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• bluetooth daemon not running at startup

  - by ffaxer

  I'm trying to connect a bluetooth mouse to my Xubuntu system using Blueman (v. 1.21) Problem seems to be bluetoothd not running at startup, so blueman refuses to start, only a dialog appears: "Bluez daemon is not running, blueman-manager cannot continue." On my system, bluetoothd will run only as root (sudo), so my current workaround is simply to sudo bluetoothd manually, which works fine but id like to have it run at startup so that my mouse is just working without any interaction from me, if possible. If i try to start bluetoothd as non-root it reports: Bluetooth deamon 4.91 Unable to get on D-Bus In the startup scripts i found the same bluetoothd script in all runlevels and init.d: DAEMON=/usr/sbin/bluetoothd test -f /usr/sbin/bluetoothd || exit 0 # bluetoothd normally starts up by udev rules. it needs dbus to function, log_progress_msg "bluetoothd" pkill -TERM bluetoothd || true log_progress_msg "bluetoothd" I looked in /etc/udev/rules.d/ but no reference to bluetoothd. Further i have already tried with no luck: Editing /etc/dbus-1/system.d/bluetooth.conf to include my user (essentially copying the part that was for root): I tried it while both keeping the root policy and without, still, no luck! Editing /etc/pam.d/common-session and /etc/pam.d/gdm to include the line: session optional pam_ck_connector.so In the case of common-session it was already there but with a "nox11" which i tried removing. No luck no luck. Btw, I'm confused as to which session manager I'm using, since i have both xfce4-session and gdm-session-worker running. Anyways, hope someone is savvy enough to figure it out or bring some hints, otherwise i sincerely apologize for wasting your time! I'll sign off with uname -a: Linux [mycompname] 3.0.0-9-lowlatency #12ppa1~natty1-Ubuntu SMP PREEMPT Mon Aug 22 06:52:15 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Peace B)

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• Breadcrumbs in a modern web application, make sense? [on hold]

  - by Xtreme Biker

  I'm currently beginning with the development of a new web application. The whole web application is going to be bookmarkable and all the pages accesible via GET requests and url parameters. Having said that, let's suppose I've got three entities in my application, Customer, Team and City. Each Customer and Team belong to a city and I've got a city-detail page which displays the detail for a concrete city. So next navigation cases are possible: Customers - Customer detail (id=2) - City detail (id=3) Football teams - Team detail (id=5) - City detail (id=3) Cities - City detail (id=3) There are three possible ways of ending up in a city detail view. My question is, does it make sense to implement a breadcrumb to show such a history, having it available in the browser itself? Would it be more appropiate to show a breadcrumb with the last case, no matter where we're coming from (hierarchical breadcrumb)? That's what Jakob Nielsen points out here: Offering users a Hansel-and-Gretel-style history trail is basically useless, because it simply duplicates functionality offered by the Back button, which is the Web’s second-most-used feature. A history trail can also be confusing: users often wander in circles or go to the wrong site sections. Having each point in a confused progression at the top of the current page doesn’t offer much help. Finally, a history trail is useless for users who arrive directly at a page deep within the site. Also, even if the history trail seems the most natural way to implement it, it requires an extra effort to keep the whole track being HTTP a stateless mean.

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• Why is NDA so hard to understand?

  - by Dave Campbell

  Maybe this concept is simpler for me because of all the jobs I've been on over the years requiring security clearances. I've signed quite a few NDA forms. Some for big companies, some for small, but the meaning of "NDA" remains constant: Non-Disclosure Agreement. To me, that takes no further explanation, but apparently it's confusing to some people, and I don't understand how you can be confused. The papers I signed with the U.S. Army in 1970 read "10 years and $10,000" for a violation... can't imagine what it's up to now, but THAT is a strict NDA :) So those things I've been told, I cannot talk about, period. Even if the entire world knows about them, I cannot speak about them until the information goes off NDA. An example was a Silverlight release a while back. It might have been Silverlight 3, I don't remember. Everyone was anxiously awaiting the release so they could post their material. Of course the entire world knew it was coming out and imminently so. Some enterprising folks had even found the bits on a server before the official announcement. So then the situation became: everyone knew about it, some were even coding with it and blogging about it and yet we couldn't talk about it. Scott Guthrie's posting about it opened the flood gates and then it went off NDA, but up until that moment, we were locked. Sitting out on the edge you're uninstalling and re-installing all the time and you get frustrated when things that used to work don't, but hey... those bits were still warm when you got 'em, and that's the fun. But that fun comes at a price, and the price is the NDA. Awkward yes, confusing no... See you at MIX10, and Stay in the 'Light! MIX10

