Search Results

Search found 12058 results on 483 pages for 'abstract syntax tree'.

Page 214/483 | < Previous Page | 210 211 212 213 214 215 216 217 218 219 220 221  | Next Page >

  • Building dynamic bounding box hierachies.

    - by adivasile
    I've been reading about collision detection and I saw that the first part was a coarse detection which generates possible contacts using bounding box hierarchies. I understand the concept of splitting up your objects in groups, to speed up the detection phase, but I'm a little confused on how do you actually build the hierachy, more so on what criteria is used to group them together. Do I iterate through all the objects in the scene, and check the distance between them to see where they should be inserted in the tree? Do you know some resources that may shed some light on this topic for me?

    Read the article

  • Unit testing a text index

    - by jplot
    Consider a text index such as a suffix tree or a suffix array supporting Count queries (number of occurrences of a pattern) and Locate queries (the positions of all the occurrences of a pattern) over a given text. How would you go about unit testing such a class ? What I have in mind is to generate a big random string then extract a random substring from this big string and compare the results of both queries with naive implementations (such as string::find). Another idea I have is to find the most frequent substring of length l appearing in the original string (using perhaps a naive method) and use these substrings for testing the index. This isn't the best way, so what would be a good design of the unit tests for a text index ? In case it matters, this is in C++ using google test.

    Read the article

  • Is it relevant to warn about truncating real constants to 32 bits?

    - by zneak
    I'm toying around with LLVM and looking at what it would take to make yet another strongly-typed language, and now that I'm around the syntax, I've noticed that it seems to be a pet peeve of strongly typed language to warn people that their constants won't fit inside a float: // both in Java and C# float foo = 3.2; // error: implicitly truncating a double into a float // or something along these lines Why doesn't this work in Java and C#? I know it's easy to add the f after the 3.2, but is it really doing anything useful? Must I really be that aware that I'm using single-precision reals instead of double-precision reals? Maybe I'm just missing something (which, basically, is why I'm asking). Note that float foo = [const] is not the same thing as float foo = [double variable], where requiring the cast seems normal to me.

    Read the article

  • Why does 'quickly package' fail with "An error has occurred when creating debian packaging"?

    - by slashcrack
    I've got a big problem with packing my quickly application for the Ubuntu App Showdown. When I try to package or submit my application, I get some warnings: quickly package ........ ---------------------------------- WARNING: syntax errors in facebook/FacebookWindow.py: encoding declaration in Unicode string (FacebookWindow.py, line 0) WARNING: the following files are not recognized by DistUtilsExtra.auto: AUTHORS~ facebook/AboutFacebookDialog.py~ facebook/FacebookWindow.py~ facebook/PreferencesFacebookDialog.py~ facebook/__init__.py~ facebook_lib/AboutDialog.py~ facebook_lib/Builder.py~ facebook_lib/PreferencesDialog.py~ facebook_lib/Window.py~ facebook_lib/__init__.py~ facebook_lib/facebookconfig.py~ facebook_lib/helpers.py~ setup.py~ ---------------------------------- An error has occurred when creating debian packaging ERROR: can't create or update ubuntu package ERROR: package command failed Aborting What does the second warning mean? How do I solve those warnings? I want to submit my app to the Ubuntu App developer Showdown into my PPA and it doesn't work. Thanks for any answer.

    Read the article

  • Not able to install nspluginwrapper on 64 bit Ubuntu 12.10

    - by user99305
    This is a brand new installation of 64 bit Ubuntu 12.10. I am not able to install nspluginwrapper. Here is the error message that I get: $ sudo apt-get install nspluginwrapper Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: nspluginwrapper : Depends: nspluginviewer (= 1.4.4-0ubuntu4) but it is not installable E: Unable to correct problems, you have held broken packages. I need nspluginwrapper to get Citrix receiver to work.

    Read the article

  • To use Dart, the Java programmer has to work with 2 languages? [closed]

    - by Sridhar-Sarnobat
    When deciding on a technology to use for web apps, it's become a difficult choice between GWT and Dart and I am looking for guidance in deciding. GWT is a java programmer's dream because they don't have to learn a new language or have to worry about a separate IDE or extra plugin etc. GWT was sold using this value proposition - one didn't need to program in Javascript. But are Google making a U-turn and saying "go through the hassle of learning a new language" afterall? Or is it intended for there to be a Java to Dart compiler so that Java developers do not have to learn a new language? (this is not a rant, so I don't know why you are down-voting the question) Note: "the syntax is very similar" is not a justification. You could say why bother with GWT and just work with Java + Javascript directly.

