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• How to merge two .iso images

  - by pgrytdal

  I am following this tutorial to install Android onto my computer VIA Virtual Box. My problem is, they want you to download liveandroidv0.3.iso.001 liveandroidv0.3.iso.002 then they want you to merge these two files with cat liveandroidv0.3.iso.001 liveandroidv0.3.iso.002 > liveandroidv0.3.iso in the Terminal. The problem is, when I run the command, I get the following output cat liveandroidv0.3.iso.001 liveandroidv0.3.iso.002 > liveandroidv0.3.iso cat: liveandroidv0.3.iso.001: No such file or directory cat: liveandroidv0.3.iso.002: No such file or directory So, I was wondering if there was an alternative way to merge these files? Or if you guy's could help me merge them this way? Extra info: OS: Ubuntu 12.10 I downloaded the files to my /downloads folder in my home directory.

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• How do I recover a .ogv on ext4?

  - by gsedej

  Hi! I have very a simple question. How to recover a .ogv file on my /home ext4 partition? I overwrote the .ogv file (I confused input and output in Arista transcoder). I did research. TestDisk can undelete files on FAT and NTFS, but not on EXT4. PhotoRec does not support .ogv recovering. Foremost also does not support .ogv More info: The file is located at: /home/gasper/Video/Webcam/2011-02-02-181200.ogv

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• iwconfig usage for WEP access point?

  - by johan elmander

  I would like to use my wifi doggle in my pc (ubuntu 12.04). I am able to connect to my access point through the GUI. I would like to do the same in the terminal. My access point uses WEP. So I typed the following commands iwconfig wlan0 mode managed key 6d6f6e6579 iwconfig wlan0 essid "AccessPoint" dhclient wlan0 after typing dhclient wlan0 it waits like 1-2 min then outputs nothing and cannot connect to the Access Point. iwconfig output: wlan0 IEEE 802.11bgn ESSID:"AccessPoint" Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm Retry long timit:7 RTS thr=2347 B Fragment thr:off Encryption key:6D6F-6E65-79 Power Management:off I would appreciate any suggestion

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• Form Validation, Dependant Drop Downs, Data Level Security in OWS for DotNetNuke - 5 Videos

  In this tutorial we demonstrate some very advanced techniques for building a car parts application in Open Web Studio. Throughout the tutorial we cover form input, validation, how to use dependant drop down lists, populating checkbox lists and introduce a new concept of data level security. Data level security allows you to control which data a user can access within a module. The videos contain: Video 1 - How to Setup Form Validation Video 2 - Car Parts Application, Assigning Security Roles into a Global Session Variable Video 3 - How to Build the Categories Module with Data Level Security Video 4 - How to Build the SubCategories Module and Use SubQuery Video 5 - How to Build the Car Parts List Module Total Time Length: 44min 19secsDid you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Writing to a structured buffer with a compute shader (D3D11)

  - by Vertexwahn

  I have some problems writing to a structured buffer. First I create a structured buffer that is filled with float values beginning from 0 to 99. Afterwards a copy the structured buffer to a CPU accessible buffer is made to print the content of the structured buffer to the console. The output is as expected (Numbers 0 to 99 appear on the console). Afterwards I use a compute shader that should change the contents of the structured buffer: RWStructuredBuffer<float> Result : register( u0 ); [numthreads(1, 1, 1)] void CS_main( uint3 GroupId : SV_GroupID ) { Result[GroupId.x] = GroupId.x * 10; } But the compute shader does not change the contents of the structured buffer. The source code can be found here (main.cpp): https://bitbucket.org/Vertexwahn/cmakedemos/src/4abb067afd5781b87a553c4c720956668adca22a/D3D11ComputeShader/src/main.cpp?at=default FillCS.hlsl: https://bitbucket.org/Vertexwahn/cmakedemos/src/4abb067afd5781b87a553c4c720956668adca22a/D3D11ComputeShader/src/FillCS.hlsl?at=default

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• What is the best wrapping strategy ?

