAP-ENV:Header/> <SOAP-ENV:Body> ... </SOAP-ENV:Body> </SOAP-ENV:Envelope> However, my client (whom I integrate with) requires that I will add more namespace declerations in order for the parsing to succeed: <?xml version="1.0" encoding="UTF-8"?> <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <soapenv:Body> ... </soapenv:Body> </soapenv:Envelope> How can I do it?

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• How to skip "Loose Object" popup when running 'git gui'

  - by Michael Donohue

  When I run 'git gui' I get a popup that says This repository currently has approximately 1500 loose objects. It then suggests compressing the database. I've done this before, and it reduces the loose objects to about 250, but that doesn't suppress the popup. Compressing again doesn't change the number of loose objects. Our current workflow requires significant use of 'rebase' as we are transitioning from Perforce, and Perforce is still the canonical SCM. Once Git is the canonical SCM, we will do regular merges, and the loose objects problem should be greatly mitigated. In the mean time, I'd really like to make this 'helpful' popup go away.

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• Difficulty thinking of properties for FsCheck

  - by Benjol

  I've managed to get xUnit working on my little sample assembly. Now I want to see if I can grok FsCheck too. My problem is that I'm stumped when it comes to defining test properties for my functions. Maybe I've just not got a good sample set of functions, but what would be good test properties for these functions, for example? //transforms [1;2;3;4] into [(1,2);(3,4)] pairs : 'a list -> ('a * 'a) list //' //splits list into list of lists when predicate returns // true for adjacent elements splitOn : ('a -> 'a -> bool) -> 'a list -> 'a list list //returns true if snd is bigger sndBigger : ('a * 'a) -> bool (requires comparison)

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• How do I reuse code in Zend Framework

  - by Mario

  I am working on a web application which requires the user to login before they see or do anything. No part of this app should be accessible without being logged in. (Except of course, the login controller) Currently I am using sessions to handle the authentication and I have put code in each controller in the init() function to check if their session is valid. This was a temporary workaround, but it is redundant and inefficient. I would like my init() function to be similar to the following, but I am not sure how to achieve it: public function init() { // If user not logged in redirect to login controller $myLibrary = Zend_Library_MyLibrary(); $myLibrary->CheckAuth(); } So my question really has two parts: Where is the best place to store code that will be used in multiple controllers? How do I then call that function from a controller? Thanks.

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• Out of the box approach to upload XML file to the BIRT Server for Processing

  - by Paul

  Hello, I have the BIRT Report Server configured in TOMCAT and it works fine when running reports that require an XML datasource, but that XML file has be available on the network in order for the server to find it and run. Is there an out of the box configuration in the BIRT server that will prompt the user to upload the XML file directly to the server when they try to run a given report that requires an XML data source? This would be handy for users that have the XML datasource stored locally on their C drive and not have to move them to a network server in order to be read by BIRT. Thanks in advance. Paul

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• Connecting to TFS from iPhone

  - by Andrei

  Hi. I'm building this iPhone application to connect to a secured TFS server (one that requires authentication before letting you access its web services). When I access this server in a browser, the first thing it will do is ask me for credentials (username/password) and then connect me to the TFS server if those credentials are correct. I am using web services, as I don't think there is any other way to use TFS functionality for an outside platform...without changing stuff on the TFS host machine. So my questions are: Are there any web services that can be accessed to log into the TFS server? This authentication mechanism seems to be something common among multiple websites (I have seen it in other websites). Is there a way to replicate that authentication mechanism by sending an HTTP request? Is there a way to replicate this authentication procedure in any way? Thanks!

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• Advantages of three-way automatic merging vs. two-way

  - by bnsmith

  I'm interested in understanding two-way and three-way merging of source code files. Based on what I've read, two-way merging has some "crippling weaknesses" compared to three-way merging. What I'd really like to see are one or two simple, concrete examples of cases where three-way merging is able to automatically merge something from a branch to the trunk without producing conflicts, while two-way merging falls down and requires a bunch of manual intervention to get the code merged. Any links to blog posts or even references to books would be appreciated (yes, I have Googled this for an hour or so). Thanks!

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• Using Fluent NHibernate with Castle Windsor and the NHibernate Facility

  - by Andrew

  Ive managed to get Fluent NHibernate 1.1 playing nicely with Castle Windsor 2.1. This involved me recompiling NHibernate.ByteCode.Castle.dll and it all works fine. Ive managed to do the same thing this time with Castle Windsor 2.5, havent tried it yet but its not complaining which is good enough for me at the moment. However Im also using the Castle NHibernate Facility and that is another story. The version of the NHibernate Facility that is compatible with Castle 2.5 requires a much later version of NHibernate. Is there an easy way to get the NHibernate Facility to work with NHibernate 2.1 and Castle Core 2.5?

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• Please list here your deliberate practices in software development...

  - by JDelage

  What are your deliberate practices in relation with your work as a software developer / professional, or as a CS student? Deliberate practice are exercise and repetitions targeted specifically at an individual's weak points and meant to consistently stretch / grow someone's ability. It was described in this Anders Ericsson paper. To qualify as a deliberate practice, the exercise must satisfy the following: Is not inherently enjoyable. Is not play or paid practice. Is relevant to the skill being developed. Is not simply watching the skill being performed. Requires effort and attention from the learner. Often involves activities selected by a coach or teacher to facilitate learning. Please answer with one practice per answer. I'll seed the question with one possible answer.

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