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• dvcs - is "clone to branch" a common workflow?

  - by Tesserex

  I was recently discussing dvcs with a coworker, because our office is beginning to consider switching from TFS (we're a MS shop). In the process, I got very confused because he said that although he uses Mercurial, he hadn't heard of a "branch" or "checkout" command, and these terms were unfamiliar to him. After wondering how it was possible that he didn't know about them and explaining how dvcs branches work "in place" on your local files, he was quite confused. He explained that, similar to how TFS works, when he wants to create a "branch" he does it by cloning, so he has an entire copy of his repo. This seemed really strange to me, but the benefit, which I have to concede, is that you can look at or work on two branches simultaneously because the files are separate. In searching this site to see if this has been asked before I saw a comment that many online resources promote this "clone to branch" methodology, to the poster's dismay. Is this actually common in the dvcs community? And what are some of the pros and cons of going this way? I would never do it since I have no need to see multiple branches at once, switching is fast, and I don't need all the clones filling up my disk.

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• Huge spike in traffic tracked by Google Analytics from Safari browsers

  - by Petra Barus

  My site urbanindo.com recently experienced huge spike in traffic tracked by Google Analytics. The huge spike sometime shows in several same pages. This is odd because I rarely experienced that much traffic before. Some pages can have hundreds of visitors at the same time. But when I read the webserver log, those pages only showed up in only one or two entries, not hundreds like the GA showed. But the only similar thing about the entries is that they are using similar browser agent. Mozilla/5.0 (iPad; CPU OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3 Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3 And when I opened the Google Analytics Audience Technology Browsers & OS and I plotted the chart based on the browsers, I saw that the huge spike came from Safari. This huge spikes started to happen since the beginning of this August, which happens to be when I use multiple webservers behind load balancer (although I'm pretty sure those two are not relevant). Is there something wrong with my GA configuration?

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• ArchBeat Link-o-Rama for December 12, 2012

  - by Bob Rhubart

  “Cloud Integration in Minutes” – True or False? | Bruce Tierney The answer is 'True, but..." according to Bruce Tierney. "Connecting on-premise and cloud applications “in minutes” is true…provided you only consider the connectivity subset of integration and have a small number of cloud integration touch points." Get the rest of the story in Bruce's detailed post. Tech World Discovers New Species: The Cloud Architect | Wired Enterprise | Wired.com This Wired article by Cade Metz boils down to one essential conclusion: Cloud computing is a significant departure from "data center designs of the past," and the demand for the specialized skills of the cloud architect will only increase. But you already knew that, right? Oracle B2B - Synchronous Request Reply | A-Team - SOA "Beginning with Oracle SOA Suite PS5 (11.1.1.6), B2B supports synchronous request reply over http using the b2b/syncreceiver servlet," says C. D. Wright of the Fusion Middleware A-Team. His post includes a demo and everything you need to run it. Thought for the Day "Don't worry about what anybody else is going to do… The best way to predict the future is to invent it." — Alan Kay (Month Day, Year - Month Day, Year) Source: SoftwareQuotes.com

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• Ubunto 12.10 Boots to purple screen

  - by Ric

  I know this question has been tackled in a couple different threads but I've tried what I could from those and have not resolved the issue. I have just a basic understanding of this system so feel free to talk down to me or explain this like you would to a 5 year old. Let's start from the beginning. My son has a computer built by an IT friend of mine (we moved so he can't help any more). It had Windows XP running on it and it just stopped working correctly. This same friend had built a laptop for me with Ubuntu which I liked so I thought I'd put a new OS on my sons computer and it may work better. I downloaded Ubuntu 12.10 onto a USB drive and loaded it onto his computer. I followed all the prompts, it installed, I restarted the computer, it gives me the option of which OS to pick. I pick Ubuntu and it seemingly loads. The desktop comes up with just the basic pinkish Ubuntu background but that is it. There are no icons. I can't right click anywhere to create a file. Left clicking the mouse does not create a square when moved. Alt + F2 doesn't do anything. I can open a terminal but any of the commands I have seen in previous threads do not correct any issues. What else can I do, or what resources are available to fix this problem? I don't know if there are additional files on the USB drive that I need to access or what. Also, one of the problems we were having with my sons computer is that windows would only load to a blank screen. It runs accordingly in safemode and my install of Ubuntu was through safemode of Windows XP.