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• How to connect Ethernet on Ubuntu (with auto-detection)

  - by user12285

  It's been well over six months but I have the same router SmartAX MT880d with Ethernet, and the exact same problem : no internet, even though I can successfully reach the modem settings page by entering 192.168.1.1 in Firefox. I'm a total beginner with Ubuntu. My internet works great in Windows but does not work in Ubuntu. Sorry if I don't use the right (technical) terminology to explain my issue. English is not my mother tongue. For 2 weeks, I've been doing reading on the web and forums and the ubuntuguide.org to name a few, but to no avail. Now I see no other solution but to ask for help. My problem is that I can't find a way to put the right digits in the right place because I don't know what numbers I need to put in what files. E.g.: do I need to use DHCP? or a static IP address? No clue whatsoever. I'm concerned that I might put figures in the wrong spaces. For example, is the modem/router's IP exactly 192.168.1.1 for Huawei Smart AXMT880d modem? Is the subnet 255.255.255.0? Gateway 192.168.1.1? I'm confused as I can also see a different IP starting with 155131*** (is it an account number?) on my contract with Huawei (a Chinese ISP). Apart from calling 911, what other numbers do I need to put in and where? How do I check that all the numbers have been entered correctly in every appropriate space before trying to connect the Internet?

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• ERP/CRM Systems. Desktop Based ? Web based?

  - by Parhs

  Hello guys... I have seen 2-3 ERPs in action. I am wondering what is better. Desktop based application or webbased displayed on a browser. My first expirience was with a web based ERP when i was 14 years old.. It was web based and terribly slow... For most simple task you had to do lots of clicks... no keyboard support ..... Pages took ages to load. Last year i worked for migrating to a newer computer some old terminal based cobol application. The computer that worked till today and still has no problem was from 1993. The user interface ofcourse was textbased.. The speed that guys placed orders was amazing! just typing the name of the customer , then 5-10 keys to add a product to order.... Comparing to this ERP the page for placing orders Link (click sales orders) seems terribly slow to add a product... No keyboard shortcut works to save what you added and generally i believe you need 4 times more time to place an order compared to the text interface... Having to use both mouse and keyboard for this task is BAD and sadistic... So how can tek heck these people ever use a system like that ??? So in the long run desktop application seems the only way... Ofcourse browsers support shortcuts but the way to overide the defaults that browsers uses isnt cross compatible... That is a hudge problem. Finnaly, if we MUST/forced use cloud in near future what about keyboard shortcuts?? I feel confused... I have seen converters of desktop applications to browser applications but are SLOW as hell... The question is what about user friendliness?What kind of application would you use?

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• How is"cloud computing"different from "client-server"?

  - by BellevueBob

  Watching a CEO for a new "cloud computing" company describe his company on a finance TV program today, he said something like "Cloud computing is superior to old-fashioned client-server computing". Now I'm confused. Can someone please explain what "cloud computing" means in contrast to client-server? As far as I understand it, cloud computing is more of a network services model, such that I do not own or maintain the physical hardware. The "cloud" is all the back-end stuff. But I still might have an application that communicates with that "cloud" environment. And if I run a web site presents a form that a user fills out, pushes a button on the page, and returns some report that was generated by the web server, isn't that the same as "cloud" computing? And would you not consider my web browser as the "client"? Please note my question is specific to the concept of "cloud computing" with respect to "client-server". Sorry if this is an inappropriate question for this site; it's the one closest in the Stack universe and this is my first time here. I'm an old timer, programming since mainframe days in the late 70's.

