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  • Project Manager that wants to lock in time estimate with a signed contract

    - by sunpech
    At a previous employment, a project manager (PM) wasn't satisfied with the delivery time of the code on a project I was on. I was told by my project lead that that the PM was considering having me sign a contract to lock-in my time estimates I gave for tasks and delivery dates. The situation on the project was that we were working with new technologies, codebase, coding standards, and very prone-to-change requirements. I was learning new things and applying them the best I could on requirements that kept on changing. The requirements throughout the iterations grew by 2-3 times, with my estimate-to-complete growing by roughly 5-8 times. The only things that didn't change were the estimates and delivery dates. Yes, I did end up missing most deadlines. And I was working on some very new technologies that no one else on the entire development team could really help out on because they wouldn't be familiar with it. At least not easily. It seemed to me then, that the PM wanted his numbers to add up-- and thus wanted me to sign a contract to "ensure" that I would always deliver working code on time. I suppose with a signed contract the PM could use it against me if I couldn't deliver on time. I believe what happened next was that other project managers and/or project leads defended me, and didn't let this happen. My question is, should this raise a red flag about the manager? Is it common practice for a manager to lock-in time estimates of a software developer with a signed contract? Or in this case, try to. Please note, I was a full time employee, not an independent consultant. Update: I want to add that I did give new estimates weekly, but it seems the original estimates and delivery dates were what the PM was fixated on.

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  • How can Swift be so much faster than Objective-C?

    - by Yellow
    Apple launched its new programming language Swift today. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their slides, of a comparison of those three languages performing some complex object sort: There was an even more incredible graph about a performance comparison working on some encryption algorithm. Obviously this is a marketing talk, and they didn't go into detail on how this was implemented in each. I leaves me wondering though: how can a new programming language be so much faster? In this example, surely you just have a bad Objective-C compiler or you're doing something in a less efficient way? How else would you explain a 40% performance increase? I understand that garbage collection/automated reference control might produce some additional overhead, but this much?

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  • CPU Architecture and floating-point math

    - by Jo-Herman Haugholt
    I'm trying to wrap my head around some details about how floating point math is performed on the CPU, trying to better understand what data types to use etc. I think I have a fairly good understanding of how integer math is performed. If I've understood correctly, and disregarding SIMD, a 32-bit CPU will generally perform integer math at at least 32-bit precision etc. Is it correct that floating-point math is dependent on the presence of a FPU? And that the FPU on the x86 is 80-bit, so floating point math is performed at this precision unless using SIMD? What about ARM?

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  • WPF TextBlock refresh in real time

    - by TheOnlyBrien
    I'm new to C#, in fact, this is one of the first projects I've tried to start on my own. I am curious why the TextBlock will not refresh with the following code? The WPF window does not even show up when I add the "while" loop to the code. I just want this to have a real time display of the days since I was born. Please help me out or give me constructive direction. using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace daysAliveWPF { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); DateTime myBirthday = new DateTime(1984, 01, 19); while (true) { TimeSpan daysAlive = DateTime.Now.Subtract(myBirthday); MyTextBlock.Text = daysAlive.TotalDays.ToString(); } } } } Similar code has worked in a Console Window application, so I don't understand what's going on here. Console Application code snip that did work is: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace DisplayRealTime { class Program { static void Main(string[] args) { DateTime myBirthday = new DateTime(1984, 06, 19); while (true) { TimeSpan daysAlive = DateTime.Now.Subtract(myBirthday); Console.Write("\rTotal Days Alive: {0}", daysAlive.TotalDays.ToString(".#####")); } } } } Thank you!

