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  • Should Competent Programmers be "Mathematically Inclined"

    - by Abhijeet Patel
    From a blog post by Jeff Atwood of the same title, I can tell from personal experience that it's much more easier to grasp math after having worked professionally as a developer for a while. I appreciate math much more as I can see it's real world applicability. Can you recommend any resources/books that can help become familiar and comfortable with the kind of math concepts that developers should be familiar with for being well rounded and effective developers.

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  • IEEE 1003.1 licenses compared

    - by LarsOn
    Software or real people can technically copy a BSD software, install it and sell it. What are technical and licence advantages and disadvantages compared to taking Linux or other 1003.1 and delivering or selling it? Which license is most flexible for instance when selling or delivering a computer BSD licence seems more flexible than Linux and other specs also interesting (Haiku and likewise). Typical case someone wants a computer with which we can deliver BSD or Linux quite similar weighing licence flexibility (BSD seems best licence) and functions (Linux seems have most functions)

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  • Does mixing Quartz and OpenGL-ES cause big performance degrade??

    - by Eonil
    I have a plan to make a game using OpenGL for 3D world view, and CALayer(or UIView) for HUD UI. It's easy to imagine performance degrade from mixing them, but the document which mention this impact disappeared: http://developer.apple.com/iphone/library/technotes/tn2008/tn2230.html I cannot find the document on current version of SDK reference. And I got this document: http://gamesfromwithin.com/gdc-2010-the-best-of-both-worlds-using-uikit-with-opengl If you experienced about this, please let me know about performance impact on current SDK.

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  • What is the purpose of vshost.exe file?

    - by Milen
    When I create and compile a hello world application in C#, I get three files in the Debug folder apart from the main output exe (eg: HelloWorld.exe) 1. HelloWorld.vshost.exe 2. HelloWorld.pdb 3. HelloWorld.vshost.exe.manifest What are these files and what purpose do they serve?

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  • bluetooth file send.

    - by cheesebunz
    i'm new to bluetooth development and i found the 32netfeet . Right now i'm able to search for bluetooth devices nearby and connect to them but how do i send a file e.g SendTest.txt? I tried buttonclick event using the OBEX but i don't understand this is my example code: using InTheHand.Net; using InTheHand.Net.Sockets; using InTheHand.Net.Bluetooth; namespace BluetoothIntheHand { public partial class Form2 : Form { private Guid service = BluetoothService.DialupNetworking; private BluetoothClient bluetoothClient; public Form2() { InitializeComponent(); } private void btnSearch_Click(object sender, EventArgs e) { BluetoothRadio.PrimaryRadio.Mode = RadioMode.Discoverable; BluetoothRadio myRadio = BluetoothRadio.PrimaryRadio; lblSearch.Text = "" + myRadio.LocalAddress.ToString(); bluetoothClient = new BluetoothClient(); Cursor.Current = Cursors.WaitCursor; BluetoothDeviceInfo[] bluetoothDeviceInfo = { }; bluetoothDeviceInfo = bluetoothClient.DiscoverDevices(10); comboBox1.DataSource = bluetoothDeviceInfo; comboBox1.DisplayMember = "DeviceName"; comboBox1.ValueMember = "DeviceAddress"; comboBox1.Focus(); Cursor.Current = Cursors.Default; } private void btnConnect_Click(object sender, EventArgs e) { if (comboBox1.SelectedValue != null) { try { bluetoothClient.Connect(new BluetoothEndPoint((BluetoothAddress)comboBox1.SelectedValue, service)); MessageBox.Show("Connected"); } catch (Exception ex) { MessageBox.Show(ex.Message); } } } private void btnSend_Click(object sender, EventArgs e) { bluetoothClient.Connect(new BluetoothEndPoint((BluetoothAddress)comboBox1.SelectedValue, service)); String addr = "112233445566"; Uri uri = new Uri("obex://"+@"SendTest.txt"); ObexWebRequest req= new ObexWebRequest(uri); ObexWebResponse rsp; } I found the guide but don't really know how to convert to C# ' The host part of the URI is the device address, e.g. IrDAAddress.ToString(), ' and the file part is the OBEX object name. Dim addr As String = "112233445566" Dim uri As New Uri("obex://" & addr & "/HelloWorld2.txt") Dim req As New ObexWebRequest(uri) Using content As Stream = req.GetRequestStream() ' Using a StreamWriter to write text to the stream... Using wtr As New StreamWriter(content) wtr.WriteLine("Hello World GetRequestStream") wtr.WriteLine("Hello World GetRequestStream 2") wtr.Flush() ' Set the Length header value req.ContentLength = content.Length End Using ' In this case closing the StreamWriter also closed the Stream, but ... End Using Dim rsp As ObexWebResponse = CType(req.GetResponse(),ObexWebResponse) Console.WriteLine("Response Code: {0} (0x{0:X})", rsp.StatusCode)

