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• Programming in R help

  - by mary

  I needed help in converting the temperature from Farenheit to Celsius. Below are several attempts and each of these fails. I have ran the following below and need help in saying what error message is created by: a) (temp -32) Can you please let me know the error message in a comment, and what it means and how to directly relate the wording of the error message with the problem you find in the expression. likewise for: b) (temp - 32)5/9 don't know the erorr on this one c) 5/9(temp - 32) need an asterisk, but not specific enough d) [temp - 32]5/9 I know braces is off.

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• Do input template languages exist?

  - by marczellm

  When I have to create some textual representation of data, I can use a template language, so that my code does not have to worry about the structure of the output file - I can sometimes even write code that's independent of whether the output is XML, LaTeX or any other plain text. A simple example: Template (in separate file): <someXmlTag> $variableName </someXmlTag> Code: Template(temstring).substitute(variableName="value") Result (written to output file): <someXmlTag> value </someXmlTag> I want to do the same, but in the opposite direction. I have XML or plain text or whatever files to input. I want to describe the input structure in a separate file that looks like the input but has these variable declarations in it, and I want to handle it with code that's independent of the structure. Is there a library for this concept? (We usually handle XML input by using an XML parser library to describe the input structure in program code, handle plaintext input by writing regexes in code, and don't handle LaTeX input because LaTeX can't really be parsed.)

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• Is it OK to live without knowing how the program you created works?

  - by Kabumbus

  I mean, there are really useful libs that can solve problems when you are stuck and do not know how to solve this or that with your knowledge of programing language you use... For example, Boost for C++ or JQuery for JavaScript or Spring for Java... They solve problems in seconds and you do not really care how they did it (despite that they are written in the very same language you are programming in)... So I wonder am I alone use libs not being capable to write solutions for my problems from scratch or its standard practice?

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• Interest in Hadoop [on hold]

  - by pradeep

  I am a tech guy with around 7 yrs in IT and i basically work on LAMP technology. From past few months i have gained interest in hadoop. But i am confused on few points Is it worth investing time and money for learning hadoop? Is hadoop gonna stay for long or even big data concept gonna stay for long? Does learning and working hadoop take care of my compensation part? I have no idea about java. Is java a mandate for Hadoop. I have read answers where they say both.

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• Co-worker renamed all of my queries

  - by anon

  I don't know if I should be very irritated or what. I single handedly built over 300 queries for a large database, and developed a naming convention so I could find them later. No one else in my office even knows how to build a query, but I came in yesterday to find that all of them had been renamed. I am now having a very hard time finding things, and I am trying to figure out what to do. I spoke with the person responsible, and she just downplayed the whole thing. She said she renamed them so she can find them more easily. Unfortunately, I am the only one who knows how to build, edit, and maintain them, and the only reason she needed to find them was to test the queries. The new naming convention doesn't make sense at all, and I feel like we have taken a backwards step in the development process. What I'm trying to figure out is: 1) Am I overreacting? 2) What is the best way to handle this? I hate to mention this to my boss, but after speaking with my co-worker yesterday, I can already tell she feels like she did nothing wrong.

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• Languages and tools that are "portable" (work well from a USB storage drive) [closed]

  - by CodexArcanum

  I'm a huge fan of running programs from my portable hard drive: it means I always have my favorite tools no matter what computer I'm on. Sadly, development tools seem to be hard to get portable at times. I recently realized that the "portable" version of MinGW I was using off my USB drive was actually interfering with a locally installed version of MinGW, so sometimes even the tools you think are portable, aren't. So what are the best portable development tools that you've used? What runs well on a portable media, leaves the host machine clean, and generally makes moving around easier for you?

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• Interviewing consultants

  - by SkyOrg

  I've interviewed a number of candidates for salaried positions. I was recently informed that we are hiring a consultant for a few months to help us develop a native iPhone application. We are a .NET shop and none of us have any experience with iPhone development. I've also heard rumors that we are planning to hire more consultants in the future to help develop on other various platforms. How should I interview these consultants, considering that I have no experience with this type of development? Without regards to platform specific questions, what are the things I need to keep in mind when interviewing consultants? Normally when I interview candidates, I'll ask questions that I know the answer to. I would never ask a candidate something that I don't know how to answer. Since this is a different situation, what do I need to ask in order to make sure they are subject matter experts in their respective fields? Is it appropriate to ask specific questions that we'll need to eventually solve during the interview?

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• Should I use events in this case?

