Search Results

Search found 22301 results on 893 pages for 'software sources'.

Page 78/893 | < Previous Page | 74 75 76 77 78 79 80 81 82 83 84 85  | Next Page >

  • Floating point undesirable in highly critical code?

    - by Kirt Undercoffer
    Question 11 in the Software Quality section of "IEEE Computer Society Real-World Software Engineering Problems", Naveda, Seidman, lists fp computation as undesirable because "the accuracy of the computations cannot be guaranteed". This is in the context of computing acceleration for an emergency braking system for a high speed train. This thinking seems to be invoking possible errors in small differences between measurements of a moving object but small differences at slow speeds aren't a problem (or shouldn't be), small differences between two measurements at high speed are irrelevant - can there be a problem with small roundoff errors during deceleration for an emergency braking system? This problem has been observed with airplane braking systems resulting in hydroplaning but could this actually happen in the context of a high speed train? The concern about fp errors seems to not be well-founded in this context. Any insight? The fp is used for acceleration so perhaps the concern is inching over a speed limit? But fp should be just fine if they use a double in whatever implementation language. The actual problem in the text states: During the inspection of the code for the emergency braking system of a new high speed train (a highly critical, real-time application), the review team identifies several characteristics of the code. Which of these characteristics are generally viewed as undesirable? The code contains three recursive functions (well that one is obvious). The computation of acceleration uses floating point arithmetic. All other computations use integer arithmetic. The code contains one linked list that uses dynamic memory allocation (second obvious problem). All inputs are checked to determine that they are within expected bounds before they are used.

    Read the article

  • Should I avoid or embrace asking questions of other developers on the job?

    - by T.K.
    As a CS undergraduate, the people around me are either learning or are paid to teach me, but as a software developer, the people around me have tasks of their own. They aren't paid to teach me, and conversely, I am paid to contribute. When I first started working as a software developer co-op, I was introduced to a huge code base written in a language I had never used before. I had plenty of questions, but didn't want to bother my co-workers with all of them - it wasted their time and hurt my pride. Instead, I spent a lot of time bouncing between IDE and browser, trying to make sense of what had already been written and differentiate between expected behavior and symptoms of bugs. I'd ask my co-workers when I felt that the root of my lack of understanding was an in-house concept that I wouldn't find on the internet, but aside from that, I tried to confine my questions to lunch hours. Naturally, there were occasions where I wasted time trying to understand something in code on the internet that had, at its heart, an in-house concept, but overall, I felt I was productive enough during my first semester, contributing about as much as one could expect and gaining a pretty decent understanding of large parts of the product. I was wondering what senior developers felt about that mindset. Should new developers ask more questions to get to speed faster, or should they do their own research for themselves? I see benefits to both mindsets, and anticipate a large variety of responses, but I figure new developers might appreciate your answers without thinking to ask this question.

    Read the article

  • I can not download anything

    - by Jason Machen
    I am very new to ubuntu but decided to wipe my windows 7 and install it. I can not download anything from the software center. This is the error message I get. I can use the web in all other ways including this site. What can I do? Thanks, Jason W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/main/source/Sources 404 Not Found [IP: 91.189.91.13 80] W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/raring-security/restricted Plus about 20 other lines.

    Read the article

  • Quick and Good: ( Requirement -> Validation -> Design ) for self use?

    - by Yugal Jindle
    How to casually do the required Software Engineering and designing? I am an inexperienced developer and face the following problem: My company is a start up and has no fix Software engineering systems. I am assigned tasks with not very clear and conflicting requirements. I don't have to follow any designs or verify requirements officially. Problem: I code all day and finally get stuck where requirement conflicts and I have to start over again. I can-not spend a lot of time doing proper SRS or SDD. How should I: List out Requirements for myself. (Not an official document) How to verify and validate the requirements? How to visualize them? How to design them with minimum effort? (As its going to be with me only) I don't want to waste my time coding something that's gonna collapse according to requirement conflict or something! I don't want to compromise with quality but don't want to re-write everything on some change that I didn't expected. I imagine making a diagram for my thought process that will show me conflict in the diagram itself, then finally correcting the diagram - I decide my design and structure my code in terms of interfaces or something. And then finally start implementing my design. I am able to sense the lack of systematic approach, but don't know how to proceed! Update: Please suggest me some tools that can ask me the questions and help me aggregate important details. How can I have diagram that I talked about for requirement verification?