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  • recaptcha still submits form when one word invalid

    - by luckytaxi
    Um so I was in for a little bit of a surprise tonight. I spent a good 20 mins trying to figure out why I was able to submit a form knowing that what I entered into the recaptcha field was invalid. Is it true that you don't need to input the exact words it displays? If it shows me two words and I misspelled one of the words, I still pass validation? Same goes if "hello world" and I input "hell man" it still works.

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  • Tornado or Django works with CGI ?

    - by xRobot
    Hi at all, Tornado is a webserver + framework like Django but for real-time features. On my server I don't have a python module or wsgi module so I thought CGI. Is there a way to get Tornado ( or Django ) works by using CGI folder ? If yes, Could you explain me how do I do that ?

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  • Best way to generate report using multiple databases

    - by Vinaaven
    Hi All, I am new to the reporting world. Wanted to know which is the right solution to about for generating a single report by querying for data from multiple databases. We are planning to use some reporting solution like Jasper Reports or BIRT. Generally the databases are going to be postgresql. Please do feel free to let me know about any other better solutions as well. Thanks.

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  • Perl Threads with binmode

    - by jAndy
    Hi Folks, this call my $th = threads->create(\&print, "Hello thread World!\n"); $th->join(); works fine. But as soon as I add binmode(STDOUT, ":encoding(ISO-8859-1)"); to my script file, I get an error like "segmentation fault", "access denied". What is wrong to define an encoding type when trying to call a perl thread? Kind Regards --Andy

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  • Eclipse Android Mac 10.4 problem, dyld: Symbol not found: _open$UNIX2003

    - by Manic
    Hello I have just set up the Eclipse Android SDK environment. I tried creating a basic HelloWorld app by following this page http://developer.android.com/guide/tutorials/hello-world.html As soon as i set up the project i get get this error in the console [2010-06-09 23:12:22 - Helloworld] dyld: Symbol not found: _open$UNIX2003 [2010-06-09 23:12:22 - Helloworld] Referenced from: /usr/lib/android-sdk-mac_86/platforms/android-3/tools/aapt [2010-06-09 23:12:22 - Helloworld] Expected in: /usr/lib/libSystem.B.dylib [2010-06-09 23:12:22 - Helloworld] Is it something to do do with my MacOS version ? plz hlp ! :S

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  • Fragment Shader Eye-Space unscaled depth coordinate

    - by Ben Jones
    I'm trying to use the unscaled (true distance from the front clipping plane) distance to objects in my scene in a GLSL fragment shader. The gl_FragCoord.z value is smaller than I expect. In my vertex shader, I just use ftransform() to set gl_Position. I'm seeing values between 2 and 3 when I expect them to be between 15 and 20. How can I get the real eye-space depth? Thanks!

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  • Sharing a file from Android to Gmail or to Dropbox