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• TechEd North America 2012-Day 4 #msTechEd #teched

  - by Marco Russo (SQLBI)

  I hadn’t time yesterday to write a blog post before of the beginning of the day and I recover now that I’m already back to Europe. I spent many hours at the Microsoft booth meeting people who asked questions about Tabular, Power View and PowerPivot. I have to say that I’m really glad so many people started using PowerPivot and of the large interest around Tabular. During my BISM: Multidimensional vs. Tabular I’ve been helped by Alberto during the demo (we joked about he was the demo monkey) and the feedback received are good. I tried to compare the strength and weakness of the two modeling options without spending time describing the area in which they are similar. During the days before I had many discussions about scenarios based on snapshots and I added a few slides to the presentation in order to cover this area that I thought was marginal but seems to be a very common one. To know more, watch the presentation when it will be available or wait for some article I’ll write in the future describing these patterns. In less than 10 days, I’ll be at TechEd Europe and I’m really looking forward to meet other Tabular developers and PowerPivot users there!

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• Sneak Preview - New CodePlex UI

  We have been busy the last several months working to improve the overall experience for the CodePlex community. We have been working through some of the top requested items, such as our big announcement last week enabling Git. Something that is not explicitly on the feature request list are requests to update the web site look and user experience.  As Brian Harry mentioned, the Future of CodePlex is Bright, so it is time to start brightening up the place. Goals As with any sizeable change you need to decide the scope of changes you want to tackle. We decided that we would optimize on incremental improvements verses taking months to get a completely new experience released. Our goals with this user experience work is to refresh the look and feel of the site, introduce new visual elements and set up the site for future structural changes. So this is not the end, just the beginning. Early Views I want to set a few expectations first, these screen shots are not final, and we are still working through the content and final element placement. Feedback is always welcome, just take that in mind as you review the images. New CodePlex Home The navigation changed a good bit on the home page and we have moved the search to a more consistent location across the site.   User Profile Users Home Page The goal was to make it easier to find and take action on common tasks such as creating projects. Project Home Issue Tracker   This should give you a taste of where we are going with the new user experience.     As always we love the feedback, either comment below, find us on Twitter @codeplex or @mgroves84, or create or vote up suggestions.

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• Ubuntu won't start - blank screen with flashing white cursor

  - by loomy

  My laptop is dual-booted with Windows 8 on one partition and Ubuntu 12.04.3 on the other. I've searched for my issue already, but nothing I've found so far has solved the problem. Since last week, when I try to boot Ubuntu from GRUB, I am taken to a purple screen (as usual), but then to a black screen with a blinking white _ cursor. I've tried leaving it, but nothing else happens. When I hold Shift and edit the GRUB entry to change 'quiet slash' to 'text', the back screen instead asks for my login and password. When I put them in, it tells me the date of my last logon, and then waits for further commands. Being very very new to Ubuntu, I have no idea at all what to try out at this point. I tried to launch FailsafeX, but while that was beginning, it said "unable to run server /usr/bin/x" No such file or directory", then shortly after returned to the recovery mode menu. Pressing Ctrl+Alt+Delete goes through an Ubuntu loading screen, then the laptop then restarts. Any suggestions will be very appreciated, and apologies if this is a common issue that has been answered a million times before.

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• Learning a new concept - write from scratch or use frameworks?

  - by Stu

  I have recently been trying to learn about MVVM and all of the associated concepts such as repositories, mediators, data access. I made a decision that I would not use any frameworks for this so that I could gain a better understanding of how everything worked. I’m beginning to wonder if that was the best idea because I have hit some problems which I am not able to solve, even with the help of Stack Overflow! Writing from scratch I still feel that you have a much better understanding of something when you have been in the guts of it than if you were at a higher level. The other side of that coin is that you are in the guts of something that you don't fully understand which will lead to bad design decisions. This then makes it hard to get help because you will create unusual scenarios which are less likely to occur when you working within the confines of a framework. I have found that there are plenty of tutorials on the basics of a concept but very few that take you all the way from novice to expert. Maybe I should be looking at a book for this? Using frameworks The biggest motivation for me to use frameworks is that they are much more likely to be used in the workplace than a custom rolled solution. This can be quite a benefit when starting a new job if it's one less thing you have to learn. I feel that there is much better support for a framework than a custom solution which makes sense; many more people are using the framework than the solution that you created. The level of help is much wider as well, from basic questions to really specific, detailed questions. I would be interested to hear other people's views on this. When you are learning something new, should you/do you use frameworks or not? Why? If it's a combination of both, when do you stop one and move on to the other?

