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  • What Math topics & resources to consider as beginner to indulge the book - Introduction to Algorithm

    - by sector7
    I'm a programmer who's beginning to appreciate the knowledge & usability of Algorithms in my work as I move forward with my skill-set. I don't want to take the short path by learning how to apply algorithms "as-is" but would rather like to know the foundation and fundamentals behind them. For that I need Math, at which I'm pretty "basic". I'm considering getting tuition's for that. What I would like is to have a concise syllabus/set of topics/book which I could hand over to my math tutor to get started. HIGHLY DESIRED: one book. the silver bullet. (fingers crossed!) PS: I've got some leads but want to hear you guys/gurus out: Discrete Math, Combinatorics, Graph theory, Calculus, Linear Algebra, and Number Theory. Looking forward to your answers. Thanks!

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  • How can I use && in if in Ruby on Rails?

    - by Angela
    I tried the following && conditional for my if statement and I get a "bad range" error: <% if (from_today(contact, call.days) == 0..7) && (show_status(contact, call) == 'no status') %> Why and how can I fix it? The only other way I could do it was to have a second nested if statement and break it apart...not pretty :(

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  • Input field name starts with a number

    - by fire
    I have an input field whose name is an MD5 string e.g.: <input type="hidden" name="7815696ecbf1c96e6894b779456d330e" value="1"> Now I understand that having a number as the first letter in an input field name is generally bad practice, but are there any side-effects to this such as a certain browser won't send it in the POST request?

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  • Prevent <img> tags in HTML from wrapping

    - by IL CARTOLAiO
    Hi all, I have a javascript that dynamically creates many <img> tags, and appends them to various divs. I want to prevent these images from wrapping; when the screen resolution is not enough to contain them the browser should create horizontal scroll-bars. Sorry for this bad English.

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  • What PHP function(s) can I use to perform operations on non-integer timestamps?

    - by stephenhay
    Disclaimer, I'm not a PHP programmer, so you might find this question trivial. That's why I'm asking you! I've got this kind of timestamp: 2010-05-10T22:00:00 (That's Y-m-d) I would like to subtract, say, 10 days (or months, whatever) from this, and have my result be in the same format, i.e. 2010-04-30T22:00:00. What function(s) do I need to do this in PHP? Note: I'm using this to do a computed field in Drupal. The result will be the date that an e-mail is sent. Bonus question: If 2010-05-10T22:00:00 means "May 10, 2010 at 10pm", is there a timestamp equivalent of "May 10, 2010 (all day)"? Thanks everyone.

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  • Resco: AdvancedList and PNG images

    - by Poku
    Hey When i use PNG images in my AdvancedList they are shown in very bad quality in the designer and when i deloy the project in the emulator the transparency disappears completely. Is Resco not cabable of showing png images or what is the problem here?

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  • Strings in ASP?

    - by TSL
    Hi All, I have some APSX code that I am trying to modify for a programmer that is out on medicaly leave. I am not an ASP guy, but rather C++ So what I want to do is delare a string, check the first 4 characters and if it is 'http' do something, if not, something else. Here is what I have: string strYT= Left(objFile, 4); if (strYT=="http") { pnlYT.Visible = true; pnlIntro.Visible = false; pnlVideo.Visible = false; } else { pnlYT.Visible = false; pnlIntro.Visible = false; pnlVideo.Visible = true; PrintText(objFile); } But I get errors like: Compiler Error Message: CS0103: The name 'Left' does not exist in the class or namespace 'ASP.zen_aspx' My googling turns up many examples of doing it just like this.....

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  • Trying to get the associated value from an Enum at runtime in Java

    - by devoured elysium
    I want to accomplish something like the following (my interest is in the toInt() method). Is there any native way to accomplish this? If not, how can I get the integer associated with an enum value (like in C#) ? enum Rate { VeryBad(1), Bad(2), Average(3), Good(4), Excellent(5); private int rate; private Rate(int rate) { this.rate = rate; } public int toInt() { return rate; } } Thanks

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  • What's this setting of MATLAB for(which is causing lots of troubles for lots of people)?