  - by joon

  I'm creating a video player, like a custom YouTube player. All of the GUI elements (progress bar, video player, play button, ...) are different classes, but I obviously need them to communicate. When the progress bar is clicked, or the slider is moved, it needs to send a "seek(x)" command to the video player. Similarly, the video player needs to update the progressbar every frame. Currently I'm doing this by having almost all elements have a link to each other. So when I create the progress bar, I'm telling it where the video player is. But after a while this becomes more and more complicated, and I'm wondering if events would be a better way to do this. Or a main controller class that has all the connections. What should I do?

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• Any good reason to open files in text mode?

  - by Tinctorius

  (Almost-)POSIX-compliant operating systems and Windows are known to distinguish between 'binary mode' and 'text mode' file I/O. While the former mode doesn't transform any data between the actual file or stream and the application, the latter 'translates' the contents to some standard format in a platform-specific manner: line endings are transparently translated to '\n' in C, and some platforms (CP/M, DOS and Windows) cut off a file when a byte with value 0x1A is found. These transformations seem a little useless to me. People share files between computers with different operating systems. Text mode would cause some data to be handled differently across some platforms, so when this matters, one would probably use binary mode instead. As an example: while Windows uses the sequence CR LF to end a line in text mode, UNIX text mode will not treat CR as part of the line ending sequence. Applications would have to filter that noise themselves. Older Mac versions only use CR in text mode as line endings, so neither UNIX nor Windows would understand its files. If this matters, a portable application would probably implement the parsing by itself instead of using text mode. Implementing newline interpretation in the parser might also remove some overhead of using text mode, as buffers would need to be rewritten (and possibly resized) before returning to the application, while this may be less efficient than when it would happen in the application instead. So, my question is: is there any good reason to still rely on the host OS to translate line endings and file truncation?

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• MVC Design Pattern to Combine Multiple Models for use

  - by roverred

  In my design, I have multiple models and each model has a controller. I need to use all the models to process some operation. Most examples I see are pretty simple with 1 view, 1 controller, and 1 model. How would you get all these models together? Only ways I can think of are 1) Have a top-level controller which has a reference to every controller. Those controllers will have a getter/setter function for their model. Does this violate MVC because every controller should have a model? 2) Have an Intermediate class to combine every model into a one model. Then you create a controller for that new super model. Do you know of any better ideas? Thanks.

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• Why do exclusively outsourcing projects as a company?

  - by user19833

  A prospective employer told me they took a company level decision to only do outsourcing projects. I do not understand why did they take such a decision and the guy I talked to did not elaborate. He further said only that "their intention is to build software components". Since they are growing quite fast and reached around 300 employees, shouldn't they be at least open to the possibility of having a project of their own, maybe? All other companies I've had contact with were at least open to have one in the future.. I talked to a few of their employees and some are working in parallel on more than 2 outsourced projects (dividing time something like 4 + 4 hours / day). It seemed like a lot of projects with a period of a few months, maybe half an year come and go... Why would a company choose to provide only outsourcing services like that? How does it work to keep hundreds of people on outsourced projects with a seemingly high project turnover rate?

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• What to do if I hate C++ header files?

  - by BlaXpirit

  I was always confused about header files. They are so strange: you include .h file which doesn't include .cpp but .cpp are somehow compiled too. NOTE: I UNDERSTAND EVERYTHING ABOUT THE HEADERS, PLEASE DON'T TELL ME I'M STUPID OR SHOULD USE OTHER LANGUAGE Recently I joined a team project, and of course, both .h and .cpp are used. I understand that this is very important, but I can't live with copy-pasting every function declaration in each of multiple classes we have. How do I handle the 2-file convention efficiently? Are there any tools to help with that, or automatically change one file that looks like example below to .h and .cpp? (specifically for MS VC++ 2010) class A { ... Type f(Type a,Type b) { //implementation here, not in another file! } ... }; Type f(Type a) { //implementation here } ...

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• Confused about my future. Doubt about .Net or Java way.

  - by dotNET

  I'm very confused about choosing the programming langage to follow in the next step of my life. I'm right now so familiar with C++, VB.NET and PHP, but to jump to a higher level I must choose between JEE(JSP, Servlets, JSF, Spring, EJB, Struts, Hibernate,...) and .NET(ASP.NET, C#). Because I cant learn them at the same time. And you realize that, when I mentioned JEE a lot of things comes to the head. In my personnal experience I prefere the .NET, but Java seems to be a better choice. believe me, i'm not writing a subjective topic. I just want to know what must I follow to get succes in my life. The question here is : Is there any things that can be done with Java, and cannot be done with .NET. Is there any chances that I can follow the uncounted number of frameworks that are always in developpement. ... (also something not said) ?

