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• Problem in appending a string to a already filled string builder(at the beginning by using INSERT) a

  - by Newbie

  I have a string builder like StringBuilder sb = new StringBuilder("Value1"); sb.AppendLine("Value2"); Now I have a string say string str = "value 0"; I did sb.Insert(0,str); and then string[] strArr = sb.ToString().Trim().Replace("\r", string.Empty).Split('\n'); The result I am getting as (Array size of 2 where I should get 3) [0] value 0 Value1 [1] value2 But the desired output being [0] Value 0 [1] Value1 [2] Value2 Where I am going wrong? I am using C#3.0 Please help.. It 's urgent Thanks

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• Is there a way to get a reference to all the paragraphs or headings in a web page in JavaScript?

  - by mattbd

  I'm writing a simple Greasemonkey script to strip out all the images, headings and paragraphs from a web page (it's because someone wants to use images of several popular websites with the images and text removed in a presentation about branding of websites). I've figured out how to do so with images by using a for loop and the document.images array like this: var i = 0; var imglngth = document.images.length; for(i=0;i<imglngth;i++) { document.images[i].style.display="none"; } However, I don't believe there's an object representing paragraphs or headers. Any suggestions as to how I could implement this?

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• (C++) While reading a file (ifstream), is there any way to direct it to make a new line?

  - by Enzo

  While reading a file (ifstream), is there any way to direct it to make a new line? For instance, I would like for THIS to happen: myfilearray[1]array[2]endl; Obviously, the "endl" just isn't allowed. Is there another way to do this? Edit---thanks for the quick responses guys! From a text file, I'm trying to store two strings from that file into arrays and then do the same with the next line (or until I desire, using a for loop) Using strings is important to me as it will make my future program a lot more flexible.

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• iphone - Images (slide show) and audio snychronization

  - by Qaiser

  I have 20 images and some audio. I would like to show a single image at a time and change the images at (unequal) intervals. For example, I want to show image 1 for 1.44 seconds and image 2 for 1.67 seconds and so on. Can someone suggest how to go about doing this please? What I have seen are examples that show how to setup an array of images with one field that denotes total time. This causes the images to show for an equal amount of time (each). ... and that not what I am looking for ...

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• ListView Item Detail Screen: New or Same Activity?

  - by stormin986

  I have a listview where each item correlates to an instance of an item in an array. When the user selects an item, it will bring up a 'Details' page that reads and displays other data members of the list item. Would this be better implemented with the Details page as its own activity, or a new view within the same activity? Pros and cons of each? A new activity makes my job a little easier in terms of handling the 'back' button, but then I have the challenge of how do I pass the rest of the data structure to the new activity since I can't bundle it up (unless I serialize it).

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• Why use third-party vector libraries at all?

  - by Patrick Powns

  So I'm thinking of using the Eigen matrix library for a project I'm doing (2D space simulator). I just went ahead and profiled some code with Eigen::Vector2d, and with bare arrays. I noticed a 10x improvement in assigning values to elements in the array, and a 40x improvement in calculating the dot products. Here is my profiling if you want to check it out, basically it's ~4.065s against ~0.110s. Obviously bare arrays are much more efficient at dot products and assigning stuff. So why use the Eigen library (or any other library, Eigen just seemed the fastest)? Is it stability? Complicated maths that would be hard to code by yourself efficiently?

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• Solution to compiler warning for generic varargs

  - by TJR

  A puzzle from this blog. Similar to SO1445233. Given the following source listing, explain why the compiler is producing a warning at invocation to the list method and give a solution for removing the warning without resorting to @SuppressWarnings annotation. public class JavaLanguagePuzzle3 { public static void main(String[] args) { list("1", 2, new BigDecimal("3.5")); } private static <T> List<T> list(T... items) { return Arrays.asList(items); } } Warning: Type safety: A generic array of Object&Serializable&Comparable<?> is created for a varargs parameter

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• is the + in += on a Map a prefix operator of =?

  - by Steve

  In the book "Programming in Scala" from Martin Odersky there is a simple example in the first chapter: var capital = Map("US" -> "Washington", "France" -> "Paris") capital += ("Japan" -> "Tokyo") The second line can also be written as capital = capital + ("Japan" -> "Tokyo") I am curious about the += notation. In the class Map, I didn't found a += method. I was able to the same behaviour in an own example like class Foo() { def +(value:String) = { println(value) this } } object Main { def main(args: Array[String]) = { var foo = new Foo() foo = foo + "bar" foo += "bar" } } I am questioning myself, why the += notation is possible. It doesn't work if the method in the class Foo is called test for example. This lead me to the prefix notation. Is the + a prefix notation for the assignment sign (=)? Can somebody explain this behaviour?