  - by Riduidel

  Hi, I'm planning to integrate an external tool (ffmpeg in my particular case, but it could be anything, in fact, as lolng as its tasks are long running ones). This tool has a lot of command-line parameters. For now, I've done to simple things with it, already requiring me a good bunch of class writing, to embed all the information it can return to me. I now face the even more complex task of having to send it a bunch of parameters and to handle possible errors. So, what is a best way for that ? Create classes containing all possible options Relying upon a reverse equivalent of commons-cli / CliBuilder / OptionParser Directly write all options from user input Obiwan Kenobi powers (or anything I don't even know about) Please notice I do it in an uncommon language (for the sake of me, don't ask me what it is, as it looks like a desperate and sterile union between CoffeeScript and lua), as a consequence, there can be no framework doing what I want in the language I use.

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• How to transform mesh components?

  - by Lea Hayes

  I am attempting to transform the components of a mesh directly using a 4x4 matrix. This is working for the vertex positions, but it is not working for the normals (and probably not the tangents either). Here is what I have: // Transform vertex positions - Works like a charm! vertices = mesh.vertices; for (int i = 0; i < vertices.Length; ++i) vertices[i] = transform.MultiplyPoint(vertices[i]); // Does not work, lighting is messed up on mesh normals = mesh.normals; for (int i = 0; i < normals.Length; ++i) normals[i] = transform.MultiplyVector(normals[i]); Note: The input matrix converts from local to world space and is needed to combine multiple meshes together.

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• Dual Booting Windows 8 and Ubuntu 12.10 - thinkpad x230

  - by user110703

  I am having problems getting grub to load Windows 8 properly after installing Ubuntu 12.10 and Windows 8 on a solid state drive. Here's what I did: Fresh install of Windows 8 using USB recovery drive (partitioned SSD for UEFI) -- Tested windows install and it worked fine Built bootable USB with Ubuntu 12.10 64bit and installed Ubuntu -- Used Ubuntu's installer to partition the Windows 8 partition and install there Reboot - try to load windows 8 from grub -- Ubuntu loads correctly; windows load reports various problems with permissions and not being able to find files - I'll update what the actual errors are Tried to fix the boot problem using boot-repair: -- here's the output: http://paste.ubuntu.com/1384522/ So, this is my first time trying to setup a dual boot system and I think that UEFI is the main culprit in getting this to work correctly. What do I need to

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• Port 21 will not open. status is closed. forward port 21 to new domains.

  - by Bob Swaggerty

  I am having a problem opening port 21 on my Linux Ubuntu server. No matter what i do, i can not get my status to change from closed to open. Here is a recent iptables command i used and the result iptables -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT nmap -p21-22,25,80,443 CCR1 Starting Nmap 4.53 ( http://insecure.org ) at 2012-06-19 03:13 CDT Interesting ports on CCR1.chennaichristianradio.com (5.10.69.98): PORT STATE SERVICE 21/tcp closed ftp 22/tcp open ssh 25/tcp closed smtp 80/tcp open http 443/tcp closed https I also used commands from the advise from this forum http://www.cyberciti.biz/faq/iptables-open-ftp-port-21/ I need to open this for FTP access to the server, and ultimately I need to forward port 21 to 2 domains i am setting up. Thank you for any assistance you can provide -Bob Swaggerty

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• Trace code pascal [on hold]

  - by mghaffari

  I haven't worked with Pascal so far, and my problem is understanding the recursive aspects that prm assignment operators and how the final (correct) value is derived. Would someone please explain that line for me. Program test(output); FUNCTION prm(az:integer) : real; begin if az = 1 then prm := sqrt(12) else prm := sqrt(12*prm(az-1)); end; begin writeln(prm(30):0:2); end.

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• How to use a zenity progress bar with cclive

  - by Winael

  I tried to use a zenity progress bar with cclive. I'm writting a script to download web videos files and I wanna see the progression of the download. But when I try something like $cclive <url> 2>&1 | zenity --progress But when I execute the command line but it not seems to work. Any idea of how I can do that ? BR, [Edit] cclive have this kind of output : cclive http://www.youtube.com/watch?v=youtubevideo Checking ... .......... ..........done. youtubevideo.flv 2.5M 75.8K/s 00:09:29 5% So I need to send the last part to sdout but I dont know how. Else and about pulsate, we can't see th progression with this option, and I really need it... So I will not using pulsate for this script.