    Read the article

  • How to install g++ in Ubuntu 14.04?

    - by Apoorva sahay
    I have recently installed ubuntu 14.04 in virtual box. Now I want to install g++ 4.7 in it. I am trying this command in terminal but its not working. sudo apt-get install g++-4.7 Reading package list... Done Building dependency tree Reading state information... Done E: Unable to locate package g++-4.7 E: Couldn't find any package by regex 'g++-4.7' But I find gcc was there with Ubuntu 14.04 installation itself. How could I install g++ in ubuntu 14.04 and any version of g++ abouve 4.7.2 is fine with me.

    Read the article

  • What is the annoying/lacking feature in C#, in your opinion?

    - by Vimvq1987
    To be honest, I'm working with C# everyday, and I can say that I love its elegant syntax. But no language is perfect, so does C#. In my opinion, these two features are missing: Full-featured enum. I was pretty happy with enum in C#, until I know about enum in Java. Of course, we can "simulate" a full-featured enum in C# by class, but it's much better if Microsoft simplify this. Immutable keyword. We are told to let a class/struct immutable whenever possible. But to do that, we have to add readonly keyword to every field, and then if we add setter by a mistake, our class will be mutable, and nobody knows. By immutable keyword, every field will be automatically readonly, and any setter will be prohibited (error when compile). It's like static keyword added to class in C# 2.0 well. what's is your annoying/lacking feature in C#?

    Read the article

  • Simple script - execute command on selected file

    - by askmoo
    I want to make a script that will execute .jar file on selected file. Later I will add that script to right-click menu via the tool Nautilus Actions or just place it into nautilus-scripts folder. I have a problem creating script. When I am in a usual console screen and want to execute this jar file on any other file, I use this syntax myfile.jar ./someotherfile.xml and the jar file will write the output to the console screen. So I created a file script.sh, added lines in it #!/bin/bash /home/username/myfile.jar $1 But it does not output anything. I know I am doing something wrong. Please help. To sum, I need a script that will use selected file as a parameter, open the gnome-terminal, inside that terminal it will start JAR file and pass it the selected file. I am confident that this is a very simple procedure, but I am total newbie with shell scripting.

    Read the article

  • installing win7 x64 in VirtualBox - error driver device missing

    - by chrisjlee
    After creating a vhd and going through that process i'm unable to install win7 x64. I've went through various settings and trying to get it right. It'll boot the windows install but then indicate the following error (image included too): A required cd/dvd drive device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note if the windows installation media is in the CD/DVD drive, you can safely remove it for this step. I've also set up my storage tree like so: Would anyone know what the issue could be? It's asking for cd/dvd device drivers and i'm unable to install.

    Read the article

  • What is the good way of sharing specific data between ViewModels

    - by voroninp
    We have IAppContext which is injected into ViewModel. This service contains shared data: global filters and other application wide properties. But there are cases when data is very specific. For example one VM implements Master and the second one - Details of selected tree item. Thus DetailsVm must know about the selected item and its changes. We can store this information either in IAppContext or inside each concerned VM. In both cases update notifications are sent via Messenger. I see pros and cons for any of the approaches and can not decide which one is better. 1st: + explicitly exposed shared proerties, easy to follow dependencies - IAppContxt becomes cluttered with very specific data. 2nd: the exact opposite of the first and more memory load due to data duplication. May be someone can offer design alternatives or tell that one of the variants is objectively superior to the other cause I miss something important?

    Read the article

  • Why does everyone dislike PHP? [closed]

    - by SomeKittens
    I'm primarily a Java/Python programmer, but I just picked up an entry-level job doing web development. I had to learn PHP, and several of my CS friends told me that it would stunt my coding ability/be terrible to program in/murder me in the middle of the night. So far, there have been annoying moments with the language (one particular thing that bugs me is the syntax for calling functions...), but nothing living up to the statements of my friends. I still haven't learned very much about the language. Is their hate justified? Why or why not? A few quotes I've seen about PHP: Haskell is faster than C++, more concise than Perl, more regular than Python, more flexible than Ruby, more typeful than C#, more robust than Java, and has absolutely nothing in common with PHP. Audrey Tang "PHP is a minor evil perpetrated and created by incompetent amateurs, whereas Perl is a great and insidious evil, perpetrated by skilled but perverted professionals." Jon Ribbens. Programmer.

    Read the article

  • OO Software Architecture - base class that everything inherits from. Bad/good idea?