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• Unity does not load when selecting Xorg open source radeon driver

  - by Teddy Thorpe

  When I select the X.org Radeon open source driver, Unity does not load. However, when I select the Proprietary AMD Driver from the official Ubuntu repository, Unity does load. Why is Unity doing this? I had no problems with switching between these drivers in Ubuntu 12.04 LTS. This started happening when I upgraded to Ubuntu 12.10. Before I ever installed the propriatery AMD driver, the X.org driver loaded Unity fine, but very sluggishly. I downloaded the AMD driver from their official website and installed that first and that is what started this problem. I removed that driver and went back to X.org and X.org didn't load Unity either. Then using Synaptic, I installed the AMD driver from the Ubuntu repositories and thats what I'm using now. I'm very confused why that downloaded AMD driver would effect X.org. I have a AMD Radeon HD 6620G. It's integrated graphics on my AMD A8-3500M APU (Accelerated Processing Unit as AMD advertises it).

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• Usage of repository between EF model and code consumer

  - by jim

  I have binary data in my database that I'll have to convert to bitmap at some point. I was thinking whether or not it's appropriate to use a repository and do it there. My consumer, which is a presentation layer, will use this repository. For example: // This is a class I created for modeling the item as is. public class RealItem { public string Name { get; set; } public Bitmap Image { get; set; } } public abstract class BaseRepository { //using Unity (http://unity.codeplex.com) to inject the dependancy of entity context. [Dependency] public Context { get; set; } } public calss ItemRepository : BaseRepository { public List<Items> Select() { IEnumerable<Items> items = from item in Context.Items select item; List<RealItem> lst = new List<RealItem>(); foreach(itm in items) { MemoryStream stream = new MemoryStream(itm.Image); Bitmap image = (Bitmap)Image.FromStream(stream); RealItem ritem = new RealItem{ Name=item.Name, Image=image }; lst.Add(ritem); } return lst; } } Is this a correct way to use the repository pattern? I'm learning this pattern and I've seen a lot of examples online that are using a repository but when I looked at their source code... for example: public IQueryable<object> Select { return from q in base.Context select q; } as you can see no behavior is added to the system by their approach, so I was confused that maybe repository is something else and I got it all wrong. At the end there should be extra benifits of using them right?

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• using Moniker.com's nameservers

  - by user7519

  I have a VPS with A2Hosting for which i need to upgrade the OS. However, they've changed their VPS packages and forced me to order a new one. I went with an "unmanaged" package and have only just realised that they do not provide any DNS service at all, not even nameservers. Support tells me that "since your domain is not hosted with us, but with Moniker, you would not be able to use these nameservers. Your domain registrar should have a set of default nameservers that you can use, then create a A record to point to" my IP address. Moniker does provide for using their nameservers but i'm confused about which "pre-defined zone configuration" to use. They are: Domain Parking Domain Parking with Email Forwarding URL and Email Forwarding URL Forwarding URL Forwarding & CoolHandle Email I just want to use their nameserver and then create A & MX records pointing to the VPS. What do they mean by forwarding? I get the feeling it's a service that i don't want. Or, is it that i need to have a pre-defined zone only temporarily, and THEN set the A & MX? Which of these should i choose.

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• vector rotations for branches of a 3d tree

  - by freefallr

  I'm attempting to create a 3d tree procedurally. I'm hoping that someone can check my vector rotation maths, as I'm a bit confused. I'm using an l-system (a recursive algorithm for generating branches). The trunk of the tree is the root node. It's orientation is aligned to the y axis. In the next iteration of the tree (e.g. the first branches), I might create a branch that is oriented say by +10 degrees in the X axis and a similar amount in the Z axis, relative to the trunk. I know that I should keep a rotation matrix at each branch, so that it can be applied to child branches, along with any modifications to the child branch. My questions then: for the trunk, the rotation matrix - is that just the identity matrix * initial orientation vector ? for the first branch (and subsequent branches) - I'll "inherit" the rotation matrix of the parent branch, and apply x and z rotations to that also. e.g. using glm::normalize; using glm::rotateX; using glm::vec4; using glm::mat4; using glm::rotate; vec4 vYAxis = vec4(0.0f, 1.0f, 0.0f, 0.0f); vec4 vInitial = normalize( rotateX( vYAxis, 10.0f ) ); mat4 mRotation = mat4(1.0); // trunk rotation matrix = identity * initial orientation vector mRotation *= vInitial; // first branch = parent rotation matrix * this branches rotations mRotation *= rotate( 10.0f, 1.0f, 0.0f, 0.0f ); // x rotation mRotation *= rotate( 10.0f, 0.0f, 0.0f, 1.0f ); // z rotation Are my maths and approach correct, or am I completely wrong? Finally, I'm using the glm library with OpenGL / C++ for this. Is the order of x rotation and z rotation important?