    - by Runner
    This setting in PATH: D:\MATLAB\R2007b\bin\win32 Here is a fresh bad affect by this setting for me: http://stackoverflow.com/questions/2712913/why-does-this-program-require-msvcr80-dll-and-whats-the-best-solution-for-this-k And here's an issue reported by another guy: http://groups.google.com/group/ggobi/browse_thread/thread/dacea0fa93dcaf75 What's that setting for and why it's causing so many problems?

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  • How to speed up a query?

    - by Soroush Khosravi
    I have a table that every request to the server, stores on it. For each request I will check that it is banned or not. For example it is a query: select * from requests where request_sessID = '4bc0331d983000902b4718c80f12e9b3' AND request_time > (UNIX_TIMESTAMP() - 3600) AND request_isEnable = 1 I also set the engine from InnoDB to MyISAM and row_format to Dynamic but nothing changed. My Hardware is very strong but it took about a minute to execute ! I am a programmer and newbie to mysql How can Speed Up this query? Thanks in Advance

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  • Beginner's Language app

    - by Eiseldora
    Hi I'm a techie with no programing experience. I know html and css, but I'd like to someday be able to make an app for my phone (I have an android) and possibly mobile websites. I made learning a programing language and creating a mobile app a goal for my job, and now my boss would like me to pick a programing language to learn. I found a free open course from MIT (http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00-introduction-to-computer-science-and-programming-fall-2008/) called introduction to computer science. In the course they teach python, but more importantly it seems they teach how to think like a programmer. When I told my boss about the free online course she didn't think that Python was an appropriate language for me to learn. She'd like me to learn a language that is more similar to one used to make Phone apps. Does anyone out there know a better language for me to pick up that would be similar to Android or iPhone's App language. Thank you

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  • C++: Pointers and scope

    - by oh boy
    int* test( ) { int a = 5; int* b = &a; return b; } Will the result of test be a bad pointer? As far as I know a should be deleted and then b would become a messed up pointer, right? How about more complicated things, not an int pointer but the same with a class with 20 members or so?

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  • [Android] Is disabling landscape mode unforgivable?

    - by Nicolas Raoul
    Our application could support landscape mode without any problem, but it is such a pain that we are thinking about forcing portrait mode. Question: Is it BAD? The main problem is that changing orientation generates random crashes on many screens. Avoiding those crashes would potentially allow us to spend more time on the core aspects of the app. Will the same crashes happen when users switch apps anyway? Also, are there landscape-oriented devices where our app will become useless?

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  • Best resources to learn JavaScript

    - by Tarks
    The question says it all really, I'm looking for book recommendations, video tutorials etc. I've been programming since I was about six so I don't need a book that spends 4 pages on for loops (thought that might be a Bad example in terms of javascript). Also I'm learning ASP.net at the moment so anything on interoperability features/issues would be welcome, though I'm guessing I just showed my ignorance with that question.

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  • How do I compare a string in an array to a string?

    - by user1641312
    EDIT: IT'S FIXED, THANKS FOR THE HELP! So basically I have an array of strings, a question and an answer public static String[][] triviaData = { {"Question2", "Answer1"}, {"Question2", "Answer2"}, {"Question3", "Answer3"}, }; And I am trying to make a method that validates an entered input, lets call the entered input enteredAnswer. enteredAnswer is stored as a String. I am trying to validate that the enteredAnswer is the same as the second index of the array. if (enteredAnswer.equalsIgnoreCase(triviaData[Config.CurrentQuestion][1])) { This is the code I tried, but I get the error "Cannot invoke equalsIgnoreCase(String) on the array type String[]" I am a beginner programmer so if you could help me out it would be highly appreciated. Thanks. enteredAnswer is stored as public String[] enteredAnswer;

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  • Bible reference books (PHP / MySQL / Unix)

    - by Josh K
    I'm looking for some nice heavy books to liter around my desk and make it look like I'm a hard core programmer. On the occasion that I might want to look something up they will also need to be useful dependable books. I'm looking for the equivalent bible in PHP, MySQL, and Unix. Should be laid out with some chapters I can actually read, along with having an in-depth reference to that particular subject. I know that the majority of this can be found on Google, but I would prefer it in book form.