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  • scrapy cannot find div on this website [on hold]

    - by Jaspal Singh Rathour
    I am very new at this and have been trying to get my head around my first selector can somebody help? i am trying to extract data from page http://groceries.asda.com/asda-webstore/landing/home.shtml?cmpid=ahc--ghs-d1--asdacom-dsk-_-hp#/shelf/1215337195041/1/so_false all the info under div class = listing clearfix shelfListing but i cant seem to figure out how to format response.xpath(). I have managed to launch scrapy console but no matter what I type in response.xpath() i cant seem to select the right node. I know it works because when I type response.xpath('//div[@class="container"]') I get a response but don't know how to navigate to the listsing cleardix shelflisting. I am hoping that once i get this bit I can continue working my way through the spider. Thank you in advance! PS I wonder if it is not possible to scan this site - is it possible for the owners to block spiders?

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  • 32-bit / 64-bit processors - what is that feature officially called?

    - by JW01
    I see talk of CPU's being either 32-bit or 64-bit processors. Information which is often required on download pages But what is that feature officially called. i.e What's the inverse of saying "I have a 64-bit processor"? I want to say: The ??? of my processor is 64 bit What is the correct term to use for ??? I have looked at a random product on the Intel site and I suspect the correct word for this is "Instruction Set", but I'm not sure.

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  • Android SDK vs NDK in oppurtunities and career scope

    - by Gopal S Akshintala
    Hi I am very much interested in Android Mobile Developement and I am equally comfortable with Java and C/C++. I would like to build my career in Android. So I am confused on to which way to go, wheather as Android SDK developer or NDK developer. Please advice me pros n cons of both and also the career scope and oppurtunities in both(With factors like excitement in Job, Payroll, competetion, Openings in Job Market, career growth etc).Thanks...:)

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  • How can I make my FireFox Browser AddOn Backwards Compatible?

    - by bwheeler96
    I'm making a firefox browser add-on, and I just got all of the code working fine, but it will only install in FireFox 16, and I want it to be compatible at least from 10+, has anyone dealt with this issue? I have my package.json pointing to my install.rdf, and my install.rdf clearly states target applications. Is there any additional setup I need? here is my package.json { "name": "firefox-ext", "license": "MPL 2.0", "author": "", "version": "0.1", "fullName": "firefox-ext", "id": "jid1-AMCw25iQJof53w", "description": "a basic add-on" } and here is my install.rdf. <?xml version="1.0"?> <RDF xmlns="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:em="http://www.mozilla.org/2004/em-rdf#"> <Description about="urn:mozilla:install-manifest"> <em:id>jid1-AMCw25iQJof53w</em:id> <em:name>Generic App</em:name> <em:version>1.0</em:version> <em:type>2</em:type> <em:creator>Brian Wheeler</em:creator> <em:description>Good Stuff</em:description> <em:targetApplication> <Description> <em:id>{ec8030f7-c20a-464f-9b0e-13a3a9e97384}</em:id> <em:minVersion>1.0</em:minVersion> <em:maxVersion>19.0</em:maxVersion> </Description> </em:targetApplication> </Description> </RDF> I'm using the CFX CLI Tools to make this, so everything has been built and tested with cfx init, cfx run, and cfx xpi I just can't figure out compatibility with anything other than 16. Also, major bonus points if someone could explain the advantages of a rapid release cycle, because it really seems to have shot 3rd party Mozilla developers in the foot in terms of software compatibility. Thanks, -Brian

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  • Is it reasonable to expect knowing the whole stack bottom up?

    - by Vaibhav Garg
    I am an Sr. developer/architect/Product Manager for embedded systems. The systems that I have had experience with have typically been small to medium size codebases - typically close to 25-30K LOC in C, using 8-16 and 32 bit low end microcontrollers. The systems have been entirely bootstrapped by our team - meaning right from the start-up code to the end application code has either been written by the team, or at the very least, is thoroughly understood and maintained by us. Now, if we were to start developing more complex systems with complex peripherals, such as USB OTG et al. (think, low end cell phones), there are libraries and stacks available commercially and from chip vendors that reduce the task to just calling the right APIs and being able to use those peripherals. Now, from a habit point of view, this does not give me and the team a comfortable feeling, not being able to comprehend the entire code tree, with virtual black boxes at the lower layers. Is it reasonable to devote, and reserve, time getting into the details of how the APIs are implemented, assuming that the same would also entail getting into details of relevant standards (again, for USB as an example)? Or, alternatively, should a thorough understanding of the top level usage of the APIs be sufficient? This of course assumes that the source codes to all libraries are available, which they are, in almost all cases. Edit: In partial response to @Abhi Beckert, the documentation is refreshingly very comprehensive and meticulously maintained, AFAIK and been able to judge. I have not had a long experience with the same.