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• Ray Tracing concers: Efficient Data Structure and Photon Mapping

  - by Grieverheart

  I'm trying to build a simple ray tracer for specific target scenes. An example of such scene can be seen below. I'm concerned as to what accelerating data structure would be most efficient in this case since all objects are touching but on the other hand, the scene is uniform. The objects in my ray tracer are stored as a collection of triangles, thus I also have access to individual triangles. Also, when trying to find the bounding box of the scene, how should infinite planes be handled? Should one instead use the viewing frustum to calculate the bounding box? A few other questions I have are about photon mapping. I've read the original paper by Jensen and many more material. In the compact data structure for the photon they introduce, they store photon power as 4 chars, which from my understanding is 3 chars for color and 1 for flux. But I don't understand how 1 char is enough to store a flux of the order of 1/n, where n is the number of photons (I'm also a bit confused about flux vs power). The other question about photon mapping is, if it would be more efficient in my case to store photons per object (or even per Object's triangle) instead of using a balanced kd-tree. Also, same question about bounding box of the scene but for photon mapping. How should one find a bounding box from the pov of the light when infinite planes are involved?

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• Accessing a Web Service: Learning Resource needed

  - by abel

  I have been searching for resources to learn (Java) Web Services. Although I have found a lot of resources and tutorials on JWS, I am confused with the version numbers, the abbreviations and Metro. Plus the last update to Metro was in 2008. Is it a worthwile thing to learn? I wanted to learn how to access Web Services, since an upcoming project is about accessing one. I have some experience with OAuth on Twitter(using code available). Things I know about the project: I have to access a Web Service. Java is the preferred platform to use(Although I know I can use any). Axis can be used to access the Web Service(I have never used Axis) I have a meeting scheduled to learn more, but I sure don't want to look silly since I am no Java expert, have never created or accessed Web Services using Java. My Questions: 1.Can someone point me to a tutorial which will help me learn how to access a already running Web Service (Preferably SOAP(?), not REST. It's XML based) 2. Will you recommend using PHP or Python to do the work of accessing the web service? I am expecting a lot of nay saying, but I hope I get some answers too. I will clarify things if needed.

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• Starting to Program C++ and Java

  - by user0321

  So as the title states, I'm trying to start programming in C++ and Java. I took C++ and Java courses in high school and I'm trying to get back into it. Of course all I want to get working now is a simple "Hello World" program. Couple of things: I want to use an IDE. I've decided on Eclipse. I'm just confused about how I go about downloading/using it. For Java: I get stuck right on their download page. They show Eclipse Classic, Eclipse IDE for Java developers and Eclipse IDE for Java EE Developers. I only programmed in Notepad and compiled in command prompt. Question 1: Which version of Eclipse should I download? Question 2: Do I need to install the Java JDK or does it come built into Eclipse? For C++: I guess I download the separate Eclipse IDE for C/C++ developers? I'm not too sure. I remember using Microsoft Visual for C++. I remember it being weird though. Anyways Question 3: Which version of Eclipse should I download? Question 4: Does C++ have a Development Kit or does it come built into Eclipse?

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• How to motivate visitors to comment

  - by Michal

  At first I must apologize, because I am not sure if this question is valid for webmasters topic. I deal with the problem as being webmaster, however, i think this question is more related with marketing. Nevertheless, I was searching for marketing stack-overflow at meta stack-overflow and did not find such page. Background Four days ago, I launched a portal with database of barber salons at which people can find a salon through various criterions, see its photos, details, and also put a comment with their own opinion. The development took me half a year and it took me other 2 months to fill the database with information about barbers (I've also hired another three people to this job). I have not a big problem with getting people to my portal, I pay for PPC, comment on barber discussions etc.. In past four days I've reached a satisfactory number of visitors. Problem I deal with fact that everyone wants to search and read comments, but no one is willing to put her/his own opinion to barber. So I've tried following (2 days ago): Made comment anonymous, no one has to be afraid of compromise her/his identity with a salon owner I prepared a competition for users in which they can win a cosmetic package if they comment on at least three different salons I payed for PPC campaign on facebook which is telling people about the competition I registered competition on 20 portals for competitions And the result: People are commenting on facebook that the competition is a good idea They are giving likes on facebook But no one put a single comment to a barber salon I am getting little confused about what am I doing wrong. I will be thankful for any advice.

