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• Usage examples of binary search

  - by python dude

  I just realized that in my 4+ years of Java programming (mostly desktop apps) I never used the binary search methods in the Arrays class for anything practical. Not even once. Some reasons I can think of: 100% of the time you can get away with linear search, maps or something else that isn't binary search. The incoming data is almost never sorted, and making it sorted requires an extra sorting step. So I wonder if it's just me, or do a lot of people never use binary search? And what are some good, practical usage examples of binary search?

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• Is it possible to auto generate Getter/Setter from Array Values in PHP?

  - by Phill Pafford

  So I have a couple of arrays $array_1 = Array('one','two','three'); $array_2 = Array('red','blue','green'); Is there a dynamic way to create the Setters and Getters for an array with single value entries? So the class would be something like: class xFromArray() { } So the above if I passed $array_1 it would generate something like this: private $one; setOne($x) { $one = $x; } getOne() { return $one; } if I passed $array_2 it would generate something like this: private $red; setRed($x) { $red = $x; } getRed() { return $red; } So I would call it somehow like this? (My best guess but doesn't seem that this would work) $xFromArray = new xFromArray; foreach($array_1 as $key=>$data) { $xFromArray->create_function(set.ucfirst($data)($data)); echo $xFromArray->create_function(get.ucfirst($data)); }

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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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• Array or array element in C?

  - by user3646717

  I'm reading a book about C programming, and I'm not sure whether there is an error in the book or not. Its about arrays and has the following array example: Then it says: The following statements sets all the elements in row 2 of array to zero: for( column = 0; column <= 3; column++) a[ 2 ][ column ] = 0; The preceding for statement is equivalent to the assignment statements: a[ 2 ][ 0 ] = 0; a[ 2 ][ 1 ] = 0; a[ 2 ][ 2 ] = 0; a[ 2 ][ 3 ] = 0; Shouldn't it say "The following statements sets all the elements in row 1 to zero"?. Because if I say a[ 3 ] I am talking about the row 2, if I say a[ 2 ] I am talking about row 1 and if I say a[ 1 ] I am talking about row 0.

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• Unexpected output on initializing array by using both `element-by-element` & `designated` technique

  - by haccks

  C99 provides a feature to initialize arrays by using both element-by-element & designated method together as: int a[] = {2,1,[3] = 5,[5] = 9,6,[8] = 4}; On running the code: #include <stdio.h> int main() { int a[] = {2,1,[3] = 5,[0] = 9,4,[6] = 25}; for(int i = 0; i < sizeof(a)/sizeof(a[0]); i++) printf("%d ",a[i]); return 0; } (Note that Element 0 is initialized to 2 and then again initialised by designator [0] to 9) I was expecting that element 0(which is 2) will be replaced by 9(as designator [0] = 9) and hence o/p will become 9 1 0 5 4 0 25 Unfortunately I was wrong as o/p came; 9 4 0 5 0 0 25 Any explanation for unexpected o/p?

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• How to implement efficient Fog of War?

  - by Cambrano

  I've asked a question how to implement Fog Of War(FOW) with shaders. Well I've got this working. I use the vertex color to identify the alpha of a single vertex. I guess the most of you know what the FOW of Age of Empires was like, anyway I'll shortly explain it: You have a map. Everything is unexplored(solid black / 100% transparency) at the beginning. When your NPC's / other game units explore the world (by moving around mostly) they unshadow the map. That means. Everything in a specific radius (viewrange) around a NPC is visible (0%transparency). Anything that is out of viewrange but already explored is visible but shadowed (50% transparency). So yeah, AoE had relatively huge maps. Requirements was something around 100mhz etc. So it should be relatively easy to implement something to solve this problem - actually. Okay. I'm currently adding planes above my world and set the color per vertex. Why do I use many planes ? Unity has a vertex limit of 65.000 per mesh. According to the size of my tiles and the size of my map I need more than one plane. So I actually need a lot of planes. This is obviously pita for my FPS. Well so my question is, what are simple (in sense of performance) techniques to implement a FOW shader? Okay some simplified code what I'm doin so far: // Setup for (int x = 0; x < (Map.Dimension/planeSize); x++) { for (int z = 0; z < (Map.Dimension/planeSize); z++) { CreateMeshAt(x*planeSize, 3, z*planeSize) } } // Explore (is called from NPCs when walking for example) for (int x = ((int) from.x - radius); x < from.x + radius; x ++) { for (int z = ((int) from.z - radius); z < from.z + radius; z ++) { if (from.Distance(x, 1, z) > radius) continue; _transparency[x/tileSize, z/tileSize] = 0.5f; } } // Update foreach(GameObject plane in planes){ foreach(Vector3 vertex in vertices){ Vector3 worldPos = GetWorldPos(vertex); vertex.Color = new Color(0,0,0, _transparency[worldPos.x/tileSize, worldPos.z/tileSize]); } } My shader just sets the transparency of the vertex now, which comes from the vertex color channel

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• Maya is lagging in a specific way...?