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• Shutting down Ubuntu 11.10 with power button without x11-session

  - by RJdaMoD

  when pressing the power-button inside a (gnome-)session, ubuntu asks me what to do and shuts down after 60 seconds anyway. No problem so far. But if i'm not logged in in a gnome-session (for example in the login screen), or just change to a tty, then the power-button won't work. But i remember that i worked in 11.04. So what's changed and how to restore? Background: I use my machine as a print server. If im not home and my wife wants to print sth., she used to switch on my machine, print via her laptop, and then just shut it down by power-button. Beginning of march i was on a business tour, and she called me that she could not shutdown my machine anymore. I shut it down by ssh, but this seems not the favorable way to me. I already had a look in /etc/acpi/powerbtn.sh and think that the line if pidof x $PMS > /dev/null; then exit is the cause for this since it aborts the script when no gui-power-manager is found. Is that right? But that does not explain with the power-button does not work when switching from the x11-session to a tty, although this would not be critical to me. Thanks in advance Greetings RJ

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• Why is the US international keyboard layout on Ubuntu different?

  - by pablo

  I have been using Linux on and off for 10 years, and more recently I have spent more time with OSX. But, I still remember that in the beginning I'd choose the US international keyboard layout and it would have exactly the same output as the Windows keyboard layout (and most recently, the OSX US international layout). However, a few years ago when I installed Ubuntu, I noticed that the cedilla wasn't printed anymore (ç or Ç). This is a combination of the following keys: ' + c. Instead, what I get is the c letter. When did it start to happen, and why the difference to the behavior on the other OSes? What puzzles me even more is that there is even an "US International alternative" keyboard layout, which prints exactly the same keys! So, what's it alternative to? This has been reported as a bug back to Canonical (can't find the link now), but the keyboard layout has never changed back to what I'd expect. I know the workarounds to fix it to what I need, but I just would like to know why/when it has become different.

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• C++ program...overshoots? [migrated]

  - by Zdrok

  I'm decent at C++, but I may have missed some nuance that applies here. Or maybe I completely missed a giant concept, I have no idea. My program was instantly crashing ("blah.exe is not responding") about 1/5 times it was run (other times it ran completely fine) and I tracked the problem down to a constructor for a world class that was called once in the beginning of the main function. Here is the code (in the constructor) that causes the problem: int ii; for(ii=0;ii<=255;ii++) { cout<<"ent "<<ii<<endl; entity_list[ii]=NULL; } for(ii=0;ii<=255;ii++) { cout<<"sec "<<ii<<endl; sector_list[ii]=NULL; } entity_list[0] = new Entity(0,0); entity_list[0]->_world = this; Specifically the second for loop. The cout references are new for the sake of telling where it is having trouble. It would print the entire "ent 1" to "ent 255" and then "sec 1" to "sec 255" and then crash right after, as if it was going for a 257th run through of the second for loop. I set the second for loop to go until "ii<=254" which stopped all crashes. Does C++ code tend to "overshoot" for loops or something? What is causing it to crash at this specific loop seemingly at random? By the way, entity_list and sector_list point to classes called Entity and Sector, respectively, but they are not constructing anything so I didn't think it would be relevant. I also have a forward declaration for the Entity class in a header for this, but since none were being constructed I didn't think it was relevant either. EDIT: It was due to the new Entity line, I assumed wrongly that the fact that altering the for statement to 254 fixed the crashes meant that it had to be there. I still don't understand why the for loop is related, though.

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• Is writing recursive functions hard for you?

  - by null

  I'm taking a computer science course now. I feel it is so hard compared to my polytechnic IT course. I can't understand recursive methods well. How do you manage to get your brain to understand it? When the recursive method returns back, my brain can not trace it nicely. Is there a better way to understand recursion? How do you start learning it? Is it normal that feel that it is very hard at then beginning? Look at the example, I'm very surprised how can I write this if it appears in exam. public class Permute { public static void main(String[] args) { new Permute().printPerms(3); } boolean[] used; int max; public void printPerms(int size) { used = new boolean[size]; max = size; for (int i = 0; i < size; i++) { used[i] = false; } perms(size, ""); } public void perms(int remaining, String res) { if (remaining == 0) { System.out.println(res); } else { for (int i = 0; i < max; i++) { if (!(used[i])) { used[i] = true; perms(remaining - 1, res + " " + i); used[i] = false; } } } } }

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• How should a JEE application store credentials for logging in to an external system?