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• Library Organization in .NET

  - by Greg Ros

  I've written a .NET bitwise operations library as part of my projects (stuff ranging from get MSB set to some more complicated bitwise transformations) and I mean to release it as free software. I'm a bit confused about a design aspect of the library, though. Many of the methods/transformations in the library come with different endianness. A simple example is a getBitAt method that regards index 0 as the least significant bit, or the most significant bit, depending on the version used. In practice, I've found that using separate functions for different endianness results in much more comprehensible and reusable code than assuming all operations are little-endian or something. I'm really stumped regarding how best to package the library. Should I have methods that have LE and BE versions take an enum parameter in their signature, e.g. Endianness.Little, Endianness.Big? Should I have different static classes with identically named methods? such as MSB.GetBit and LSB.GetBit On a much wider note, is there a standard I could use in cases like this? Some guide? Is my design issue trivial? I have a perfectionist bent, and I sometimes get stuck on tricky design issues like this... Note: I've sort of realized I'm using endianness somewhat colloquially to refer to the order/place value of digital component parts (be they bits, bytes, or words) in a larger whole, in any setting. I'm not talking about machine-level endianness or serial transmission endianness. Just about place-value semantics in general. So there isn't a context of targeting different machines/transmission techniques or something.

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• Resize a pendrive Linux?

  - by user11239

  I'm running Ubuntu from USB media, which has a drive capacity of 250 GB, all existing as one FAT32 partition. However, when I created the bootable Ubuntu drive, only 4.79 GB were allocated for usage. Rather than put files directly into the /cdrom where the drive is mounted, I want to expand what is listed here in aufs to be at least 200 GB. I'm hopeful that I can do this live. Output of df : Filesystem 1K-blocks Used Available Use% Mounted on aufs 4051904 4050108 0 100% / none 1542852 284 1542568 1% /dev /dev/sdb1 244076800 4901648 239175152 3% /cdrom /dev/loop0 688000 688000 0 100% /rofs none 1547840 1496 1546344 1% /dev/shm tmpfs 1547840 4828 1543012 1% /tmp none 1547840 80 1547760 1% /var/run none 1547840 0 1547840 0% /var/lock none 1547840 0 1547840 0% /lib/init/rw Output of fdisk -l : Disk /dev/sdb: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00083fe4 Device Boot Start End Blocks Id System /dev/sdb1 * 1 30401 244196001 c W95 FAT32 (LBA) So basically what I want to do is get /dev/sdb1 to be entirely, or almost entirely read as aufs. I'm confused over how to do this, as the file systems are all part of /dev/sdb1 on one big partition, rather than separate partitions for separate file systems.

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• Google reverse an analytic

  - by Dan

  I am confused about what code must be executed to reverse a google analytic. I have the following code pasted within a test page: <body onLoad=”function()”> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-25305776-3']); _gaq.push(['_trackPageview']); _gaq.push(['_addTrans', '11455', // order ID - required '-42.38', // total - required '-2.38', // tax '-15.00' // shipping ]); _gaq.push(['_addItem', '11455', // order ID - necessary to associate item with transaction 'Evan Turner Turningpoint™ Basketball Pants', // product name '25.00', // unit price - required '-1' // quantity - required ]); _gaq.push(['_trackTrans']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); </script> Is this correct? Thanks!