    - by ale
    I am reviewing a proposed OO software architecture that looks like this: Base Foo Something Bar SomethingElse Where Base is a static class. My immediate thought was that every object in any class will inherit all the methods in Base which would create a large object. Could this cause problems for a large system? The whole architecture is hierarchical.. the 'tree' is much bigger than this really. Does this sort of architecture have a name (hierarchical?!). What are the known pros and cons?

    Read the article

  • MacBook 5,1 - cant change brightness on 12.04

    - by RunnerUp
    I'm a total newbie to Ubuntu and recently decided to give it a go on my early 2009 Alu MacBook. For about a week now I've been trying to get the brightness controls to work. I've tried the following: Brightness controls doesn't work on a MacBook Pro 5.5 (ubuntu 12.04 LTS) https://help.ubuntu.com/community/MacBookPro5-5/Precise#LCD None of it seems to work. Next option was to try the Nvidia-bl-dkms drivers, but aftert installing the Mactel PPA I just get this: Reading package lists... DoneBuilding dependency tree Reading state information... Done E: Unable to locate package nvidia-bl-dkms Any help would be much appreciated as my eyes are going to fall out soon with the brightness maxed out.

    Read the article

  • How to access a Windows share from Ubuntu?

    - by Cyberscooty
    In Ubuntu 12.04 and previous versions, I can easily install smbfs and running smb://server/share from Nautilus works! But, in 12.10, I can't install smbfs. Trying to install it from the terminal, I see this that the package is obsolete: Reading package lists... Done Building dependency tree Reading state information... Done Package smbfs is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: cifs-utils E: Package 'smbfs' has no installation candidate How can access my Windows share easily in 12.10?

    Read the article

  • Wine dependencies

    - by user206923
    Hello I am new here and I have been trying to install wine: $ sudo apt-get install wine1.7 Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: wine1.7 : Depends: wine1.7-i386 (= 1.7.4-0ubuntu4) but it is not installable E: Unable to correct problems, you have held broken packages. what should i do ?

    Read the article

  • Virtual hosting

    - by H3llGhost
    Hello, I want to use domains like xxx.abc.domain.tld. The xxx is my folder to access. I tried it with the rewrite rules, but I can't get it working, because I don't know how to get the part xxx from the SERVER_NAME into my RewriteRule. This was my try: UseCanonicalName Off # include the IP address in the logs so they may be split LogFormat "%A %h %l %u %t \"%r\" %s %b" vcommon CustomLog /var/log/apache2/vaccess.log vcommon RewriteEngine On # a ServerName derived from a Host: header may be any case at all RewriteMap lowercase int:tolower ## deal with normal documents first: # do the magic RewriteCond ${lowercase:%{SERVER_NAME}} ^.+\.abc\.domain\.tld$ RewriteRule ^(.*)$ /var/www/abc.domain.tld/[xxx-part]/$1 [L] Perhaps there is a better solution. In generally I want to create a dynamic login system with mod_auth_mysql and for each xxx is a seperate user database. I would prefer the domain/address syntax abc.domain.tld/xxx, but I don't know how to realize it. Thanks for any advices.

    Read the article

  • Not able to create Live CD

    - by Jagannath Harati
    I downloaded 12.04.1 on a Windows 7 machine. I burnt a DVD from the ISO image using Windows Disc Image Burner. I had 'verify disc' on. The disc was created successfully with no errors. I was not able to use this disc for installing Ubuntu on another Windows 7 machine. I do not get the Welcome Screen on booting. I find that on the disc I burnt, I do not find bin, disc tree, programs directories and cdromupgrade, start.*, ubuntu* files. I found the boot directory and WUBI executable file. I tried downloading several times with the same result. I had similar problem earlier with 11.04. Can you please let me where the problem is?

    Read the article

  • Non-mathematical Project Euler (or similar)?

    - by Juha Untinen
    I checked the post (Where can I find programming puzzles and challenges?) where there's a lot of programming challenges and such, but after checking several of them, they all seem to be about algorithms and mathematics. Is there a similar site for purely logic/functionality-based challenges? For example: - Retrieve data using a web service - Generate output X from a CSV file - Protect this code against SQL injection - Make this code more secure - What is wrong with this code (where the error is in logic, not syntax) - Make this loop more efficient Does a challenge site like that exist? Especially one that provides hints and/or correct solutions. That would be a very helpful learning site.