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• MSVC++ Resource (.rc) files tutorial? [closed]

  - by Serge

  I'm looking for a good tutorial for making resource files (*.rc) in MSVC++. I've been googling, and nothing has been useful in the slightest. What I'm looking for is a guide for how to actually write, manually, a *.rc file. Anything I have found so far, especially on MSDN, has only been about how to use the Visual Studio menu options to let it create resources for you. I'm not interested in that. Anyone able to help?

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• Using T[1] instead of T for functions overloaded for T(&)[N]

  - by Abyx

  The asio::buffer function has (void*, size_t) and (PodType(&)[N]) overloads. I didn't want to write ugly C-style (&x, sizeof(x)) code, so I wrote this: SomePacket packet[1]; // SomePacket is POD read(socket, asio::buffer(packet)); foo = packet->foo; But that packet-> looks kinda weird - the packet is an array after all. (And packet[0]. doesn't look better.) Now, I think if it was a good idea to write such code. Maybe I should stick to unsafe C-style code with void* and sizeof? Upd: here is another example, for writing a packet: SomePacket packet[1]; // SomePacket is POD packet->id = SomePacket::ID; packet->foo = foo; write(socket, asio::buffer(packet));

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• MVVM and service pattern

  - by alfa-alfa

  I'm building a WPF application using the MVVM pattern. Right now, my viewmodels calls the service layer to retrieve models (how is not relevant to the viewmodel) and convert them to viewmodels. I'm using constructor injection to pass the service required to the viewmodel. It's easily testable and works well for viewmodels with few dependencies, but as soon as I try to create viewModels for complex models, I have a constructor with a LOT of services injected in it (one to retrieve each dependencies and a list of all available values to bind to an itemsSource for example). I'm wondering how to handle multiple services like that and still have a viewmodel that I can unit test easily. I'm thinking of a few solutions: Creating a services singleton (IServices) containing all the available services as interfaces. Example: Services.Current.XXXService.Retrieve(), Services.Current.YYYService.Retrieve(). That way, I don't have a huge constructor with a ton of services parameters in them. Creating a facade for the services used by the viewModel and passing this object in the ctor of my viewmodel. But then, I'll have to create a facade for each of my complexe viewmodels, and it might be a bit much... What do you think is the "right" way to implement this kind of architecture ?

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• What does well written, readable tests look like?

  - by Industrial

  Doing unit testing for the first time at a large scale, I find myself writing a lot of repetitive unit tests for my business logic. Sure, to create complete test suites I need to test all possibilities but readability feels compromised doing what I do - as shown in the psuedocode below. How would a well written, readable test suit look like? describe "UserEntity" -> it "valid name validates" ... it "invalid name doesnt validate" ... it "valid list of followers validate" ..

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• what to learn & practice to be a programmer (not for Job) [closed]

  - by Hanan N.

  I want to be able to write programs (tools) for my own needs, and I want to tell the computer what to do, not to be strict to what other's told it to do. I have a good knowledge of Linux & Windows, I am also have a bit of Python in my head, but I think that I need some guidance on what languages or practices to invest my time into in order to be able to tell the computer what to do. I know there is a lot of posts similar to what I am asking here, but there is a big difference and so I have opened this thread. My goal isn't to work at a company, so I don't need to learn how to work as a team, I don't need to learn as much how to maintain my code nor how to write it nice for others to understand (I know it is important but not for me). I don't want to learn it as a profession, but as a serious hobby (you can call it hacking as long as you know what cracking means), my end goal is to be able to understand other's people code, and to write my own code with a lot of deep knowledge of the ins and outs of the computer system in order to gain from it as much as I can. So in essence my questions are: How can I understand, in depth, computers, in order to exploit them as much as I can? What should I learn? Are there any books that I should read? Is it possible to do this, or do I have to learn every aspect of programming?

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• Should back end processes be included in use cases in requirements document?