  - by Aerovistae

  My Maya installation worked perfectly. It is not my computer. Something caused it to stop working overnight, somehow. When I try to drag a vertex or something like that, it moves the vertex, but then I have to click like 3 times somewhere outside the mesh before the actual mesh will catch up and follow the vertex. Until I do that, it just stays as it was, with a floating vertex somewhere inside it or outside it. It makes modeling borderline impossible and completely infuriating. What ought to be happening is what we're all used to-- as I move the vertex, the mesh follows it actively, so I can see what it looks like at every given moment until I release the vertex in its new position. Other weird thing: this only applies to complex meshes, like a couple thousand faces. A simple cube works fine. What gives?? Anybody?

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• How to Convert arrays or SimpleXML-Objects into an XML-String

  - by streetparade

  I want to create a xml from a given string, i have a function but i didn't wrote it.It seems a bit cryptical too. Can please some one review it and give me some Ideas, how it could be written clearer for everybody? /** * Converts arrays or SimpleXML-Objects into an XML-String * @params mixed Accepts an array or xml string with data to Post * @params integer DO NOT PROVIDE. Internal Usage for recursion only */ private function mixedDataToXML($data, $level = 1) { if(!$data){ return FALSE; } if(is_array($data)) { $xml = ''; if ($level==1) { $xml .= '<?xml version="1.0" encoding="ISO-8859-1"?>'."\n"; } foreach ($data as $key => $value) { $key = strtolower($key); if (is_array($value)) { $multi_tags = false; foreach($value as $key2=>$value2) { if (is_array($value2)) { $xml .= str_repeat("\t",$level)."<$key>\n"; $xml .= $this->mixedDataToXML($value2, $level+1); $xml .= str_repeat("\t",$level)."</$key>\n"; $multi_tags = true; } else { if (trim($value2)!='') { if (htmlspecialchars($value2)!=$value2) { $xml .= str_repeat("\t",$level). "<$key><![CDATA[$value2]]>". "</$key>\n"; } else { $xml .= str_repeat("\t",$level). "<$key>$value2</$key>\n"; } } $multi_tags = true; } } if (!$multi_tags and count($value)>0) { $xml .= str_repeat("\t",$level)."<$key>\n"; $xml .= $this->mixedDataToXML($value, $level+1); $xml .= str_repeat("\t",$level)."</$key>\n"; } } else { if (trim($value)!='') { if (htmlspecialchars($value)!=$value) { $xml .= str_repeat("\t",$level)."<$key>". "<![CDATA[$value]]></$key>\n"; } else { $xml .= str_repeat("\t",$level). "<$key>$value</$key>\n"; } } } } return $xml; }else{ return (string)$data; } }

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• command&pointer&malloc [closed]

  - by gcc

  input 23 3 4 4 42 n 23 0 9 9 n n n 3 9 9 x //according to input,i should create int pointer arrays. pointer arrays starting from 1 (that is initial arrays is arrays[1].when program sees n ,it must be jumb to arrays 2 expected output arrays[1] 3 4 5 42 arrays[2] 23 0 9 9 arrays[5] 3 9 9 x is stopper n is comman to create new pointer array i am new in this site anyone help me how can i write

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• Reading in a 5000 line text file on the Iphone

