Archives for March 2012 - Page 123

Make one monitor act like two, split in half

- by Nathan J. Brauer

Context: Ubuntu 11.10, Unity Let's say I have a screen at resolution 1000x500. What I'd like to do is split the screen down the middle so [Unity or X or ?] acts as if there are two displays (each of 500x500). Examples: Unity will display a different toolbar (the top one) on each side of the display. If I maximize a window on the left side of the screen, it will fill the left side only. If I maximize on the right, it will fill the right. If I hit "fullscreen" in youtube (flash) or Chrome or Movie Player, it will only fill the side of the display that it's on. If it's really is impossible to do this with Unity, will it work with Gnome3 and how? A million thanks!

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Laptop screen not detected but ubuntu working on other monitor

- by Aymane El Baamri

I have a laptop with with intel celeron inside 64 bit, the 64 bit amd ubuntu 11.10 is working on the laptop, just it wont detect the laptop screen but the same live usb worked on amd 64 pc, When i connected the desktop computer monitor to the laptop it worked perfectly with 1920x1080 screen, battery, WIFI. Im not sure if its cause i made the usb it with LiLo live usb creator on the desktop pc, should i remake the usb on the laptop?

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BCM4313 wireless not working on Dell Inspiron 4010

- by Mandar

I have Ubuntu 11.10 installed today and trying to connect to wireless but its not working. It has been working correctly on my Windows 7. i am pretty new to Ubuntu. I tried suggestions listed in this forum but nothing seems to be working for wireless. It shows wireless card listed when I do- sudo lshw -C network: It displays wireless interface as BCM4313. my laptop- Dell Inspiron 4010 Ubuntu- 11.10 Any suggestions? It works when I connect LAN cable to same modem.

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Unlock all private keys on Ubuntu, entering password only once at login

- by conradlee

I login to Ubuntu 12.04 using a password. Later on, when I use my browser(Chrome), I'm asked for a password to unlock the keychain so that the browser can access my saved credentials for various websites (it's the same password). Also, whenever I use SSH to connect to other computers using my private key, I am prompted for the same password to unlock my private key. How can I make it so that I am asked for my password exactly once per login (given that my login password is the same as the one I use for all my private keys)? Probably someone will try to label this question as a duplicate of this question, this question, or this question. While these questions are similar, none of them explicitly say that there still needs to be a password entered on login, as I am demanding here. As a result, the accepted solutions just say "set your passwords to blank"--I don't want that, it's dangerous! So I am aware of the similar questions, but none of them has received the correct answer yet, because they are slightly different.

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How do I do a B43 Legacy install on Ubuntu 11.10?

- by Gozzy

I recently installed ubuntu onto an extra hard drive and everything booted correctly. However, my Linksys wireless card is not working. I went though all the forums and walk throughs and I know that I need to install the b43 legacy firmware to get the card to work. When I try to install the files, I keep getting the message in Terminal saying "No such file or directory" for every file i need to run. It's Ubuntu 11.10 on a dell optiplex gx280. Also, the "pool" file that is supposed to be on the file system is not there

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Bluetooth problem, can't send any file. Access Denied (13)

- by Johny

well, i am new on ubuntu, and here is the first problem: I can't send any files to my phone by bluetooth, it just not connecting the devices. "Saying Access Denied (13)". Although both devices can see each other and they are even pared. What it can be? I'm using HTC Desire as a phone and Sony VAIO laptop with ubuntu 11.10, if it could help. Really don't know what to do and where can i configure my bluetooth setting.

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Ubuntu 11.10 Intel controller VGA detected but no signal

- by Fred Zimmerman

Ubuntu 11.10 Dell vostrum Intel® Sandybridge Mobile x86/MMX/SSE2 Displays ... correctly detects and identifies Viewsonic 27" VGA monitor, but monitor says it's receiving no signal Plugged into another monitor (Sony 20"), same result. $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) I've browsed these forums and tried everything that I can but nothing has worked. I need a stepwise troubleshooting plan.