    - by Calaf
    To share a simple text file, I started by copying verbatim from FileProvider's manual page: <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <provider android:name="android.support.v4.content.FileProvider" android:authorities="com.mycorp.helloworldtxtfileprovider.MainActivity" android:exported="false" android:grantUriPermissions="true" > <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/my_paths" /> </provider> <activity android:name="com.mycorp.helloworldtxtfileprovider.MainActivity" ... Then I saved a text file and used, again nearly verbatim, the code under Sending binary content. (Notice that this applies more accurately in this case than "Sending text content" since we are sending a file, which happens to be a text file, rather than just a string of text.) For the convenience of duplication on your side, and since the code is in any case so brief, I'm including it here in full. public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); String filename = "hellow.txt"; String fileContents = "Hello, World!\n"; byte[] bytes = fileContents.getBytes(); FileOutputStream fos = null; try { fos = this.openFileOutput(filename, MODE_PRIVATE); fos.write(bytes); } catch (IOException e) { e.printStackTrace(); } finally { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } File file = new File(filename); Intent shareIntent = new Intent(); shareIntent.setAction(Intent.ACTION_SEND); shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); shareIntent.setType("application/txt"); startActivity(Intent.createChooser(shareIntent, getResources().getText(R.string.send_to))); file.delete(); } } Aside from adding a value for send_to in res/values/strings.xml, the only other change I did to the generic Hello, World that Eclipse creates is to add the following in res/xml/my_paths.xml (as described on the page previously referenced. <paths xmlns:android="http://schemas.android.com/apk/res/android"> <Files-path name="files" path="." /> </paths> This code runs fine. It shows a list of intent recipients. But sending the text file to either Dropbox or to Gmail fails. Dropbox sends the notification "Uploading to Dropbox" followed by "Upload failed: my_file.txt". After "sending message.." Gmail sends "Couldn't send attachment". What is wrong?

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  • Kohana - Facebook app URL

    - by booze2go
    Hi Guys, I'm developing my first facebook app on kohana 2.3.x at the moment and I noticed that a usual app url should look like this: http://apps.facebook.com/{my_app}/{controller}/{method} But in my app it shows the real url. http://mydomain.com/{controller}/{method} Any idea how to fix that in Kohana? Thanks in advance!

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  • How can I get IE8 to accept a css :before tag?

    - by William Calleja
    I have the following CSS code .editable:before { content: url(../images/icons/icon1.png); padding-right:5px; } this is used in conjuntion with the following markup: <span class="editable"></span> In every other blessed browser in the world my icon is appearing, but IE8 seems to have a problem with this. Isn't the :before pseudo-element CSS2? isn't content: also a CSS2 command? what gives?

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  • VS2010 ultimate DataBase Project + SQL Server 2008: Updating Project from Database

    - by josecortesp
    Hello everyone, this is a quick question: I have this Database Project in a Web app solution with the real database. I want to update the database using SQL server managment studio, and then update the corresponding VS project. This can be done? I know that you can update the scripts in the project, but I'm not the SQL kind of guy, i rather do this changes using Mangment studio... Thanks in advance

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  • Enumerate registered namespaces of a PHP DOMDocument object

    - by zneak
    Hello world, For one of my projects, I'm using the DOMDocument class to load and manipulate XML documents. I'd need to retrieve every namespace used in the document; however, I can't find how I'd do that. The DOMDocument class has methods to get the namespace prefix of an URI or the URI of a namespace prefix, but I've seen nothing to actually enumerate registered namespaces. The SimpleXML library has a getNamespaces() method for that. Is there an equivalent for DOMDocument?

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  • Visual Studio Lightswitch Beta2

    - by Elmex
    What are your experiences with Beta2 of Visual Lightswitch? Can it already be used for real life projects? Does anybody know, when the final (RTM) version will be out? I am very intersting in using Lightswitch in the future for RAD, but I am a litte bit self-conscious, if the tool is flexible enough for my dividual requirements and if a Lightswitch solution can be extended with own code !? Can it be mixed with "normal" Silverlight?

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  • Unlimited Detail Graphics Engine

    - by daddz
    So I stumbled upon this "new" graphics engine/technology called Unlimited Detail. This seems to be pretty interesting granted it's real and not a fake. They have some videos explaining the technology but they only scratch the surface. What do you think about it? Is it programmatically possible? Or is it just a scam for investors?

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  • PHP/Java Bridge java.lang.NoSuchMethodException