  - by howsyourface

  Gday, I am trying to create a tiled map for my game, i have had this previously working using other xml methods but i had memory leaks and all sorts of errors. However i had a map load time of about 2.5 - 3 seconds. So i rewrote all of the code using NSMutableStrings and NSStrings. After my best attempt at optomizing it i had a map load time of 10 - 11 seconds, which is far too slow. So i have now rewritten the code using char* arrays, only to now have a load time of 18 seconds -_-. Here is the latest code, i don't know much c so i could have easily botched the whole thing up. FILE* file = fopen(a, "r"); fseek(file, 0L, SEEK_END); length = ftell(file); fseek(file,0L, SEEK_SET); char fileText[length +1]; char buffer[1024];// = malloc(1024); while(fgets(buffer, 1024, file) != NULL) { strncat(fileText, buffer, strlen(buffer)); } fclose(file); [self parseMapFile:fileText]; - (void)parseMapFile:(char*)tiledXML { currentLayerID = 0; currentTileSetID = 0; tileX = 0; tileY = 0; int tmpGid; NSString* tmpName; int tmpTileWidth; int tmpTileHeight; int tilesetCounter = 0; NSString* tmpLayerName; int tmpLayerHeight; int tmpLayerWidth; int layerCounter = 0; tileX = 0; tileY = 0; int tmpFirstGid = 0; int x; int index; char* r; int counter = 0; while ((x = [self findSubstring:tiledXML substring:"\n"]) != 0) { counter ++; char result[x + 1]; r = &result[0]; [self substringIndex:tiledXML index:x newArray:result]; tiledXML += x+2; index = 0; if (counter == 1) { continue; } else if (counter == 2) { char result1[5]; index = [self getStringBetweenStrings:r substring1:"th=\"" substring2:"\"" newArray:result1]; if (r != 0); mapWidth = atoi(result1); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"ht=\"" substring2:"\"" newArray:result1]; if (r != 0); mapHeight = atoi(result1); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"th=\"" substring2:"\"" newArray:result1]; if (r != 0); tileWidth = atoi(result1); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"ht=\"" substring2:"\"" newArray:result1]; if (r != 0); tileHeight = atoi(result1); continue; } char result2[50]; char result3[3]; if ((index = [self getStringBetweenStrings:r substring1:" gid=\"" substring2:"\"" newArray:result3]) != 0) { tmpGid = atoi(result3); free(result2); if(tmpGid == 0) { [currentLayer addTileAtX:tileX y:tileY tileSetID:-1 tileID:0 globalID:0]; } else { [currentLayer addTileAtX:tileX y:tileY tileSetID:[currentTileSet tileSetID] tileID:tmpGid - [currentTileSet firstGID] globalID:tmpGid]; } tileX ++; if (tileX > [currentLayer layerWidth]-1) { tileY ++; tileX = 0; } } else if ((index = [self getStringBetweenStrings:r substring1:"tgid=\"" substring2:"\"" newArray:result2]) != 0) { tmpFirstGid = atoi(result2); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"me=\"" substring2:"\"" newArray:result2]; if (r != 0); tmpName = [NSString stringWithUTF8String:result2]; r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"th=\"" substring2:"\"" newArray:result2]; if (r != 0); tmpTileWidth = atoi(result2); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"ht=\"" substring2:"\"" newArray:result2]; if (r != 0); tmpTileHeight = atoi(result2); } else if ((index = [self getStringBetweenStrings:r substring1:"rce=\"" substring2:"\"" newArray:result2]) != 0) { currentTileSet = [[TileSet alloc] initWithImageNamed:[NSString stringWithUTF8String:result2] name:tmpName tileSetID:tilesetCounter firstGID:tmpFirstGid tileWidth:tmpTileWidth tileHeight:tmpTileHeight spacing:0]; [tileSets addObject:currentTileSet]; [currentTileSet release]; tilesetCounter ++; } else if ((index = [self getStringBetweenStrings:r substring1:"r name=\"" substring2:"\"" newArray:result2]) != 0) { tileX = 0; tileY = 0; tmpLayerName = [NSString stringWithUTF8String:result2]; r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"th=\"" substring2:"\"" newArray:result2]; if (r != 0); tmpLayerWidth = atoi(result2); r += index +1; index = 0; index = [self getStringBetweenStrings:r substring1:"ht=\"" substring2:"\"" newArray:result2]; if (r != 0); tmpLayerHeight = atoi(result2); currentLayer = [[Layer alloc] initWithName:tmpLayerName layerID:layerCounter layerWidth:tmpLayerWidth layerHeight:tmpLayerHeight]; [layers addObject:currentLayer]; [currentLayer release]; layerCounter ++; } } } -(void)substringIndex:(char*)c index:(int)x newArray:(char*)result { result[0] = 0; for (int i = 0; i < strlen(c); i++) { result[i] = c[i]; if (i == x) { result[i+1] = '\0'; break; } } } -(int)findSubstring:(char*)c substring:(char*)s { int sCounter = 0; int index = 0; int d; for (int i = 0; i < strlen(c); i ++) { if (i > 500)//max line size break; if (c[i] == s[sCounter]) { d = strlen(s); sCounter ++; if (d > sCounter) { } else { index = i - (d); break; } } else sCounter = 0; } return index; } -(int)getStringBetweenStrings:(char*)c substring1:(char*)s substring2:(char*)s2 newArray:(char*)result { int sCounter = 0; int sCounter2 = 0; int index = 0; int index2 = 0; int d; for (int i = 0; i < strlen(c); i ++) { if (index != 0) { if (c[i] == s2[sCounter2]) { d = strlen(s2); sCounter2 ++; if (d > sCounter2) { } else { index2 = i - (d); break; } } else sCounter2 = 0; } else { if (c[i] == s[sCounter]) { d = strlen(s); sCounter ++; if (d > sCounter) { } else { index = i; } } else sCounter = 0; } } if (index != 0 && index2 != 0) [self substringIndex:(c + index+1) index:index2-index-1 newArray:result]; return index; } (I know it's a lot of code to be putting in here) I thought the by using basic char arrays i could drastically increase the performance, at least over the initial node based code that i was replacing. Thanks for all your efforts.