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How to fix "Disk drive for /boot/efi is not ready or not present"?

- by N.N.

After I updated BIOS/UEFI version to 1101 on an Asus P8Z68-V PRO motherboard Ubuntu (11.10) did not boot. After POST all I saw was a black screen with a blinking cursor in the top left corner. I booted an Ubuntu 11.10 live-CD and set the flag for the 20 MB partition before my boot partition to "bios_grub". Then I was able to boot and login. But now every time I boot and Ubuntu loads I get the following message: Disk drive for /boot/efi is not ready or not present. Continue waiting or press s to skip or m for manual recovery. I am able to login if I choose to ignore it by pressing s, but what does this message mean? How can I fix what the message warns about? After logging in I have noticed that /boot/efi is empty. The following forum post speaks of the same issue ubuntuforums.org/showthread.php?t=1893030. Updating to the latest BIOS/UEFI - version 3203, did not have any effect on this issue.

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What are the common pitfalls that would stop Authorised Key SSH access, and how do I find and correct for them?

- by Ashimema

EDIT: This question was reworked to make it more useful to the community and less specific to me. Questions seem to come up reasonably often regarding ssh and problems with authorised keys access, but very few seem to have a clear answer anywhere; Server keeps asking for password after I've copied my SSH Public Key to authorized_keys ssh not accepting public key how do I use ssh with key access in 11.10 passwordless ssh not working So, In the communities opinion, what is the tried and tested method for getting to the bottom of such problems?

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chrome download interrupted leaving ".crdownload" temporary file

- by Tim

I am using Google Chrome 15.0.874.121 in Ubuntu 10.10. It was fine until recently. Whenever download a file, it always reports "Interrupted", but it actually finishes the downloading, leaving an intermediate file with extension ".crdownload". If removed the extension, the file will be perfect. Note that downloading in Firefox works fine at the same time. So I wonder if it is a bug or how I can fix it? Thanks and regards!

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How do I get my Broadcom BCM4313 working correctly?

- by Ataraxio Panzetta

I've installed ubuntu on a Asus 1015 netbook. Everything worked out of the box except for the Wireless adapter, which i had to install with the Additional Drivers application. It apparently installed fine and connects to our wireless network, but it only works at a "funny" speed range that goes from 367Bytes to a peak of 3Kb in its best moments. I know for sure the problem is neither the network nor the hardware. Network speeds are normal under windows on this laptop and in other computers with ubuntu aswell. lspci says the card is a BCM4313 model, but the Addittional Drivers Manager says these packecege contains Broadcom 802.11 Linux STA wireless driverfor use with Broadcom's BCM4311-, BCM4312-, BCM4321-, and BCM4322 based hardware seems like it installed the wrong driver... Is there anything I can do? I'm not concerned about compiling the driver or stuff like that, but I'm not sure on where to start... any help or guidance will be very, very appreciated.

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Remapping Alt + F2 in Unity

- by Jesse

I disabled the Alt + F2 default shortcut in unity (ubuntu 11.10) using ccsm and I set a new shortcut using the default system shortcut manager (system settings keyboard). And it works, until I execute a command like compiz --replace. After that, all shortcuts keep working normally, except for Alt + F2. It does nothing. Any suggetions to keep the custom Alt + F2 shortcut working after compiz --replace?

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How can I prevent my site from being branded a "content farm?"

- by Fredashay

I'm building a small social Q&A site. Another Q&A site that I use was recently branded by Google as a content farm and removed from Google results. I know what Wikipedia says is the definition of a content farm (low quality paid articles and spammy text across the page to catch search engines). That other site I use doesn't do those things, so there must be more to it than that. I want to make sure I don't do anything that causes Google to think my Q&A site is a content farm. What should I do, or avoid doing in designing my site layout?

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How to prevent Google from finding my admin index page?