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  • Is software development an engineering discipline?

    - by Vaibhav Garg
    Can software development be considered engineering? If no, what are the things that it lacks in order to be qualified as an engineering discipline? Related to this is this question on Stack Overflow about the difference between a programmer and a software engineer. There is the Software Engineering Institute at Carnigie Mellon University that prescribes and maintains the CMMI standards. Is this something that will turn development into engineering?

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  • Junior developer support

    - by lady_killer
    I am a junior developer in my first work experience after university. I joined the company as PHP developer but I ended up developing using C# and ASP.NET. Right from the start I did not receive any training in C# and I was assigned with ASP projects with quite tight deadlines scoped by Senior developers. The few project hand overs I had from other developers were brief and it looked like I had to discover the system myself, in really short time. This is my first job as web developer and I wonder whether it is normal not to have a kind of mentor to show me how to do things, especially because I am completely new to the technology. Also, do you have idea how to tackle this? As you can imagine, it gets really frustrating! Thank you!

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  • Obtaining Embedded Linux Experience

    - by Thomas Matthews
    As an embedded firmware developer, I have used operating systems such as WinCE, Nucleus, ThreadX, VRTX and some background loops. There are more opportunities for me if I had Linux OS experience, or perhaps some certification. In my research, the only way to get Linux experience is to have your company move to a Linux OS. All the recruiters and HR folks won't let you in the door unless you have Linux experience. I haven't found any Universities that teach Linux. Recruiters and HR want some tangible proof (starting up your own Ubuntu box or playing with it doesn't count). So, how does one get into the area of Embedded Linux without Linux experience (I have Unix and Cygwin experience, but not Linux)?

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  • Web development starting a career [closed]

    - by user985482
    Hi I am in the 3rd and last year at college of informatics and I am interested to follow a career in web development when I finish(2 more months). From what I understand this days to get hired you need to be able to know a variety of technologies at least that is the case in Romania.Most of the jobs I have seen even at entry level asks you to know the following: HTML/CSS Javascript , a framework preferable jQuery , Ajax a server side language in my case PHP and a framework SQL and an RDBMS in my case MySql a CMS in my case Wordpress My question is how well should me or anyone looking to get hired as a web developer for there first job should we know this technologies in order to get hired and what else should we aim to learn to have a better chance of getting hired. I don't know if the question is right for this forum but I believe that this could help many of the students and anyone who is taking an interest in web development to know what they should expect from there employers when they try to find work.

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  • How to interview my future team leader?

    - by Stormenet
    Our current team leader is quitting his job (starting his own company) and thus we are searching for a new team leader. It's a small team of 4 people (Team leader included). Since it's a small team we expect the team leader not to only manage us but also do some coding. Because of this I convinced the R&D manager to let me have a say in this so that I can evaluate his technical skills and managing skills. I have little experience interviewing people let alone my future Team leader. What I search in a team leader is someone who isn't running a dictatorship but someone that when there are issues there is a discussion about it and we take everyone on the same line. What are the things I should not forget to ask and what are the skills I should find in that person?