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• Configure audio on HP ENVY 4 ultrabook

  - by phodu_insaan

  I want to configure audio for ubuntu 12.04 on my laptop. Currently the audio just does not play. If i try and plug in headphones then somewhere midway to being fully plugged in the audio plays on the headphones, I plug in further and the sound disappears. How do I get this to work? lspci | grep audio Audio device: Intel Corporation Panther Point High Definition Audio Controller My laptop is one the beats edition HP laptops, and the driver for win7 was an IDT HD audio driver. --EDIT-- The output for cat /proc/asound/card0/codec* | grep Codec is Codec: IDT 92HD91BXX Codec: Intel PantherPoint HDMI I need to get both the IDT card to work and the HDMI card to work with my TV. --EDIT-- --EDIT 2-- I have added blacklist snd-usb-audio to the end of the file /etc/modprobe.d/alsa-base.conf Now the sound plays from my laptop speakers only when I plug in a headphones/external speaker. Otherwise no sound. :( Please help getting everything working as it should. --EDIT 2-- Thanks

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• Wiki based requirements engineering tool

  - by Shanon

  Hi, I'm looking to to build a wiki based tool the helps/aides in the requirements engineering process. More specifically I am hoping to end up with a tool that helps inexperienced users easily create and design requirements documents on a wiki platform. I was wondering if there exist any wiki/wiki platforms that either already exist or are easily extendible or would be worth looking at that for this purpose. For instance some of the features I was hoping to add would be to add structure to a document so that information is filled out in a standardised manner. Another idea I was looking at was to somehow create relationships between different types of documents (for example- a goal diagram gets evolves/ helps in the development of the class diagram). So far I have come across FOSwiki which claims to to fully customisalble...but I'm not sure what it means and what I can really do with that. Any input on FOSwiki is also highly appreciated.

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• Windows 8 client virtualization

  - by John Paul Cook

  Hyper-V is coming to Windows 8, but you must have a processor that supports SLAT. Virtual machines created with Virtual PC aren’t easily transferred to Windows 2008 Hyper-V and vice-versa. With Windows 8, it will be easy to move vhds from Windows 8 on your laptop or desktop to Windows 8 server and back again. To find out if your processor supports SLAT, run coreinfo –v from a command window running as administrator. Download coreinfo from here . My MacBook Pro supports SLAT as this output shows:...(read more)

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• Multi-Threaded Pipelined Game Engine Data Synchronization Questions

  - by Douglas

  Let's say I'm setting up a worker pool based game engine with pipelining. Let's say I have 4 stages in my pipeline as such: Stage 1: Physics Stage 2: AI/Input Stage 3: Game Logic Stage 4: Rendering Now let's say that the physics detects a collision between a bullet and a character in stage 1. Two frames later the game logic may choose to remove that bullet from the simulation, however none of the other copies of the data for the other pipeline stages will get this information. How is this sort of thing and other things like it get handled? Do you generally make changes like this to every pipeline stage's data at the end of a frame?

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• ubuntu 14 painfully slow on dell r200

  - by sirmonkey

  I didn't notice it at first. The machines (there is 20 plus) are to be used a simple file servers. It wasn't until samba just wouldn't act right that I installed a desktop gui and started more diagnoseing the problem did I catch the slow preformance... I've tested 4 servers they all suck. And windows 7 runs fantastic on them. I have Google and searched. But nothing to explain this. The easy test is dmesg is so slow you can almost read it. I'm guessing it's an apic or cpu power management issue. What output would you all like????? It is a core2 machine with 4Gb of ram. On board data.

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• Does 64-bit Ubuntu work on the Acer Aspire One D255

  - by hippietrail

  The Acer Aspire One D255 is the cheapest dual core netbook on the market right now. It has an Intel Atom N550 which should be able to run a 64-bit OS. But when I try to boot the Ubuntu 64-bit live CD I only get one line of diagnostic output that it "found something" on the USB CD drive before locking up. I haven't been able to find anything by Googling yet. Could it just be driver issues for this machine or could the platform be inherently frail for running 64-bit? (My machine is two days old on trial and Windows 7 and Ubuntu 32-bit run but it has locked up under casual use on both OSes.)

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• How can I convert .mp4 files to .3gp using ffmpeg?