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• C++ Function Calling Itself

  - by Ben

  Suppose I wish to have a function that fills an array either in pattern x,y,x,y,x,ywhere x and y are variables defined by some algorithm and x,y,z,x,y,z where x, y and z are variables defined by the same algorithm. This should continue for all number of variables. Is this a viable way to implement it. int recurse_n(int n) { while(n > 0) { --n; recurse_n(n); n = 0; // Use algorithm here } }

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• Waiting for DialogActivity to return before continuing executing of the main thread

  - by jax

  How would I force the current thread to wait until another has finished before continuing. In my program the user selects a MODE from an AlertDialog, I want to halt executing of the program before continuing as the mode holds important configuration for the gameplay. new AlertDialog.Builder(this) .setItems(R.array.game_modes, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: setMode(TRAINING_MODE); case 1: setMode(QUIZ_MODE); default: setMode(TRAINING_MODE); break; } //continue loading the rest of onCreate(); contineOnCreate(); } }) .create().show(); If this is impossible can anyone give a possible solution?

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• Super strange PHP error

  - by Industrial

  Hi everyone, When trying memcache:get, I'll get the following error message back: Message: Memcache::get() [memcache.get]: Server localhost (tcp 11211) failed with: Failed reading line from stream (0) I run a Windows 32bit test environment (XP) and here's how my code looks: function getMulti(array $keys) { $items = $this->memcache->get($keys); return $items; } My memcache servers are two local computers in the LAN that my dev. environment is connected to. Sure, I can turn the error logging off or just put an @ before the get function call, but that doesnt solve this issue. What can I do? Thanks a lot!

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• Getting MATLAB variable (string) from C

  - by Hamming

  Hi! I'm writing a small C application that launchs a Matlab script (.m file). I need to exchange some variables and I don't know how to get an array of chars that exists in Matlab. I'm doing something like this: enter code here result = engGetVariable(ep,"X"); if (!result) { printf ("Error..."); exit -1; } int n = mxGetN(result); char *varx = NULL; memcpy(varx, mxGetData(result),n*sizeof(char)); It doesn't work. Does someone know how to get a Matlab string in C? I've read Matlab documentation about engGetVariable() and the provided example but any of this things clarify me.

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• Putting sql result set into JList

  - by 0vertone

  hi there. im working on my second year project and im nearly finished but ive got a problem. i have a table set up in oracle that holds user names, recipients, and messages. i wanted to make a contacts list for sendin messages that would take the user names and put them into a swing jlist but i cant figure out how. i thought maybe if i put the usernames into an array from the sql itd be easier but that didnt work. any ideas?

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• How to parse out html links from a huge string with html links and other text (Java).

  - by Robert

  Hello, my question is how would i be able to go through a string and take out only the links and erase all the rest? I thought about using some type of delemiter, but wouldnt know how to go about using it in java. an example of what i am trying to do: this is my String: String myString = "The file is http: // www. .com/hello.txt and the second file is " + "http: // www. .com/hello2.dat"; I would want the output to be: "http: // www. .com/hello.txt http: // www. .com/hello2.dat" or each could be added to an array, separately. I just want some ideas, id like to write the code myself but am having trouble on how to do it. Any help would be awesome.

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• Is it a good idea to include a large text variable in compiled code?

  - by gladman

  I am writing a program that produces a formatted file for the user, but it's not only producing the formatted file, it does more. I want to distribute a single binary to the end user and when the user runs the program, it will generate the xml file for the user with appropriate data. In order to achieve this, I want to give the file contents to a char array variable that is compiled in code. When the user runs the program, I will write out the char file to generate an xml file for the user. char* buffers = "a xml format file contents, \ this represent many block text \ from a file,..."; I have two questions. Q1. Do you have any other ideas for how to compile my file contents into binary, i.e, distribute as one binary file. Q2. Is this even a good idea as I described above?

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• Switching from php to python

  - by ts

  Hello I am trying to make a list of things which can be difficult/surprising to someone who is changing language from PHP to Python. so far i have rather short list: forget require / include, learn import (this was most difficult to me - to understand package - module - class - object hierarchy and its mapping to filesystem) you can't just upload file on server to have webpage (-mod_python, wsgi etc) learn the python way for use variable class names (new $class() vs import + getattr) / operator in python 2.x and all float-related horrors those were difficult to me, it takes few days before mind adapts a new paradigm after i found that there is few other areas which could be challenging for someone with (too) many years of php: everything is an object you have to live with exceptions array vs list, set, dictionary, tuple ... learn (effective) list comprehensions learn generators any other ideas / personal experiences ?

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• JQuery get element from a string problem

  - by SLC

  Sorry for such a simple question but I can't seem to find the solution. I am trying to fade in and out some divs. Divs have an ID of "div1", "div2", "div3". My code is: var Divs = new Array("div1", "div2", "div3"); I want to fade out one div and then fade in the next on top of it. I have a setinterval that runs every 5 seconds and checked it works. Inside it is this code: $(Divs[1]).fadeOut(1000); $(Divs[2]).fadeIn(1000); However nothing happens when the timer method is ran. Any ideas?