    Read the article

  • Changing Wallpaper on 12.04 Login Screen

    - by userIsAMonkey
    I'm using this link but seems to be not working on 12.04, here's the Terminal message below: Are there other softwares/tips for changing the login screen? I'm also using link but seems outdated. Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/source/Sources 404 Not Found W: Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ppa.launchpad.net/claudiocn/slm/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found E: Some index files failed to download. They have been ignored, or old ones used instead. law@ubuntu:~$ sudo apt-get install simple-lightdm-manager Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package simple-lightdm-manager

    Read the article

  • How can I better manage far-reaching changes in my code?

    - by neuviemeporte
    In my work (writing scientific software in C++), I often get asked by the people who use the software to get their work done to add some functionality or change the way things are done and organized right now. Most of the time this is just a matter of adding a new class or a function and applying some glue to do the job, but from time to time, a seemingly simple change turns out to have far-reaching consequences that require me to redesign a substantial amount of existing code, which takes a lot of time and effort, and is difficult to evaluate in terms of time required. I don't think it has as much to do with inter-dependence of modules, as with changing requirements (admittedly, on a smaller scale). To provide an example, I was thinking about the recently-added multi-user functionality in Android. I don't know whether they planned to introduce it from the very beginning, but assuming they didn't, it seems hard to predict all the areas that will be affected by the change (apps preferences, themes, need to store account info somehow, etc...?), even though the concept seems simple enough, and the code is well-organized. How do you deal with such situations? Do you just jump in to code and then sort out the cruft later like I do? Or do you do a detailed analysis beforehand of what will be affected, what needs to be updated and how, and what has to be rewritten? If so, what tools (if any) and approaches do you use?

    Read the article

  • Does what I'm doing make me a software engineer? [closed]

    - by user1803460
    Possible Duplicate: What are the key differences between software engineers and programmers? I am a software company owner for 8 years now. After years of operation I figured out that all the while what I was doing was a software engineer's job. There are several questions in my mind that I want to ask from you guys. I know that answers will be subjective. As a software engineer, do you really need to be a seasoned programmer? Is it true that software engineers don't code but just make diagrams, functional specs. and othe related documents? I also noticed that there are no SE standards or board exams to pass and its really a dynamic and situational job. So basically I can just proclaim myself as a software engineer based on experience and product?

    Read the article

  • What's a reliable and practical way to protect software with a user license ?

    - by Frank
    I know software companies use licenses to protect their softwares, but I also know there are keygen programs to bypass them. I'm a Java developer, if I put my program online for sale, what's a reliable and practical way to protect it ? How about something like this, would it work ? <1> I use ProGuard to protect the source code. <2> Sign the executable Jar file. <3> Since my Java program only need to work on PC [I need to use JDIC in it], I wrap the final executable Jar into an .exe file which makes it harder to decompile. <4> When a user first downloads and runs my app, it checks for a Pass file on his PC. <5> If the Pass file doesn't exist, run the app in demo mode, exits in 5 minutes. <6> When demo exits a panel opens with a "Buy Now" button. This demo mode repeats forever unless step <7> happens. <7> If user clicks the "Buy Now" button, he fills out a detailed form [name, phone, email ...], presses a "Verify Info" button to save the form to a Pass file, leaving license Key # field empty in this newly generated Pass file. <8> Pressing "Verify Info" button will take him to a html form pre-filled with his info to verify what he is buying, also hidden in the form's input filed is a license Key number. He can now press a "Pay Now" button to goto Paypal to finish the process. <9> The hidden license Key # will be passed to Paypal as product Id info and emailed to me. <10> After I got the payment and Paypal email, I'll add the license Key # to a valid license Key list, and put it on my site, only I know the url. The list is updated hourly. <11> Few hours later when the user runs the app again, it can find the Pass file on his PC, but the license Key # value is empty, so it goes to the valid list url to see if its license Key # is on the list, if so, write the license Key # into the Pass file, and the next time it starts again, it will find the valid license Key # and start in purchased mode without exiting in 5 minutes. <12> If it can't find its license Key # on the list from my url, run in demo mode. <13> In order to prevent a user from copying and using another paid user's valid Pass file, the license Key # is unique to each PC [I'm trying to find how], so a valid Pass file only works on one PC. Only after a user has paid will Paypal email me the valid license Key # with his payment. <14> The Id checking goes like this : Use the CPU ID : "CPU_01-02-ABC" for example, encrypt it to the result ID : "XeR5TY67rgf", and compare it to the list on my url, if "XeR5TY67rgf" is not on my valid user list, run in demo mode. If it exists write "XeR5TY67rgf" into the Pass File license field. In order to get a unique license Key, can I use his PC's CPU Id ? Or something unique and useful [ relatively less likely to change ]. If so let's say this CPU ID is "CPU_01-02-ABC", I can encrypt it to something like "XeR5TY67rgf", and pass it to Paypal as product Id in the hidden html form field, then I'll get it from Paypal's email notification, and add it to the valid license Key # list on the url. So, even if a hacker knows it uses CPU Id, he can't write it into the Pass file field, because only encrypted Ids are valid Ids. And only my program knows how to generate the encrypted Ids. And even if another hacker knows the encrypted Id is hidden in the html form input field, as long as it's not on my url list, it's still invalid. Can anyone find any flaw in the above system ? Is it practical ? And most importantly how do I get hold of this unique ID that can represent a user's PC ? Frank