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• GLSL billboard move center of rotation

  - by Jacob Kofoed

  I have successfully set up a billboard shader that works, it can take in a quad and rotate it so it always points toward the screen. I am using this vertex-shader: void main(){ vec4 tmpPos = (MVP * bufferMatrix * vec4(0.0, 0.0, 0.0, 1.0)) + (MV * vec4( vertexPosition.x * 1.0 * bufferMatrix[0][0], vertexPosition.y * 1.0 * bufferMatrix[1][1], vertexPosition.z * 1.0 * bufferMatrix[2][2], 0.0) ); UV = UVOffset + vertexUV * UVScale; gl_Position = tmpPos; BufferMatrix is the model-matrix, it is an attribute to support Instance-drawing. The problem is best explained through pictures: This is the start position of the camera: And this is the position, looking in from 45 degree to the right: Obviously, as each character is it's own quad, the shader rotates each one around their own center towards the camera. What I in fact want is for them to rotate around a shared center, how would I do this? What I have been trying to do this far is: mat4 translation = mat4(1.0); translation = glm::translate(translation, vec3(pos)*1.f * 2.f); translation = glm::scale(translation, vec3(scale, 1.f)); translation = glm::translate(translation, vec3(anchorPoint - pos) / vec3(scale, 1.f)); Where the translation is the bufferMatrix sent to the shader. What I am trying to do is offset the center, but this might not be possible with a single matrix..? I am interested in a solution that doesn't require CPU calculations each frame, but rather set it up once and then let the shader do the billboard rotation. I realize there's many different solutions, like merging all the quads together, but I would first like to know if the approach with offsetting the center is possible. If it all seems a bit confusing, it's because I'm a little confused myself.

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• How programmers can afford to NOT learn new things.

  - by newbie

  Good day! I am wondering how programmers learn many things because as a career shifter (from engineering to IT), I find it really hard to absorb everything. Three months ago, I learned HTML/CSS/Javascript. Two months ago, I learned mySQL and CCNA1. One month ago I learned C and Java. Now I am trying to learn J2EE. But it seems that I must combine everything I learned then add more into my brain (especially because J2EE is HUGE! -- XML, servlets, JSP, JSTL, EJB, frameworks(Hibernate, Structs, Spring), JDBC... and so on!!!) So I am wondering, how can programmers learn everything, then add something new without being confused of everything! Because Right now, I feel like my brain is going to explode because of information overload! And these knowledge I am trying to acquire are just the BASICS of programming (icing on the cake)! I still need to learn MORE to become a good programmer! And new technology emerges now and then that requires programmers to learn more again.. Learn.. learn.. learn... Any suggestions on how you as a programmer fit all you've learned into your brain? And how do you know which is the right thing for you to learn? Aren't you afraid that what you've learned may be obsolete next year then start learning again...?

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• Basics of Website development [closed]

  - by user975234

  I have read this post: What should every programmer know about web development? but I have some more questions... I will be developing a content related website very soon and I am confused about some technology stuff. I am thinking about developing the site using ruby on rails. So when I'll be buying hosting, do I need to ask for something special? Like for example, we need to specify what kind of hosting we need, windows or linux. So for ruby on rails do I need some extra facilities from the hosting provider? Is ruby on rails a good choice for a large content related website? This may be a bit stupid but how do I choose my backend, scripting languages etc? Thing is I am really new to website development. And the flow of making websites is not clear. Any links will be helpful. EDIT: I know this question has been voted as non constructive. But if any one still has some precise knowledge about how the flow of website development goes, please comment your views.. That will be helpful!

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• Why create a Huffman tree per character instead of a Node?

  - by Omega

  For a school assignment we're supposed to make a Java implementation of a compressor/decompresser using Huffman's algorithm. I've been reading a bit about it, specially this C++ tutorial: http://www.cprogramming.com/tutorial/computersciencetheory/huffman.html In my program, I've been thinking about having Nodes that have the following properties: Total Frequency Character (if a leaf) Right child (if any) Left child (if any) Parent (if any) So when building the Huffman tree, it is just a matter of linking a node to others, etc. However, I'm a bit confused with the following quote (emphasis mine): First, every letter starts off as part of its own tree and the trees are ordered by the frequency of the letters in the original string. Then the two least-frequently used letters are combined into a single tree, and the frequency of that tree is set to be the combined frequency of the two trees that it links together. My question: why should I create a tree per letter, instead of just a node per letter and then do the linking later? I have not begun coding, I'm just studying the algorithm first, so I guess I'm missing an important detail. What is it?