- by krish

I am running a website but for some days i stopped it and put the under-construction page because the Index of admin page is visible to the outside world through the Google search. One of my friend told me that your websites index is visible and its one step away to access the password file and he shows me that very simply using the Google search. How can i prevent this and i am hosting my site with a hosting company and i report about this to them but they simply replied to me still its secure so you no need to worry... am i really don need to worry and continue my site with the visible index of admin page?

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Website falsely blocked because of spam. Does anyone know how we should proceed?

- by Thomas Crepain

I'm responsible for ICT at FOS Open Scouting, a belgian scouting organisation. Our website was hacked a few years back and blocked by Facebook as a result. After we regained control over the site Facebook continued to block our domain and this is causing us a number of problems. We have tried many times in the past year to contact Facebook using their 'I am blocked from adding content' form (https://www.facebook.com/help/contact.php?show_form=block_appeal) to no avail. The blocked URLs are: http://www.fos.be and http://www.fosopenscouting.be Does anyone know how we should/could proceed?

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Non-public site for testing on shared-hosting site

- by ptpaterson

Is it possible to as a developer using a shared hosting site such as bluehost, hostgator, and the like, to view your site without making it public. Or do the files you upload always go live immediately? Is the best way to test a site (if using shared hosting) to just set up some apache/mysql/php service on my machine? I am considering putting together a site with shared hosting, and trying to see what all my options are. Thanks.

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simple collision detection

- by Rob

Imagine 2 squares sitting side by side, both level with the ground: http://img19.imageshack.us/img19/8085/sqaures2.jpg A simple way to detect if one is hitting the other is to compare the location of each side. They are touching if ALL of the following are NOT true: The right square's left side is to the right of the left square's right side. The right square's right side is to the left of the left square's left side. The right square's bottom side is above the left square's top side. The right square's top side is below the left square's bottom side. If any of those are true, the squares are not touching. If all of those are false, the squares are touching. But consider a case like this, where one square is at a 45 degree angle: http://img189.imageshack.us/img189/4236/squaresb.jpg Is there an equally simple way to determine if those squares are touching?

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how to create 2D collision detection

- by Aidan Mueller

I would like to know the best or most effective way to test for 2D collision. I also can do AABBs but when you have a line, for example, that is rotated 45º, and it is really long. it will be hitting things when it shouldn't. I might be able to go through the pixels to see if they are touching others, but that might be slow if I had a big picture. and it might add some complications if I had a movie clip made of several images. How do I check collision between two Images? How would I do circle to box? Please help : ) PS: I do know java so you can write with java syntax and then use a made up GL

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Super-quick MIDI generator with nonrestrictive license?

- by Ricket

I'm working on my Ludum Dare entry and trying to figure out how in the world I'm ever going to get background music. I found WolframTones, but the license is too restrictive: Unless otherwise specified, this Site and content presented on this Site are for your personal and noncommercial use. You may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any information or content obtained from this Site. For commercial and other uses, contact us. But I really like the interface! It's a lot like sfxr - click a genre and download a song. That's so cool. Is there another program that does this same sort of thing but without a restrictive license, so that I can generate a bgm and use it in my game?

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problems texture mapping in modern OpenGL 3.3 using GLSL #version 150

- by RubyKing

Hi all I'm trying to do texture mapping using Modern OpenGL and GLSL 150. The problem is the texture shows but has this weird flicker I can show a video here http://www.youtube.com/watch?v=xbzw_LMxlHw and I have everything setup best I can have my texcords in my vertex array sent up to opengl I have my fragment color set to the texture values and texel values I have my vertex sending the textures cords to texture cordinates to be used in the fragment shader I have my ins and outs setup and I still don't know what I'm missing that could be causing that flicker. here is my code FRAGMENT SHADER #version 150 uniform sampler2D texture; in vec2 texture_coord; varying vec3 texture_coordinate; void main(void){ gl_FragColor = texture(texture, texture_coord); } VERTEX SHADER #version 150 in vec4 position; out vec2 texture_coordinate; out vec2 texture_coord; uniform vec3 translations; void main() { texture_coord = (texture_coordinate); gl_Position = vec4(position.xyz + translations.xyz, 1.0); } Last bit here is my vertex array with texture cordinates GLfloat vVerts[] = { 0.5f, 0.5f, 0.0f, 0.0f, 1.0f , 0.0f, 0.5f, 0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.5f, 0.0f, 0.0f, 1.0f, 0.0f}; //tex x and y HERE IS THE ACTUAL FULL SOURCE CODE if you need to see all the code in its fullest glory here is a link to every file http://ideone.com/7kQN3 thank you for your help

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Velocity control of the player, why doesn't this work?