  - by harisibrahimkv

  I would like to download a few videos from youtube and convert them to 3gp so that I can play them on my phone. I would like to know how this can be done using ffmpeg. I tried the various results on the net only to get the following errors. I used: ffmpeg -i dil.mp4 -sameq -ab 64k -ar 44100 dilenada.3gp I got: Unsupported codec for output stream #0.1 Seems stream 0 codec frame rate differs from container frame rate: 2000.00 (2000/1) - 29.92 (359/12) I used: ffmpeg -y -i dil.mp4 -r 20 -s 352x288 -b 400k -acodec libfaac -ac 1 -ar 2000 -ab 24k dilenada.3gp I got: Seems stream 0 codec frame rate differs from container frame rate: 2000.00 (2000/1) -> 29.92 (359/12) Unknown encoder 'libfaac' What am I doing wrong?

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• Ubuntu 11.10 is not detecting wired connection on Lenovo G580

  - by Dilip

  I am not able to see wired connection options in header menu. I can see wireless option but still It is not working. Could any one suggest what I am missing? Please find my ifconfig output: =================================== root@rails-dev:/home/rails_work/rdfnet# ifconfig lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:41944 errors:0 dropped:0 overruns:0 frame:0 TX packets:41944 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4602835 (4.6 MB) TX bytes:4602835 (4.6 MB) ===================================

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• Mount an external drive at boot time only if it is plugged in.

  - by Jeremy

  I've got an entry for an external harddrive in my fstab: UUID="680C0FE30C0FAAE0" /jgdata ntfs noatime,rw But sometimes this drive isn't plugged in at boot time. This leaves me half way through a boot, with a prompt to "Continue Waiting, press S or press M" but no keypress has any affect at this stage (including ctrl-alt-delete, not even caps-lock). Short of writing a script to check the output of fdisk -l, how can I mount this drive at boot time only if it is present? It would be handy to have an fdisk entry for this drive, so I can just type mount /jgdata instead of needing a device name.

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• creating object parameters in {}?

  - by RealityDysfunction

  I am trying to decode a piece of code from a book: List<Person> people = new List<Person>() { new Person {FirstName="Homer",LastName="Simpson",Age=47}, new Person {FirstName="Marge",LastName="Simpson",Age=45} }; Person is just a simple class they made, with a bunch of fields: Name, Last Name, etc... What I don't understand is, don't we send parameters to a constructor of Person in non-curly brackets? I tried replicating this code, but it doesn't seem to fly, any takers? Thanks for input.

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• How to grep 2 or 3 lines, one containing the text I want, and the others just below it?

  - by Kaustubh P

  This is a snapshot of error log: 06:16:29,933 ERROR EmailRMManager$:45 - Exception In get Message com.rabbitmq.client.AlreadyClosedException: clean connection shutdown; reason: Attempt to use closed channel at com.rabbitmq.client.impl.AMQChannel.ensureIsOpen(AMQChannel.java:195) at com.rabbitmq.client.impl.AMQChannel.rpc(AMQChannel.java:222) at com.rabbitmq.client.impl.AMQChannel.rpc(AMQChannel.java:208) at com.rabbitmq.client.impl.AMQChannel.exnWrappingRpc(AMQChannel.java:139) at com.rabbitmq.client.impl.ChannelN.basicGet(ChannelN.java:645) I do the following command: cat foo.log | grep ERROR to get an OP as: 06:16:29,933 ERROR EmailRMManager$:45 - Exception In get Message What command should I execute to get the output as 06:16:29,933 ERROR EmailRMManager$:45 - Exception In get Message com.rabbitmq.client.AlreadyClosedException: clean connection shutdown; reason: Attempt to use closed channel ie, also grep the line(s) after the pattern?

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• How to get distinct values from the List&lt;T&gt; with LINQ