    - by m1sk
    I have setup PHP/Java Bridge with working examples in netbeans tomcat directory. What doesnt work is using custom JAR Here is my code: package com.micha; public class Hello1Bean { public Hello1Bean() {} String hi() {return "This is my hello message";} String hello(String name) {return "Hello" + name;} } And the php code <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title></title> </head> <body> <?php require_once ("java/Java.inc"); $world = new Java("com.micha.Hello1Bean"); echo java_values($world->hi()); echo "Hello Working Thingy\n\n"; ?> </body> </html> When I check http://localhost:8084/JavaBridge/mytest.php: javax.servlet.ServletException: java.lang.RuntimeException: PHP Fatal error: Uncaught [[o:Exception]:"java.lang.Exception: Invoke failed: [[o:Hello1Bean]]->hi. Cause: java.lang.NoSuchMethodException: hi(). Candidates: [] VM: 1.6.0_25@http://java.sun.com/" at: #-6 php.java.bridge.JavaBridge.checkM(JavaBridge.java:1085) #-5 php.java.bridge.JavaBridge.Invoke(JavaBridge.java:1024) #-4 php.java.bridge.Request.handleRequest(Request.java:417) #-3 php.java.bridge.Request.handleRequests(Request.java:500) #-2 php.java.bridge.http.ContextRunner.run(ContextRunner.java:145) #-1 php.java.bridge.ThreadPool$Delegate.run(ThreadPool.java:60) #0 C:\Users\Micha\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\webapps\JavaBridge\java\Java.inc(232): java_ThrowExceptionProxyFactory->getProxy(2, 'com.micha.Hello...', 'T', true) #1 C:\Users\Micha\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\webapps\JavaBridge\java\Java.inc(360): java_Arg->getResult(true) #2 C:\Users\Micha\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\webapps\JavaBridge\java\Java.inc(366): java_Client->getWrappedResult(true) #3 C:\Users\Micha\.netbean in C:\Users\Micha\.netbeans\7.1.2\apache-tomcat-7.0.22.0_base\webapps\JavaBridge\java\Java.inc on line 195 php.java.servlet.fastcgi.FastCGIServlet.handle(FastCGIServlet.java:499) php.java.servlet.fastcgi.FastCGIServlet.doGet(FastCGIServlet.java:521) javax.servlet.http.HttpServlet.service(HttpServlet.java:621) javax.servlet.http.HttpServlet.service(HttpServlet.java:722) org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) php.java.servlet.PhpCGIFilter.doFilter(PhpCGIFilter.java:126) Before I had a ClassNotFoundException so it knows there is a a class but for some odd reason I cant call the function. ( if I replace "com.micha.Hello1Bean" with some class that doesnt exist then I get that exception)

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  • How to start with NOSQL using .net programming languages?

    - by Amr ElGarhy
    just was reading this article http://highscalability.com/blog/2010/3/23/digg-4000-performance-increase-by-sorting-in-php-rather-than.html And found this nice article http://wiki.apache.org/cassandra/DataModel I just want to know as a .net developer how to deal with NOSQL, and somethings like cassandra. I found that cassandra is apache product, is there something like this in microsoft world? or articles to know how to deal with cassandra using .net?

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  • trying to divide complex numbers, division by zero

    - by user553619
    I'm trying the program below to divide complex numbers, it works for complex numbers but not when the denominator is real (i.e, the complex part is zero). Division by zero occurs in this line ratio = b->r / b->i ;, when the complex part b->i is zero (in the case of a real denominator). How do I get around this? and why did the programmer do this, instead of the more straightforward rule for complex division The wikipedia rule seems to be better, and no division by zero error would occur here. Did I miss something? Why did the programmer not use the wikipedia formula?? Thanks /*! @file dcomplex.c * \brief Common arithmetic for complex type * * <pre> * -- SuperLU routine (version 2.0) -- * Univ. of California Berkeley, Xerox Palo Alto Research Center, * and Lawrence Berkeley National Lab. * November 15, 1997 * * This file defines common arithmetic operations for complex type. * </pre> */ #include <math.h> #include <stdlib.h> #include <stdio.h> #include "slu_dcomplex.h" /*! \brief Complex Division c = a/b */ void z_div(doublecomplex *c, doublecomplex *a, doublecomplex *b) { double ratio, den; double abr, abi, cr, ci; if( (abr = b->r) < 0.) abr = - abr; if( (abi = b->i) < 0.) abi = - abi; if( abr <= abi ) { if (abi == 0) { fprintf(stderr, "z_div.c: division by zero\n"); exit(-1); } ratio = b->r / b->i ; den = b->i * (1 + ratio*ratio); cr = (a->r*ratio + a->i) / den; ci = (a->i*ratio - a->r) / den; } else { ratio = b->i / b->r ; den = b->r * (1 + ratio*ratio); cr = (a->r + a->i*ratio) / den; ci = (a->i - a->r*ratio) / den; } c->r = cr; c->i = ci; }

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