    Read the article

  • How to get the Time Difference in C# .net

    - by Aamir Hasan
    A DateTime instance stores both date and time information. The DateTime class can be found in the System namespace.In order to retrieve the current system time, we can use the static property Now of the DateTime class.In this Example i have shown, how to calculate the difference between two DateTime objects using C# syntax. DateTime startTime; DateTime endTime;            startTime = Convert.ToDateTime("12:12 AM");            endTime = Convert.ToDateTime("1:12 AM");            var timeDifference = new TimeSpan(endTime.Ticks - startTime.Ticks);Response.Write("Time difference in hours is " + timeDifference.Hours);Link:http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx

    Read the article

  • I cannot log in after theme change

    - by sssuizaaa
    After changing the gtk-theme in the gnome tweak took I was taken out of the session to the login screen and now I cannot log in. I can only log in using the guest account. So in the grub menu I selected the recovery mode and in the resulting menu I selected root-drop to root shell prompt. Once there I did a couple of things I've found in several pages and in the forums. 1.gsettings reset org.gnome.desktop.interface gtk-theme This is what I got: (process:642):WARNING: Command line 'dbus-launch –autolunch=4438d024dd45ef7fb2d3f4ab0000000f –binary-syntax --close-stderr' exited with non-zero exit status 1: Autolaunch error: X11 initialization failed.\n and nothing changes 2.gconftool-2 --type=string -s /desktop/gnome/interface/gtk_theme Radiance with this I was trying to change the gtk theme to the Radiance one. No strange message this time but it did not work either. I still cannot log in. Any ideas please?? sssuizaaa

    Read the article

  • How selective do we need to be for an index to be used?

    - by TiborKaraszi
    You know the answer already: It depends. But I often see some percentage value quoted and the point of this post is to show that there is no such percentage value. To get the most out of this blog post, you should understand the basic structure for an index, i.e. how the b+ tree look like. You should also understand the difference between a clustered and a non-clustered index. In essence, you should be able to visualize these structures and searches through them as you read the text. If you find...(read more)

    Read the article

  • Creating a user called 'root'

    - by pnp
    I am creating Virtual Machines using the ubuntu-vm-builder. The syntax goes something like this: ubuntu-vm-builder kvm precise \ --domain newvm \ --dest newvm \ --arch i386 \ --hostname hostnameformyvm \ --mem 256 \ --user john \ --pass doe \ --ip 192.168.0.12 \ --mask 255.255.255.0 \ --net 192.168.0.0 \ --bcast 192.168.0.255 \ --gw 192.168.0.1 \ --dns 192.168.0.1 \ --mirror http://archive.localubuntumirror.net/ubuntu \ --components main,universe \ --addpkg acpid \ --addpkg vim \ --addpkg openssh-server \ --addpkg avahi-daemon \ --libvirt qemu:///system ; I need to enable the 'root' user account after creating each of my VMs (and supply a password for it). I was just wondering whether I can take this short-cut of supplying the username (--user) as root in this command itself. If I supply username as root to create my VMs, am I creating/enabling the root user, or just creating a user named as root? p.s.: any better ways to achieve my task are also welcome. But I don't want to manually meddle with each VM after its creation

    Read the article

  • SQL Concatenate

    - by Bunch
    Concatenating output from a SELECT statement is a pretty basic thing to do in SQL. The main ways to perform this would be to use either the CONCAT() function, the || operator or the + operator. It really all depends on which version of SQL you are using. The following examples use T-SQL (MS SQL Server 2005) so it uses the + operator but other SQL versions have similar syntax. If you wanted to join two fields together for a full name: SELECT (lname + ', ' + fname) AS Name FROM tblCustomers To add some static text to a value: SELECT (lname + ' - SS') AS Name FROM tblPlayers WHERE PlayerPosition = 6 Or to select some text and an integer together: SELECT (lname + cast(playerNumber as varchar) AS Name FORM tblPlayers Technorati Tags: SQL

    Read the article

  • How to speak to a computer

    - by SalemSeven
    I am a self taught.. NEW..programmer. The language I chose was Objective-C so I can write for Apple products. I have learned the hard way that Objective-C has a steep learning curve but have forced myself to look at it over and over until I get it. I feel I am completing one major step and that is becoming very comfortable with the syntax and now as I enter the next big step...finding out what is possible with a computer language - I am thinking that all software is just developed within the confines of classes-loops-booleans-IF/OR statements-variables-etc. Is that a true assessment? When thinking of software in my head do I just need to learn to convert it all to arrays-loops/variables/classes - IF/OR statements - etc? Sorry if this question sounds funny but I am just learning how to take the language in my head and talk (what I think is) the language of a computer. Is there a good book or tutorial that helps illustrate how to speak computer speak?

    Read the article

< Previous Page | 210 211 212 213 214 215 216 217 218 219 220 221  | Next Page >