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  • A talk about observer pattern

    - by Martin
    As part of a university course I'm taking, I have to hold a 10 minute talk about the observer pattern. So far these are my points: What is it? (defenition) Polling is an alternative Polling VS Observer When Observer is better When Polling is better (taken from here) A statement that Mediator pattern is worth checking out. (I won't have time to cover it in 10 minutes) I would be happy to hear about: Any suggestions to add something? Another alternative (if exists)

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  • Continuous Integration using Docker

    - by Leon Mergen
    One of the main advantages of Docker is the isolated environment it brings, and I want to leverage that advantage in my continuous integration workflow. A "normal" CI workflow goes something like this: Poll repository for changes Pull from repository Install dependencies Run tests In a Dockerized workflow, it would be something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Run tests Kill docker container My problem is with the "run tests" step: since Docker is an isolated environment, intuitively I would like to treat it as one; this means the preferred method of communication are sockets. However, this only works well in certain situations (a webapp, for example). When testing different kind of services (for example, a background service that only communicated with a database), a different approach would be required. What is the best way to approach this problem? Is it a problem with my application's design, and should I design it in a more TDD, service-oriented way that always listens on some socket? Or should I just give up on isolation, and do something like this: Poll repository for changes Pull from repository Build docker image Run docker image as container Open SSH session into container Run tests Kill docker container SSH'ing into the container seems like an ugly solution to me, since it requires deep knowledge of the contents of the container, and thus break the isolation. I would love to hear SO's different approaches to this problem.

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  • What are the best resources for learning about concurrency and multi-threaded applications?

    - by Zepee
    I realised I have a massive knowledge gap when it comes to multi-threaded applications and concurrent programming. I've covered some basics in the past, but most of it seems to be gone from my mind, and it is definitely a field that I want, and need, to be more knowledgeable about. What are the best resources for learning about building concurrent applications? I'm a very practical oriented person, so if said book contains concrete examples the better, but I'm open to suggestions. I personally prefer to work in pseudocode or C++, and a slant toward game development would be best, but not required.

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  • A design pattern for data binding an object (with subclasses) to asp.net user control

    - by Rohith Nair
    I have an abstract class called Address and I am deriving three classes ; HomeAddress, Work Address, NextOfKin address. My idea is to bind this to a usercontrol and based on the type of Address it should bind properly to the ASP.NET user control. My idea is the user control doesn't know which address it is going to present and based on the type it will parse accordingly. How can I design such a setup, based on the fact that, the user control can take any type of address and bind accordingly. I know of one method like :- Declare class objects for all the three types (Home,Work,NextOfKin). Declare an enum to hold these types and based on the type of this enum passed to user control, instantiate the appropriate object based on setter injection. As a part of my generic design, I just created a class structure like this :- I know I am missing a lot of pieces in design. Can anybody give me an idea of how to approach this in proper way.

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  • Improving performance of fuzzy string matching against a dictionary [closed]

    - by Nathan Harmston
    Hi, So I'm currently working for with using SecondString for fuzzy string matching, where I have a large dictionary to compare to (with each entry in the dictionary has an associated non-unique identifier). I am currently using a hashMap to store this dictionary. When I want to do fuzzy string matching, I first check to see if the string is in the hashMap and then I iterate through all of the other potential keys, calculating the string similarity and storing the k,v pair/s with the highest similarity. Depending on which dictionary I am using this can take a long time ( 12330 - 1800035 entries ). Is there any way to speed this up or make it faster? I am currently writing a memoization function/table as a way of speeding this up, but can anyone else think of a better way to improve the speed of this? Maybe a different structure or something else I'm missing. Many thanks in advance, Nathan

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  • Can resizing images with css be good?

    - by Echo
    After reading Is CSS resizing of images still a bad idea?, I thought of a similar question. (too similar? should this be closed?) Lets say you need to use 10 different product image sizes throughout your website and you have 20k-30k different product images, should you use 10 different files for each image size? or maybe 5 different files and use css to resize the other 5? Would there ever be combination that would be good? Or should you always make separate image files? If you use css to resize them, you will save on storage (in GBs) but you will have slight increase in bandwidth and slower loading images(but if images are cached, and you show both sizes of the image would you use less bandwidth and have faster loads?) (But of course you wouldn't want to use css to resize images for mobile sites.)