- by Dominic Grenier

I have the following code inside a while True loop: if abs(playerx) < MAXSPEED: if moveLeft: playerx -= 1 if moveRight: playerx += 1 if abs(playery) < MAXSPEED: if moveDown: playery += 1 if moveUp: playery -= 1 if moveLeft == False and abs(playerx) > 0: playerx += 1 if moveRight == False and abs(playerx) > 0: playerx -= 1 if moveUp == False and abs(playery) > 0: playery += 1 if moveDown == False and abs(playery) > 0: playery -= 1 player.x += playerx player.y += playery if player.left < 0 or player.right > 1000: player.x -= playerx if player.top < 0 or player.bottom > 600: player.y -= playery The intended result is that while an arrow key is pressed, playerx or playery increments by one at every iteration until it reaches MAXSPEED and stays at MAXSPEED. And that when the player stops pressing that arrow key, his speed decreases until it reaches 0. To me, this code explicitly says that... But what actually happens is that playerx or playery keeps incrementing regardless of MAXSPEED and continues moving even after the player stops pressing the arrow key. I keep rereading but I'm completely baffled by this weird behavior. Any insights? Thanks.

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C# WinForms. Multiple Forms in separate threads

- by Calum Murray

I'm trying to run an ATM Simulation in C# with Windows Forms that can have more than one instance of an ATM machine transacting with a bank account simultaneously. The idea is to use semaphores/locking to block critical code that may lead to race conditions. My question is this: How can I run two Forms simultaneously on separate threads? In particular, how does all of this fit in with the Application.Run() that's already there? Here's my main class: public class Bank { private Account[] ac = new Account[3]; private ATM atm; public Bank() { ac[0] = new Account(300, 1111, 111111); ac[1] = new Account(750, 2222, 222222); ac[2] = new Account(3000, 3333, 333333); Application.Run(new ATM(ac)); } static void Main(string[] args) { new Bank(); } } ...that I want to run two of these forms on separate threads... public partial class ATM : Form { //local reference to the array of accounts private Account[] ac; //this is a reference to the account that is being used private Account activeAccount = null; private static int stepCount = 0; private string buffer = ""; // the ATM constructor takes an array of account objects as a reference public ATM(Account[] ac) { InitializeComponent(); //Sets up Form ATM GUI in ATM.Designer.cs this.ac = ac; } ... I've tried using Thread ATM2 = new Thread(new ThreadStart(/*What goes in here?*/)); But what method do I put in the ThreadStart constructor, since the ATM form is event-driven and there's no one method controlling it? Thanks, Calum

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channel factory null on debug?