  - by FGreg

  I am in a situation where I have a Web Application (WAR) that is accessing a REST service provided by another application. The REST service uses Basic HTTP Authentication. So that means the application calling the REST service needs to store user credentials somehow. To further complicate things, this is an enterprise, so there are different 'regions' the application moves through which will have different credentials for the same service (think local development, development region, integration region, user test region, production, etc...) My first instinct is that the credentials should be stored by the JEE container and the application should ask the container for the credentials (probably via JNDI?). I'm beginning to read about Java Authentication and Authorization Service (JAAS) but I'm not sure if that is the appropriate solution to this problem. How should a JEE application store credentials for logging in to an external system? A few more details about my WAR. It is a Spring-Integration project that has no front-end. The container I am working with is Websphere. I am using JEE 5 and Spring 4.0.1. To this point I have not needed to consider spring-security... does this situation mean I should re-evaluate that decision?

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• Is there a massive other side to software development which I've somehow missed, revolving entirely around Microsoft?

  - by Aerovistae

  I'm still a beginning programmer; I've been at it for 2 years. I've learned to work with a few languages, a bit of web development technologies, a handful of libraries, frameworks, and IDEs. But over the past two years (and long before I even started, really), I keep hearing references to these...things. A million of them. Things such as C#, ADO, SOAP, ASP, ASP.NET, the .NET framework, CLR, F#, etc etc. And I've read their Wikipedia articles, in-depth, multiple times, and they all mention a million other things on that list, but I just can't seem to grasp what it all is. The only thing I've taken away with any certainty is that Microsoft is behind all of it. It sounds almost like a conspiracy. Are all these technologies just for developing on the Windows platform? What is .NET? Do some software developers dedicate their entire career just to that side of things? Why would I want to get into it, and what advantage does...whatever it is...have over all the other technologies there are? I hope this makes sense. It's a broad question, but inside it there's a very specific question asking about something I don't know the name of. Hopefully you can grasp my confusion.

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• What patterns book for iOS development contains this specific information? [closed]

  - by Brett Ryan

  I've read several books on iOS development and Objective-C, however what a lot of them teach is how to work with interfaces and all contain the model inside the view controller, i.e. a UITableViewController based view will simply have an NSArray as it's model. I'm interested in what the best practices are for designing the structure of an application. Specifically I'm interested in best practices for the following: How to separate a model from the view controller. I think I know how to do this by simply replacing the NSArray style example with a specific model object, however what I do not know how to do is alert the view when the model changes. For example in .NET I would solve this by conforming to INotifyPropertyChanged and databinding, and similarly with Java I would use PropertyChangeListener. How to create a service model for my domain objects. For example I want to learn the best way to create a service for a hypothetical Widget object to manage an internal DB and also services for communicating with remote endpoints. I need to learn the best ways to do this in a way that interface components can subscribe to events such as widgetUpdated. These services should be singleton classes and some how dependency injected into model/controller objects. Books I've read so far are: Programming in Objective-C (4th Edition) Beginning iOS 5 Development: Exploring the iOS SDK The iOS 5 Developer's Cookbook: Expanded Electronic Edition: Essentials and Advanced Recipes for iOS Programmers Learn Objective-C on the Mac: For OS X and iOS I've also purchased the following updated books but not yet read them. The Core iOS 6 Developer's Cookbook (4th edition Programming in Objective-C (5th Edition) I come from a Java and C# background with 15 years experience, I understand that many of the ways I would do things in these languages may not fit to the ObjC way of developing applications. Would someone be able to provide me with the book on this topic containing this specific subject matter?

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• Is there any kind of established architecture for browser based MMO games?