    Read the article

  • Software for analyzing IIS logs?

    - by AngryHacker
    I have a ton of IIS monthly logs. Can someone recommend software that can help me analyze them (e.g. visitors, os/browser statistics, all the standard stuff)? I'd like a piece of software that does not require me to setup a server or anything complicated. Simply point it to a file or folder and it'll do the rest. Back in the day (90s) there was something like that, but I can't find it now. Thanks

    Read the article

  • Identify remote desktop client software and OS when user logs into Windows 2008 R2 Remote Desktop

    - by georged
    We would like to detect what devices & what programs users are using to connect to the Windows 2008 R2 Remote Desktop. In particular, we would like to have an ability to detect the remote devices such as iPads, iPhones & Androids, identify the software used and allow these connections only for certain users based on combination of the client OS + software. If it can be done in powershell to be run as part of the logon script, that'd be ideal.

    Read the article

  • Local area network computer to computer backup software

    - by thegreyspot
    Hi! I would like to back up my other computers on my local home network to my computer. What software would you suggest? I liked crashplan, however their confusing UI, and its ability not to sync, turned me away. But it has the right idea. A bonus would be if the software did not compile everything in to one file, but its ok if it does. Also I would like it to be free

    Read the article

  • Software for measuring internet traffic?

    - by Lachlan McDonald
    I'm interested in finding a free piece of software for Windows XP & 7 that allows us to measure both incoming and outgoing internet traffic, but not traffic between users of the local network. I live in a shared household with three others, and we're interested to see which of us is using the largest amount of our monthly internet quota. We're all happy to install the necessary software. Any suggestions?

    Read the article

  • Communication software wanted: email, sms, IM, phone calls [closed]

    - by user63835
    I am searching for a software solution that integrates / unifies my communication. I use email, instant messaging, SMS and phone. I would like to get all emails, SMS, instant messaging dialogs and meta-data about phone calls into one application. Important is that I can access all past communication with one application. There should be a global address-book to map the communication data to persons or organizations. I want all the communication data in one place to access and backup it easily. The software solution is not required to be multi-user application or server application. It is just for one user (me) only, but server or multi-user applications are not excluded. I may run it on a server hardware. It should run on Linux (Lubuntu / Ubuntu prefered). Free and OpenSource software is prefered. It would be nice if I could perform new communication (like writing a new email, sms, etc.) with one application, but that is not a must have requirement. I could also work with different applications dedicated for different types of communication like IM-application for IM and email-application for email, if all that communication data from the specialized applications will be delivered to one single place where I can access and backup it. I have an android phone and currently I am using Google contacts as the address-book. In the long term this may change, to get back the control over my data. I did some Internet search but did not find a nice solution, yet. If I am looking for unified messaging and unified communication, am I on the right track? The current Thunderbird version has IM functionality integrated. Did not try it, yet. For SMS it may be possible to use an app to send every SMS (incoming and outgoing) as an email, but I am not sure if those SMS-emails can be mapped to an address-book contact. I don't remember exactly, but isn't there a Google android app (I think Google voice) integrating SMS into google services? But in Germany this function has not been released, yet. Maybe a groupware solution would solve the requirements, but I don't have much experience with it. As communication possibilites are groing, I am woundering that there seems to be such a big gap of solutions. I can't believe I am the only one who would like solution, better integrating all the communication channels more easily. If you know a software solution that solves these requirements (partly) I would be glad if you tell me about it. Thanks in advance.