  - by Vincent Maverick Durano

  Recently I was working with data from a generic List<T> and one of my objectives is to get the distinct values that is found in the List. Consider that we have this simple class that holds the following properties: public class Product { public string Make { get; set; } public string Model { get; set; } }   Now in the page code behind we will create a list of product by doing the following: private List<Product> GetProducts() { List<Product> products = new List<Product>(); Product p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy S 1"; products.Add(p); p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy S 2"; products.Add(p); p = new Product(); p.Make = "Samsung"; p.Model = "Galaxy Note"; products.Add(p); p = new Product(); p.Make = "Apple"; p.Model = "iPhone 4"; products.Add(p); p = new Product(); p.Make = "Apple"; p.Model = "iPhone 4s"; products.Add(p); p = new Product(); p.Make = "HTC"; p.Model = "Sensation"; products.Add(p); p = new Product(); p.Make = "HTC"; p.Model = "Desire"; products.Add(p); p = new Product(); p.Make = "Nokia"; p.Model = "Some Model"; products.Add(p); p = new Product(); p.Make = "Nokia"; p.Model = "Some Model"; products.Add(p); p = new Product(); p.Make = "Sony Ericsson"; p.Model = "800i"; products.Add(p); p = new Product(); p.Make = "Sony Ericsson"; p.Model = "800i"; products.Add(p); return products; }   And then let’s bind the products to the GridView. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Gridview1.DataSource = GetProducts(); Gridview1.DataBind(); } }   Running the code will display something like this in the page: Now what I want is to get the distinct row values from the list. So what I did is to use the LINQ Distinct operator and unfortunately it doesn't work. In order for it work is you must use the overload method of the Distinct operator for you to get the desired results. So I’ve added this IEqualityComparer<T> class to compare values: class ProductComparer : IEqualityComparer<Product> { public bool Equals(Product x, Product y) { if (Object.ReferenceEquals(x, y)) return true; if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null)) return false; return x.Make == y.Make && x.Model == y.Model; } public int GetHashCode(Product product) { if (Object.ReferenceEquals(product, null)) return 0; int hashProductName = product.Make == null ? 0 : product.Make.GetHashCode(); int hashProductCode = product.Model.GetHashCode(); return hashProductName ^ hashProductCode; } }   After that you can then bind the GridView like this: protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { Gridview1.DataSource = GetProducts().Distinct(new ProductComparer()); Gridview1.DataBind(); } }   Running the page will give you the desired output below: As you notice, it now eliminates the duplicate rows in the GridView. Now what if we only want to get the distinct values for a certain field. For example I want to get the distinct “Make” values such as Samsung, Apple, HTC, Nokia and Sony Ericsson and populate them to a DropDownList control for filtering purposes. I was hoping the the Distinct operator has an overload that can compare values based on the property value like (GetProducts().Distinct(o => o.PropertyToCompare). But unfortunately it doesn’t provide that overload so what I did as a workaround is to use the GroupBy,Select and First LINQ query operators to achieve what I want. Here’s the code to get the distinct values of a certain field. protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { DropDownList1.DataSource = GetProducts().GroupBy(o => o.Make).Select(o => o.First()); DropDownList1.DataTextField = "Make"; DropDownList1.DataValueField = "Model"; DropDownList1.DataBind(); } } Running the code will display the following output below:   That’s it! I hope someone find this post useful!

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• RPi and Java Embedded GPIO: Connecting LEDs

  - by hinkmond

  Next, we need some low-level peripherals to connect to the Raspberry Pi GPIO header. So, we'll do what's called a "Fry's Run" in Silicon Valley, which means we go shop at the local Fry's Electronics store for parts. In this case, we'll need some breadboard jumper wires (blue wires in photo), some LEDs, and some resistors (for the RPi GPIO, 150 ohms - 300 ohms would work for the 3.3V output of the GPIO ports). And, if you want to do other projects, you might as well by a breadboard, which is a development board with lots of holes in it. Ask a Fry's clerk for help. Or, better yet, ask the customer standing next to you in the electronics components aisle for help. (Might be faster) So, go to your local hobby electronics store, or go to Fry's if you have one close by, and come back here to the next blog post to see how to hook these parts up. Hinkmond

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• Eclipse not launching

  - by user274959

  I have installed Ubuntu 14.04, I have installed Eclipse using Ubuntu Software Center. But Eclipse is not opening, when I click it is not opening or showing any error message it is very silent. Output for java -version: java version "1.7.0_55" Java(TM) SE Runtime Environment (build 1.7.0_55-b13) Java HotSpot(TM) Server VM (build 24.55-b03, mixed mode) uname -a: Linux Lenovo-IdeaPad-Z510 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:08:14 UTC 2014 i686 i686 i686 GNU/Linux When I give Eclipse in terminal I am getting The program 'eclipse' is currently not installed. You can install it by typing: sudo apt-get install eclipse-platform And when I give sudo apt-get install eclipse-platform Reading package lists... Done Building dependency tree Reading state information... Done eclipse-platform is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

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