  - by black_puppydog

  I am beginning the development of a broser based game in which players take certain actions at any point in time. Big parts of gameplay will be happening in real life and just have to be entered into the system. I believe a good kind of comparison might be a platform for managing fantasy football, although I have virtually no experience playing that, so please correct me if I am mistaken here. The point is that some events happen in the program (i.e. on the server, out of reach for the players) like pulling new results from some datasource, starting of a new round by a game master and such. Other events happen in real life (two players closing a deal on the transfer of some team member or whatnot - again: have never played fantasy football) and have to be entered into the system. The first part is pretty easy since the game masters will be "staff" and thus can be trusted to a certain degree to not mess with the system. But the second part bothers me quite a lot, especially since the actions may involve multiple steps and interactions with different players, like registering a deal with the system that then has to be approved by the other party or denied and passed on to a game master to decide. I would of course like to separate the game logic as far as possible from the presentation and basic form validation but am unsure how to do this in a clean fashion. Of course I could (and will) put some effort into making my own architectural decisions and prototype different ideas. But I am bound to make some stupid mistakes at some point, so I would like to avoid some of that by getting a little "book smart" beforehand. So the question is: Is there any kind of architectural works that I can read up on? Papers, blogs, maybe design documents or even source code? Writing this down this seems more like a business application with business rules, workflows and such... Any good entry points for that?

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• Cannot boot after installing ubuntu on lenovo x120e

  - by tutysara

  I have installed ubuntu 11.10 on my x120e using amd64 alternate iso image. The installation went fine, but it is having issues while booting after a successful installation, it says - "No Operating System Found". I followed the instruction at - help.ubuntu.com/community/X120e#Installation to purge grub-efi and installed grub-pc, even then I couldn't boot into ubuntu.(got the same "No Operating System Found") This is the file from boot-repair with this setup - http://pastebin.ubuntu.com/926556/ Then I asked in #ubuntu and they suggested me to create a bios-boot partition, I was not very comfortable with the solution they had suggested but gave it a try anyhow. I re-sized my initial partition and made 4 MB free space in the beginning of the partition and had set the flag bios_grub. Re-installed ubuntu 11.10 this time using amd64 desktop iso image file. Installation went fine as before but finally this time also the system didn't boot, it gave the same - "No Operating System Found" message. In BIOS I have the settings as to use both (Legacy and UEFI) and with UEFI tried first. This is the boot-repair file from my latest setup - http://pastebin.ubuntu.com/926761 Any help/suggestions are appreciated.

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• How do I write to an outer truecrypt volume when the inner volume protection prevents writng?

  - by con-f-use

  In a nutshell After some time using the outer volume of a hidden volume in Truecrypt I cannot write to the outer volume anymore. The protection of the inner volume always kicks in before. How do I fix this? Details I'm using truecrypt's two layered encryption of a USB stick. The outer container carries my semi-sensitive stuff while the inner hidden values has a bit more valuable information. I use both, the inner and outer volume regularly and that is part of the problem. Truecrypt can mount the outer volume for writing while protecting the inner. Usually the inner volume, when not protected this way (or mounted read-only) would be indistinguishable from free space. That is of course part of the plausible deniability scheme of truecrypt. At the beginning, everything worked as expected. I could copy and delete data to the outer volume as I pleased. Now it seams that I have written and deleted enough data to have filled the outer volume once. Despite the write protection Ubuntu tries now to write to the continuous "free space" that is the inner volume. It does that although enough other free space is on the outer volume. But on this free space there used to be data so its fragmented and the file system write prefers continuous space. The write on the continuous free space of the outer volume of course fails (with the error message in the picture above) as Truecrypt's inner-volume-protection kicks in. The Question I know this is expected behaviour, but is there a better way to write to the outer volume that does not attempt to write to the hidden free space at the end? The whole question could be more generally rephrased to: How do I control, where on a partition data is written in Ubuntu?

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• BUILD 2013 Sessions&ndash;Building Great Windows Phone UI in XAML

  - by Tim Murphy

  Originally posted on: http://geekswithblogs.net/tmurphy/archive/2013/06/27/build-2013-sessionsndashbuilding-great-windows-phone-ui-in-xaml.aspx Even the simplest of smart phone apps can be a challenge to give a compelling UI regardless of the platform.  Windows Phone and XAML are no exception.  That is what got my interest in this session by Shawn Oster.  He took a checklist type approach to the subject is good considering that is about the only way that many us get things done. Shawn started out giving us a set of bad design/good design examples.  They very effectively showed how good design gives a sense of professionalism to your app that could determine if your wonderful idea actually makes money is DOA. I won’t go over all his points since you will be able to get the session online, but a few of his checklist points included design from the beginning instead of as an afterthought, not being afraid to leave white space and making sure your application elegantly supports both landscape and portrait modes.  The many gems make this a must watch for any developers who struggle with visual design. del.icio.us Tags: BUILD 2013,Windows Phone,XAML,Design