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  • How does Array.ForEach() compare to standard for loop in C#?

    - by DaveN59
    I pine for the days when, as a C programmer, I could type: memset( byte_array, '0xFF' ); and get a byte array filled with 'FF' characters. So, I have been looking for a replacement for this: for (int i=0; i < byteArray.Length; i++) { byteArray[i] = 0xFF; } Lately, I have been using some of the new C# features and have been using this approach instead: Array.ForEach<byte>(byteArray, b => b = 0xFF); Granted, the second approach seems cleaner and is easier on the eye, but how does the performance compare to using the first approach? Am I introducing needless overhead by using Linq and generics? Thanks, Dave

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  • [SQL] Select 3 lastest order for each customer

    - by Ratiug
    Hi Here is my table CusOrder that collect customer order OrderID Cus_ID Product_ID NumberOrder OrderDate 1 0000000001 9 1 6/5/2553 0:00:00 2 0000000001 10 1 6/5/2553 0:00:00 3 0000000004 9 2 13/4/2553 0:00:00 4 0000000004 9 1 17/3/2553 0:00:00 5 0000000002 9 1 22/1/2553 0:00:00 7 0000000005 9 1 16/12/2552 0:00:00 8 0000000003 9 3 13/12/2552 0:00:00 10 0000000001 9 2 19/11/2552 0:00:00 11 0000000003 9 2 10/11/2552 0:00:00 12 0000000002 9 1 23/11/2552 0:00:00 I need to select 3 lastest order for each customer and I need all customer so it will show each customer and his/her 3 lastest order how can I do it sorry for my bad english

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  • Create xml file based on xPath from Excel with VBA

    - by user1626236
    I've found some items that seem to dance around what I'm looking to do. I'm not a full-fledged programmer, but have been creating my own macros in Excel. I'm trying to create one now that will help me create the structure of an XML file. I want to go down the list of XPaths, and for each one create any parents in the path as needed as well as the child and its value. I'll be adding another aspect to filter it to the fields I want, but the part I'm struggling with is the logic to check if each parent node exists, create it if needed, then add the child and its value. Bonus would be if the output file were formatted with each node on a new line, and more so if it child nodes were indented from parent, but just creating it is my primary concern. Any help would be much appreciated, this has to potential to save me a lot of time.

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  • Why would you use a MyObject[] internally, but expose a List<MyObject>?

    - by timmyd
    I have come across a class that has an immutable property: MyObject[] allObjs The property is initialized like this: List<MyObject> objs = createAllMyObjects(); allObjs = objs.toArray(new MyObject[objs.size()]); When it is exposed through the accessor, it's done as a List: public List<MyObject> getAllMyObjects() { return Collections.unmodifiableList(Arrays.asList(allObjs)); } Why would a programmer do this? Is there a benefit that I don't know about? Performance is not a concern, as the array of objs will only ever number in a few dozen elements. It seems that we are going round and round in circles. The class is a sort of factory, so it's got a private constructor and exposes only static methods (not sure if this could be a reason for the madness).

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  • Find where a variable is defined in PHP (And/or SMARTY)?

    - by Jon
    I'm currently working on a very large project, and am under a lot of pressure to finish it soon, and I'm having a serious problem. The programmer who wrote this last defined variables in a very odd way - the config variables aren't all in the same file, they're spread out across the entire project of over 500 files and 100k+ lines of code, and I'm having a hell of a time figuring out where a certain variable is, so I can fix an issue. Is there a way to track this variable down? I believe he's using SMARTY (Which I can not stand, due to issues like this), and the variable is a template variable. I'm fairly sure that the variable I'm looking for was initially defined as a PHP variable, then that variable is passed into SMARTY, so I'd like to track down the PHP one, however if that's impossible - how can I track down where he defined the variable for SMARTY? P.S. I'm in Vista, and don't have ssh access to the server, so 'grep' is out of the question.

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