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• Convert Date MMDDYY to Date for database Insert

  - by lesponce

  I got an array with a date set as 071712 . no / slash characters for the date, no dash. nothing, just plain 071712 (coming from a text file). I need to convert the date so I can include it in a SqlServer insert statement. I'm calling a stored procedure for the insert. So far I have this: // This is not working so far. DateTime date = Convert.ToDateTime(fileLines[4]); (date will be used as a parm for the stored procedure)

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• Check directory exists and if it doesnt choose an image

  - by Andy

  I have this code so far which perfectly but relies on there being a directory in place: $path = '/home/sites/therealbeercompany.co.uk/public_html/public/themes/trbc/images/backgrounds/'.$this->slug; $bgimagearray = array(); $iterator = new DirectoryIterator($path); foreach ($iterator as $fileinfo) { if ($fileinfo->isFile() && !preg_match('\.jpg$/', $fileinfo->getFilename())) { $bgimagearray[] = "'" . $fileinfo->getFilename() . "'"; } } I need to work in a bit at the top so that if the directory doesnt exist it defaults to the images sat in the root of the background directory... Any help would be appreciated.

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• PHP: reusing database class

  - by citricsquid

  Hi, I built a class that allows me to do: $db->query($query); and it works perfectly, although if I want to do: $db->query($query); while($row = $db->fetch_assoc()){ $db->query($anotherquery); echo $db->result(); } it "breaks" the class. I don't want to constantly have to redeclare my class (eg: $seconddb = new database()), is there a way to get around this? I want to be able to reuse $db within $db, without overwriting the "outside" db. currently I'm create an array of data (from db-fetch_assoc() then doing a foreach and then doing the db call inside that: $db->query('SELECT * FROM table'); while($row = $db->fetch_assoc()){ $arr[] = $row; } foreach($arr as $a){ $db->query(); // query and processing here } Is this the best method or am I missing the obvious? Should I consider passing a connection link ID with the database connection?

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• How can I improve the performance of this algorithm

  - by Justin

  // Checks whether the array contains two elements whose sum is s. // Input: A list of numbers and an integer s // Output: return True if the answer is yes, else return False public static boolean calvalue (int[] numbers, int s){ for (int i=0; i< numbers.length; i++){ for (int j=i+1; j<numbers.length;j++){ if (numbers[i] < s){ if (numbers[i]+numbers[j] == s){ return true; } } } } return false; }

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• php adding value to session

  - by antikbd

  I am trying to implement a 'shopping cart' where, if the 'Add to Cart' has been clicked, the respective item is either added to the cart or incremented by one if already present. However, the following code isn't working and giving me a "Cannot use a scalar value as an array" error. Any help would be highly appreciated. if (isset($_POST['fan']) && ($_POST['fan']=="Add to Cart")) { if (($_SESSION['cart']['fan']==0) || (!isset($_SESSION['cart']['fan']))) { $_SESSION['cart']['fan']=1; } else { $_SESSION['cart']['fan']++; } }

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• question abouut string sort

  - by davit-datuashvili

  i have question from programming pearls problem is following show how to use lomuto's partitioning scheme to sort varying length bit strings in time proportional to the sum oof their length and algorithm is following each record in x[0..n-1] has an integer length and pointer to the array bit[0..length-1] code void bsort(l,u,depth){ if (l>=u) return; for (int i=l;i<u;i++) if (x[i].length<depth) swap(i,l++); m=l; if (x[i].bit[depth] ==0) swap(i,m++); bsort(l,m-1,depth+1); bsort(m,u,depth+1); please help me i need following things 1. how this algorith works 2.how implement in java?

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• Is there a good way to remove a character from a string without copying all the characters following

  - by piemesons

  I was given an interview question: // The first example: char text[] = "henri"; char *p; p = text; *(p + 1) = 'E'; // Output = hEnri // Now If we want to remove the "e" ie hnri, we would go for????? *(p + 1)=????? The obvious answer is to copy the rest of the array "back" one position. But this seems... unpleasant. Surely there is some better way?

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• Break the limit of threading, segmentation fault

  - by user353573

  use pthread_create to create limited number of threads running concurrently Successfully compile and run However, after adding function pointer array to run the function, Segmentation fault Where is wrong? workserver number: 0 Segmentation fault void* workserver(void arg) { int status; while(true) { printf("workserver number: %d\n", (int)arg); ( job_queue[(int)arg])(); sleep(3); status = pthread_mutex_lock(&data.mutex); if(status != 0) printf("%d lock mutex", status); data.value = 1; status = pthread_cond_signal(&data.cond); if(status != 0) printf("%d signal condition", status); status = pthread_mutex_unlock(&data.mutex); if(status != 0) printf("%d unlock mutex", status); } }

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