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• Deal Registration Moves to Oracle Partner Store (OPS)- The Four Action Items for Partners

  - by Richard Lefebvre

  In November 2012, Oracle’s partner deal registration process will move to the Oracle Partner Store (OPS). During this time, OPS will become the single source for partners to register deals, obtain deal status, and place orders. What will partners need to do? 1. Request an OPS Account – If your company is new to OPS the first thing you need to do is request an account (if your company already has an OPS account, go to step 2). It’s important to have the person who will be managing your OPS account make this request as soon as possible. They will be set up as your company’s primary administrator. 2. Set-Up Users in OPS – Setup of users can start immediately, and will be handled by the primary OPS administrator at your company. The process is simple, but all existing users of Global PRM (Partner Relationship Management) deal registration will need to be set up in OPS before November 14, 2012.  3. Review/Action Any Registrations Pending Submission in PRM – Prior to November 14, 2012, all pending registrations should be submitted in the existing PRM system. It is important that this step is complete so registrations will not need to be re-entered when the system is moved to OPS on November 17, 2012. Registrations pending submission are easily identified on the registration listing screen with either “Incomplete” or “Returned to Partner” in the status column.  4. Attend Training – Oracle will offer multiple VAD and VAR training sessions beginning October 29, 2012. It is recommended that all users attend one of these important sessions.  Detailed instructions on each of these tasks can be found on the OPS Information Page. OPS will offer several enhancements to the deal registration process, including: Simplified Registration Form Easier Product Selection Expanded Browser Support Shared Registration Visibility Between VAD and VAR Pre-set Customer Selection From Partner Ordering Base Best Regards, Titina Ott Vice President, Worldwide A&C Systems And Business Processes 

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• What sorts of tools make a Django Developer valuable? [closed]

  - by MrOodles

  I am a Django Consultant and I want to increase the value that I provide to clients. My first question was an epic failure according to the FAQ. So I'll try again before I delete it. What types of tools should a Django developer have in his tool belt to increase the value to the client? Would a collection of project templates be useful? Are there open-source project templates available that can be forked and altered? Is there a proper way to configure templates to include dependencies for certain types of projects? What about deployment scripts using tools like Puppet or Chef? Does it make a lot of sense to fork Django apps on GitHub and make contributions to open source projects there? Would clients percieve extra value in programmers that are contributing to open source projects? Are there industry best practices for implementing continuous integration in a Django project? I want the answer to be open ended, as I'm at the beginning of my research. I am curious to know what sorts of tools other Django consultants use on a daily and per-project basis, and how they use them.

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• How do I interpolate air drag with a variable time step?

  - by Valentin Krummenacher

  So I have a little game which works with small steps, however those steps vary in time, so for example I sometimes have 10 Steps/second and then I have 20 Steps/second. This changes automatically depending on how many steps the user's computer can take. To avoid inaccurate positioning of the game's player object I use y=v0*dt+g*dt^2/2 to determine my objects y-position, where dt is the time since the last step, v0 is the velocity of my object in the beginning of my step and g is the gravity. To calculate the velocity in the end of a step I use v=v0+g*dt what also gives me correct results, independent of whether I use 2 steps with a dt of for example 20ms or one step with a dt of 40ms. Now I would like to introduce air drag. For simplicity's sake I use a=k*v^2 where a is the air drag's acceleration (I am aware that it would usually result in a force, but since I assume 1kg for my object's mass the force is the same as the resulting acceleration), k is a constant (in this case I'm using 0.001) and v is the speed. Now in an infinitely small time interval a is k multiplied by the velocity in this small time interval powered by 2. The problem is that v in the next time interval would depend on the drag of the last which again depends on the v of the last interval and so on... In other words: If I use a=k*v^2 I get different results for my position/velocity when I use 2 steps of 20ms than when I use one step of 40ms. I used to have this problem for my position too, but adding +g*dt^2/2 to the formula for my position fixed the problem since it takes into account that the position depends on the velocity which changes slightly in every infinitely small time interval. Does something like that exist for air drag too? And no, I dont mean anything like Adding air drag to a golf ball trajectory equation or similar, for that kind of method only gives correct results when all my steps are the same. (I hope you can understand my intermediate english, it's not my main language so I would like to say sorry for all the silly mistakes I might have made in my question)

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• Do we ethically have the right to use the MAC Address for verification purposes?