  - by bizso09

  We're writing a requirements document for our client and need to include the use cases of the system. We're following this template: ID Description Actors Precondition Basic Steps Alternate Steps Exceptions Business validations/Rules Postconditions In the Basic Steps section, should we include steps that the system performs in the back end or should we only include steps that the user directly interacts with? Example: Basic Steps for Search 1: User goes to search page User enters term User presses search System matches search term with database entries System displays results vs Basic Steps for Search 2: User goes to search page User enters term User presses search System displays results

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• is requiring a video player download acceptable

  - by wantTheBest

  Our site currently is going to require our users to download a player to view videos they will want to view on our site. The videos get uploaded by users from various sources (smartphones in 3gp format for example). However most people have Flash on their machines. I am trying to 'make a gentle stand' and tell the team that requiring a download of a video player is not acceptable. My thinking is this: instead of allowing people to upload 3gp and other formats then re-serving the exact format on REQUESTs from our site's users we will instead use a video converter such as FFMpeg to convert every uploaded video to FLV for viewing on flash. so when a user requests to view one of the videos on our site -- boom they probably already have Flash installed so we just play the video in their Flash player. I feel serving up FLV flash video is best. Does it ring true that requiring, say, a 3gp player download just to view a video is the wrong approach?

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• 3d point cloud render from x,y,z 2d array with texture

  - by user1733628

  Need some direction on 3d point cloud display using OpenGL in c++ (vs2008). I am brand new to OpenGL and trying to do a 3d point cloud display with a texture. I have 3 2D arrays (each same size 1024x512) representing x,y,z of each point. I think I am on the right track with glBegin(GL_POLYGON); for(int i=0; i<1024; i++) { for(int j=0; j<512; j++) { glVertex3f(x[i][j], y[i][j], z[i][j]); } } glEnd(); Now this loads all the vertices in the buffer (I think) but from here I am not sure how to proceed. Or I am completely wrong here. Then I have another 2D array (same size) that contains color data (values from 0-255) that I want to use as texture on the 3D point cloud and display. I understand that this maybe a very basic OpenGL implementation for some but for me this is a huge learning curve. So any pointers, nudge or kick in the right direction will be appreciated.

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• Difference between Zend Framework 1.8 and 1.11 [closed]

  - by user985482

  Hi I have about 6 months of PHP experience and now I am thinking of starting of learning Zend Framework. I learn best usually from books and I noticed on amazon that the most recent release is for the version 1.8. Zend Framework 1.8 Web Application Development Since the curent version is 1.11 will this be a problem in the future? What is the difference beetween the versions. Can anyone recommend a more recent book for this framework?

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• Hosting a Small PHP/MySQL Project [closed]

  - by paulrehkugler

  I have a small PHP/MySQL project in the works and I'm looking for somewhere to host it. My criteria are: Ability to run PHP/MySQL (either natively, or contains the ability to install). Ability to manipulate the web server, so I can make pretty URLs. Not spammy (if you've ever looked for hosting, you know what I mean). Semi-professional - no ridiculous downtime or long response time. I obviously don't need anything spectacular (I'm not aiming to be the next Facebook) but something that doesn't seem cheap. Reasonably priced - obviously this is a side project for fun so I'm not planning on making or dispensing any sort of "serious" revenue.

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• Improving python code

  - by cobie

  I just answered the question on project euler about finding circular primes below 1 million using python. My solution is below. I was able to reduce the running time of the solution from 9 seconds to about 3 seconds. I would like to see what else can be done to the code to reduce its running time further. This is strictly for educational purposes and for fun. import math import time def getPrimes(n): """returns set of all primes below n""" non_primes = [j for j in range(4, n, 2)] # 2 covers all even numbers for i in range(3, n, 2): non_primes.extend([j for j in range(i*2, n, i)]) return set([i for i in range(2, n)]) - set(non_primes) def getCircularPrimes(n): primes = getPrimes(n) is_circ = [] for prime in primes: prime_str = str(prime) iter_count = len(prime_str) - 1 rotated_num = [] while iter_count > 0: prime_str = prime_str[1:] + prime_str[:1] rotated_num.append(int(prime_str)) iter_count -= 1 if primes >= set(rotated_num): is_circ.append(prime) return len(is_circ)

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• Preparing for Interview: I feel like, I wanna start coding all data structures again.... Is it a right way to start?

  - by howtechstuffworks

  I started preparing for my interview. I will be graduating this May. Right now, I am doing an internship in an product based company, so I did my fair share of preparation. The thing is, whenever, I try to do something, I always think that I should start everything from page 1. It is sometimes not at all helpful.... For example, reading a programming book from page 1 is not going to helpful, as I never completed one and always stopped half way through or rushed through towards deadlines. I am facing a similar situation now. I feel like, I wanna start coding all data structures from first(I attempted and finished atleast 6-7 last fall, preparing for interview). Now I feel like, I wanna code everything from first, instead of attempting something new.... I am not quite sure, what this is, but this is the way I have been..... LOL

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