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• Need help to make a decision in career switch over? [closed]

  - by Fero

  I am a Software Engineer having 4 Years of experinece in web development using PHP, Drupal, MySql, Ajax and client site technologies like javascript, jquery,html and more. I have decided two platforms to switch over my career. SAP-ABAP (Because ABAP is related to coding) SALES FORCE One and only reason is that I am not getting good pack for the technologies what I am working with. Even top level companies are not ready to pay for this technologies. (And I am not expecting more.) To be honest I am good at technical and HR interviews too. So, I started to make an analysis of highly payable platforms and I got these two. SAP and Salesforce (Probabilty of On-site opportunity is also very high on both) Here my questions are: I am totally new to the above mentioned technologies. Which will be best suit for me ? Having basic ideas of the platforms what I have decided - But I am confused to choose I am having Good Coding experiencein PHP, Drupal as well as good experience in MySql. Having very good experience in creating sites related to E-Commerce, LMS, Q&A sites, Travel Sites, Blogs, Social networking site and more. Which I can learn easily or for which I can get good documentations online Kindly understand that I am not creating a debate over here. I hope Professionals over here can Show me the correct path.... I am waiting to travel on that...

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• Understanding Box2d Restitution & Bouncing

  - by layzrr

  I'm currently trying to implement basketball bouncing into my game using Box2d (jBox2d technically), but I'm a bit confused about restitution. While trying to create the ball in the testbed first, I've run into infinite bouncing, as described in this question, however obviously not using my own implementation. The Box2d manual describes restitution as follows: Restitution is used to make objects bounce. The restitution value is usually set to be between 0 and 1. Consider dropping a ball on a table. A value of zero means the ball won't bounce. This is called an inelastic collision. A value of one means the ball's velocity will be exactly reflected. This is called a perfectly elastic collision. My confusion lies in that I am still getting infinite bouncing with restitution values at 0.75/0.8. The same behavior can be seen in the testbed under Collision Watching - Varying Restitution, on the 6th and 7th balls. I believe the last one has restitution of 1, which makes sense, but I don't understand why the second to last ball bounces infinitely (as is happening with my working basketball I've created). I am looking to understand the restitution concept more fully, as well as look for a solution to infinite bouncing with the Box2d framework. My instinct was to sleep objects that appeared to be moving in very small increments, but this seems like a misuse of the engine. Should I just work with lower restitution values altogether?

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• How exactly is an Abstract Syntax Tree created?

  - by Howcan

  I think I understand the goal of an AST, and I've build a couple of tree structures before, but never an AST. I'm mostly confused because the nodes are text and not number, so I can't think of a nice way to input a token/string as I'm parsing some code. For example, when I looked at diagrams of AST's, the variable and its value were leaf nodes to an equal sign. This makes perfect sense to me, but how would I go about implementing this? I guess I can do it case by case, so that when I stumble upon an "=" I use that as a node, and add the value parsed before the "=" as the leaf. It just seems wrong, because I'd probably have to make cases for tons and tons of things, depending on the syntax. And then I came upon another problem, how is the tree traversed? Do I go all the way down the height, and go back up a node when I hit the bottom, and do the same for it's neighbor? I've seen tons of diagrams on ASTs, but I couldn't find a fairly simple example of one in code, which would probably help.

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• Best practice for designing a risk-style board game

  - by jyanks

  I'm just trying to figure out how to set up the code for a game like risk... I would like it to be extensible, so that I can have multiple maps (ie- World, North America, Eurasia, Africa) so hardcoding in the map doesn't seem to make a whole lot of sense I'm a bit confused on how/where items should be stored/accessed. Here are the objects I see the game theoretically using: -Countries/Territories -Cities (Can be contained within territories) -Capitols -Connections -Continents -Map -Troops At the moment, I feel like: -A map should have a list of continents and countries. The continents would be more of a 'logical' thing where the continents would just be lists of countries that are checked for bonuses at the start of turns -Countries should have a list of countries that they're connected to for the connections What I can't figure out is: Where do I store the troops? Do I have an object for every single troop or do I just store the number of troops on a country object as an integer? What about capitols and cities? Do those just have a reference to the country they reside in? Is there anything I'm not seeing here that's going to screw me over in the long run with the way that I'm thinking about things now? Any advice would be appreciated.

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