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  • Best Books of C

    - by Patrick
    Hi, I realy want to get high skills in C programming and I know that the best and only way is hard work and lots of practice. though I found so many tutorials and books available on the net about learning the C language. I'm just looking for one or two good books in C that I can learn from and get high skills in C. Anyone knows such a great book/books for C programming pls? (sorry for replication if the question exists already in the forum) Regards!

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  • Low level Linux graphics

    - by math4tots
    For educational purposes, I'd like to write an application on a Linux environment that can process keyboard events and draw graphics without huge dependencies like X or SDL. I presume that this must be possible, because X and SDL are just programs themselves, so they must rely on other methods inherent to the environment. Is this understanding correct? If so, where might I learn to write such a program? My limited experience tells me that it would involve making calls to the kernel, and/or writing to special files; however, I haven't been able to find any tutorials on the matter (I am not even sure what to Google). Also, in case it is relevant, I am running Debian Squeeze on Virtualbox. I have used a netinst cd without networking, so there isn't much installed on it currently. I will install gcc, but I am hoping I can get by with nothing more.

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  • Questioning pythonic type checking

    - by Pace
    I've seen countless times the following approach suggested for "taking in a collection of objects and doing X if X is a Y and ignoring the object otherwise" def quackAllDucks(ducks): for duck in ducks: try: duck.quack("QUACK") except AttributeError: #Not a duck, can't quack, don't worry about it pass The alternative implementation below always gets flak for the performance hit caused by type checking def quackAllDucks(ducks): for duck in ducks: if hasattr(duck,"quack"): duck.quack("QUACK") However, it seems to me that in 99% of scenarios you would want to use the second solution because of the following: If the user gets the parameters wrong then they will not be treated like a duck and there will be no indication. A lot of time will be wasted debugging why there is no quacking going on until the user finally realizes his silly mistake. The second solution would throw a stack trace as soon the user tried to quack. If the user has any bugs in their quack() method which cause an AttributeError then those bugs will be silently swallowed. Once again time will be wasted digging for the bug when the second solution would simply give a stack trace showing the immediate issue. In fact, it seems to me that the only time you would ever want to use the first method is when: The block of code in question is in an extremely performance critical section of your application. Following the principal of "avoid premature optimization" you would only realize this of course, after you had implemented the safer approach and found it to be a bottleneck. There are many types of quacking objects out there and you are only interested in quacking objects that quack with a very specific set of arguments (this seems to be a very rare case to me). Given this, why is it that so many people prefer the first approach over the second approach? What is it that I am missing? Also, I realize there are other solutions (such as using abcs) but these are the two solutions I seem to see most often for the basic case.

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  • Roo gem .xlsx files performance problems [closed]

    - by alvaritogf
    I am getting unacceptable performace problems by using the roo gem for reading a file by using XLSX or XLS library from this gem. Someone may suggest me an alternative about how to parse an .XLSX file? parsed_file = Excel.new(filename,false, :ignore) if (file_format.upcase == "XLS") parsed_file = Excelx.new(filename,false, :ignore) if (file_format.upcase == "XLSX") raise t "#{filename} is not an Excel file!" if (!parsed_file) parsed_file.default_sheet = parsed_file.sheets[0]#'Sheet2'#oo.sheets[1] first_row = parsed_file.first_row last_row = parsed_file.last_row first_column = parsed_file.first_column last_column = parsed_file.last_column #logger.info "#### Total Rows:#{last_row}, first_row:#{first_row}, last_row:#{last_row}, first_column:#{first_column}, last_column:#{last_column}" first_row.upto(last_row) do |current_line| # Stuff .... end Thanks

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  • Is there a Javascript library for creating vintage photos?

    - by Nguyen Thanh Tu
    I'm working on a Canvas object in HTML5, and I am attempting to make some photos look "better". I tried VintageJS, an existing photo-retouching Javascript library, and Picozu, a web application cloning some Adobe Photoshop functionalities, but I'm still not happy. Can you help me with an algorithm or point to an existing Javascript library that would allow me to make my photos look like the following example? http://i46.photobucket.com/albums/f137/thanhtu_zx/Untitled-1.jpg

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