- by Garrith

When I try to invoke a GetData contract using wcf rest in wcf test client mode I get this message: The Address property on ChannelFactory.Endpoint was null. The ChannelFactory's Endpoint must have a valid Address specified. at System.ServiceModel.ChannelFactory.CreateEndpointAddress(ServiceEndpoint endpoint) at System.ServiceModel.ChannelFactory`1.CreateChannel() at System.ServiceModel.ClientBase`1.CreateChannel() at System.ServiceModel.ClientBase`1.CreateChannelInternal() at System.ServiceModel.ClientBase`1.get_Channel() at Service1Client.GetData(String value) This is the config file for the host: <system.serviceModel> <services> <service name="WcfService1.Service1" behaviorConfiguration="WcfService1.Service1Behavior">  <endpoint address="http://localhost:26535/Service1.svc" binding="webHttpBinding" contract="WcfService1.IService1" behaviorConfiguration="webHttp" >  <identity> <dns value="localhost"/> </identity> </endpoint> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="WcfService1.Service1Behavior">  <serviceMetadata httpGetEnabled="true"/>  <serviceDebug includeExceptionDetailInFaults="false"/> </behavior> </serviceBehaviors> <endpointBehaviors> <behavior name="webHttp"> <webHttp/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> </configuration> Code: [ServiceContract(Namespace = "")] public interface IService1 { //[WebInvoke(Method = "POST", UriTemplate = "Data?value={value}")] [OperationContract] [WebGet(UriTemplate = "/{value}")] string GetData(string value); [OperationContract] CompositeType GetDataUsingDataContract(CompositeType composite); // TODO: Add your service operations here } public class Service1 : IService1 { public string GetData(string value) { return string.Format("You entered: {0}", value); }

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Comparing two select elements values

- by user1135192

I've been been trying to look for a piece of javascript code that compares the values selected by a user in a html form from two <select> tags. So if the user selects a minimum value that is greater than the maximum number an alert box in javascript should be displayed. For example, if the user selects 5 bedrooms from the the MINIMUM bedrooms dropdown list and then 3 bedrooms from the MAXIMUM bedrooms dropdown list, this should not allow the form to be processed when the submit button is clicked. But is fine when 3 is selected from the MINIMUM dropdown list and 5 from the MAXIMUM dropdown list. <form name="search" action="page3.php" method="GET"> <select name="minimumBeds"> <option value="1"> 1 </option> <option value="2"> 2 </option> <option value="3"> 3 </option> <option value="4"> 4 </option> <option value="5"> 5 </option> </select> <select name="maximumBeds"> <option value="1"> 1 </option> <option value="2"> 2 </option> <option value="3"> 3 </option> <option value="4"> 4 </option> <option value="5"> 5 </option> </select> </form>

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Efficient Multiplication of Varying-Length #s [Conceptual]

- by Milan Patel

Write the pseudocode of an algorithm that takes in two arbitrary length numbers (provided as strings), and computes the product of these numbers. Use an efficient procedure for multiplication of large numbers of arbitrary length. Analyze the efficiency of your algorithm. I decided to take the (semi) easy way out and use the Russian Peasant Algorithm. It works like this: a * b = a/2 * 2b if a is even a * b = (a-1)/2 * 2b + a if a is odd My pseudocode is: rpa(x, y){ if x is 1 return y if x is even return rpa(x/2, 2y) if x is odd return rpa((x-1)/2, 2y) + y } I have 3 questions: Is this efficient for arbitrary length numbers? I implemented it in C and tried varying length numbers. The run-time in was near-instant in all cases so it's hard to tell empirically... Can I apply the Master's Theorem to understand the complexity...? a = # subproblems in recursion = 1 (max 1 recursive call across all states) n / b = size of each subproblem = n / 1 - b = 1 (problem doesn't change size...?) f(n^d) = work done outside recursive calls = 1 - d = 0 (the addition when a is odd) a = 1, b^d = 1, a = b^d - complexity is in n^d*log(n) = log(n) this makes sense logically since we are halving the problem at each step, right? What might my professor mean by providing arbitrary length numbers "as strings". Why do that? Many thanks in advance

Monthly Archives

Articles indexed in March 2012

Page 123/239 | < Previous Page | 119 120 121 122 123 124 125 126 127 128 129 130 | Next Page >

- by Nathan J. Brauer

- by Aymane El Baamri

- by Mandar

- by conradlee

- by Gozzy

- by Johny

- by Fred Zimmerman

- by N.N.

- by Ashimema

- by Tim

- by Ataraxio Panzetta

- by Jesse

- by Fredashay

- by krish

- by Thomas Crepain

- by ptpaterson

- by Rob

- by Aidan Mueller

- by Ricket

- by RubyKing

- by Dominic Grenier

- by Calum Murray

- by Garrith

- by user1135192

- by Milan Patel

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