    Read the article

  • Software load balancing fail-over vs hardware

    - by SmartLemon
    Please correct me, but my understanding is that with software load balancing a service must be run on each server while there is one DS that notifies the other servers that a server has gone down and that they should consume that servers load. With hardware load balancing what happens in a fail-over? Could someone explain? Is there advantages with using hardware load balancing when it comes to fail-over, or is there advantages with software? Or do they both have their pros and cons?

    Read the article

  • Bluetooth software suite

    - by Josef Sábl
    I need something to backup my mobile phone contact book, send SMS etc. over bluetooth, I tried Soleil software but it does not work on my PC. Is there any other similar software? I have Windows 7. Thanks.

    Read the article

  • Free CD burning software for Windows?

    - by MiffTheFox
    I need to burn CDs (maybe DVDs too) from images (both bin/cue and iso format), and also from files. What is a good software to handle this? Note that I don't have the software that may have come with the drive, but I'm assuming it works because I can burn files with Explorer. I just need something that can handle images too.

    Read the article

  • Thesaurus software needed for Windows XP

    - by andygrunt
    Can anyone recommend (free) Thesaurus software for Windows XP (that isn't WordWeb)? It has to work with British English. I want to install standalone software that gives me easy access (right click, keyboard shortcut or something) to alternatives to the selected word when I'm writing, whether it's an email, a text doc in notepad, on an internet forum or whatever. I've tried WordWeb but found it pretty horrible - I want something that acts more like the Thesaurus in MS Word, giving a dozen or so decent alternatives to the selected word.

    Read the article

  • Should I install software on a "SAN"

    - by am2605
    Hi, I need to set up ColdFusion 9 on a ubuntu server that has a SAN disk mounted. Is it appropriate to install the CF server software on this disk? I don't really understand the ins and outs of what a SAN is, so I am not sure if the intention is for me to solely install web content on it or whether the server software itself should go here too. Any advice would be extremeness welcome. Many thanks, Andrew.

    Read the article

  • Sharing software updates between macs without OS X Server

    - by Frost
    Is there any way to (manually or automatically) share downloaded software updates between macs? Edit: The thinking is that I have one mac update itself using Software Update, and then somehow share the downloaded updates with other macs. For example, I have a mac pro and a mac mini on my local network. I'd like to download the Mac OS X 10.6.5 update only once, instead of having to download it separately for each mac.

    Read the article

  • Software for cutting/resizing/joining videos?

    - by eSKay
    hi! I need a free software for Windows Vista that can split my videos, merge them and resize the resolution. These are the features I need. Features like conversion from one format to another would be useful but not necessary. Any cool small piece of software that comes to mind??

    Read the article

  • Software to capture the packets in an MPEG Transport Stream

    - by Crippledsmurf
    I have a DVB-T capture card and would like to capture the packets from the MPEG stream it receives so i can analyse them just for a bit of fun and learning I've googled and found a lot of converters and software to capture the video from these streams but very little in the area of capturing raw data from a stream. What software exists that can capture and dump the MPEG stream from a tuner?

    Read the article

  • Is free security software as good as paid security software?

    - by Tester101
    I mostly use free security solutions to protect my home PC, but I wonder if I would get better protection from a paid solution. I prefer the free software, since I can have multiple applications protecting against different threats. With paid software I feel like I have to choose just one, and hope it can protect against everything. Is it worth it to pay for security when there are free options?

    Read the article

< Previous Page | 74 75 76 77 78 79 80 81 82 83 84 85  | Next Page >