  - by Matt Ridge

  I am writing a program, or starting at the very beginning of it, and I am thinking of purchase verification systems as a final step. I will be catering to Macs, PCs, and possibly Linux if all is said and done. I will also be programming this for smartphones as well using C++ and Objective-C. (I am writing a blueprint before going head first into it) That being said, I am not asking for help on doing it yet, but what I’m looking for is a realistic measurement for what could be expected as a viable and ethical option for purchase verification systems. Apple through the Apple Store, and some other stores out there have their own "You bought it" check. I am looking to use a three prong verification system. Email/password 16 to 32 character serial number using alpha/numeric and symbols with Upper and lowercase variants. MAC Address. The first two are in my mind ok, but I have to ask on an ethical standpoint, is a MAC Address to lock the software to said hardware unethical, or is it smart? I understand if an Ethernet card changes if not part of the logic board, or if the logic board changes so does the MAC address, so if that changes it will have to be re-verified, but I have to ask with how everything is today... Is it ethical to actually use the MAC address as a validation key or no? Should I be forward with this kind of verification system or should I keep it hidden as a secret? Yes I know hackers and others will find ways of knowing what I am doing, but in reality this is why I am asking. I know no verification is foolproof, but making it so that its harder to break is something I've always been interested in, and learning how to program is bringing up these questions, because I don't want to assume one thing and find out it's not really accepted in the programming world as a "you shouldn't do that" maneuver... Thanks in advance... I know this is my first programming question, but I am just learning how to program, and I am just making sure I'm not breaking some ethical programmer credo I shouldn't...

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• Why is a software development life-cycle so inefficient?

  - by user87166

  Currently the software development lifecycle followed in the IT company I work at is: The "Business" works with a solution manager to build a Business Requirement document The solution manager works with the Program manager to build a Functional Spec The PM works with the engineering lead to develop a release plan and with the engineering team to develop technical specifications If there are any clarifications required, developers contact the PM who contacts the solution manager who contacts the business and all the way back introducing a latency of nearly 24 hours and massive email chains for any clarifications By the time the tech spec is made, nearly 1 month has passed in back and forth Now, 2 weeks go to development while the test writes test cases Code is dropped formally to test, test starts raising bugs. Even if there is 1 root cause for 10 different issues, and its an easily fixed one, developers are not allowed to give fresh code to test for the next 1 week. After 2-3 such drops to test the code is given to the ops team as a "golden drop" ( 2 months passed from the beginning) Ops team will now deploy the code in a staging environment. If it runs stable for a week, it will be promoted to UAT and after 2 weeks of that it will be promoted to prod. If there are any bugs found here, well, applying for a visa requires less paperwork This entire process is followed even if a single SSRS report is to be released. How do other companies process such requirements? I'm wondering why, the business cannot just drop the requirements to developers, developers build and deploy to UAT themselves, expose it to the business who raise functional bugs and after fixing those promote to prod. (even for more complex stuff)

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• Finite Numbers and ExplorerCanvas

  - by PhubarBaz

  I was working on my online mathematical graphing application, CloudGraph, and trying to make it work in IE. The app uses the HTML5 canvas element to draw graphs. Since IE doesn't support canvas yet I use ExplorerCanvas to provide that support for IE. However, it seems that when using excanvas, if you try to moveTo or drawTo a point that is not finite it loses it's mind and stops drawing anything else after that. I had no such problems in Firefox or Chrome so it took me awhile to figure out what was going on. Next I discovered that I needed a way to check if a variable was NaN or Inifinity or any other non-finite value so I could avoid calling moveTo() in that case. I started writing a long if statement, then I thought there has to be a better way. Sure enough there was. There just happens to be an isFinite() function built into Javascript just for this purpose. Who knew! It works great. Another difference I discovered with excanvas is that you must specify a starting point using a moveTo() when beginning a drawing path. Again, Chrome and Firefox are a lot more forgiving in this area so it took me a while to figure out why my lines weren't drawing. But, all is happy now and I'm a little wiser to the ways of the canvas.

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