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• Build a Drill Down TableView with arrays

  - by skiria

  I'm trying to build a Drill down tableview to show the information that I have in a hierachy of arrays and classes. I have 3 classes: class Video { nameVideo, id, description, user... } class Topic {nameTopic, topicID, NSMutableArray videos; } class Category {nameCategory, categoryID, NSMUtableArray topics} And then in my app delegate I defined //AppDelegate.h NSMutableArray categories; The app display the tableView with nameCategory, but then, when I select a row it shows a tableview with 0 rows. If I check, for the second view the NumberOfRowsInSection, it returns me 0. I supose that the error is that I don't build correctly the provisional array called tableDataSource, I don't know the reason why it doesn't copy the new information on this array. ` - (void)viewDidLoad { [super viewDidLoad]; appDelegate = (TSCAppDelegate *)[[UIApplication sharedApplication] delegate]; //self.title = @"Categoria"; if(CurrentLevel == 0) { //Initialize our table data source NSArray *tempArray = [[NSArray alloc] init]; self.tableDataSource = tempArray; [tempArray release]; self.tableDataSource = appDelegate.categories; self.navigationItem.title = @"Categoria"; CurrentTitle = @"Categoria"; } else { self.navigationItem.title = CurrentTitle; } } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } // Customize the number of rows in the table view. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSLog (@"contador_ %i,", [self.tableDataSource count]); //--> On the second view it is 0! return [self.tableDataSource count]; } // Customize the appearance of table view cells. - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier]autorelease]; } // Configure the cell. if (CurrentLevel == 0) { Category *aCategory = [self.tableDataSource objectAtIndex:indexPath.row]; cell.text = aCategory.nameCategory; } if (CurrentLevel == 1) { Topic *aTopic = [self.tableDataSource objectAtIndex:indexPath.row]; cell.text = aTopic.nameTopic; } else if ([CurrentLevel == 0]){ Topic *aTopic = [self.tableDataSource objectAtIndex:indexPath.row]; cell.text = aTopic.nameTopic; //NSLog(@"inside!!"); } cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; return cell; } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { //Get the actual Category Category *aCategory = [self.tableDataSource objectAtIndex:indexPath.row]; //NSLog (@" CATEGORY: %@", aCategory.nameCategory); //NSLog (@" CATEGORY: %i", aCategory.categoryID); //NSLog (@" TOPICS OF CATEGORY: %i", [aCategory.topics count]); //Prepare to tableview. navegaTableViewController *nvController = [[navegaTableViewController alloc] initWithNibName:@"navegaTableView" bundle:[NSBundle mainBundle]]; //Increment the Current View nvController.CurrentLevel += 1; //Set the title; nvController.CurrentTitle = @"Topic"; nvController.tableDataSource = aCategory.topics; //Push the new table view on the stack [self.navigationController pushViewController:nvController animated:YES]; [nvController release]; } `

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• Generating Deep Arrays: Shallow to Deep, Deep to Shallow or Bad idea?

  - by MobyD

  I'm working on an array structure that will be used as the data source for a report template in a web app. The data comes from relatively complex SQL queries that return one or many rows as one dimensional associative arrays. In the case of many, they are turned into two dimensional indexed array. The data is complex and in some cases there is a lot of it. To save trips to the database (which are extremely expensive in this scenario) I'm attempting to get all of the basic arrays (1 and 2 dimension raw database data) and put them, conditionally, into a single, five level deep array. Organizing the data in PHP seems like a better idea than by using where statements in the SQL. Array Structure Array of years( year => array of types( types => array of information( total => value, table => array of data( index => db array ) ) ) ) My first question is, is this a bad idea. Are arrays like this appropriate for this situation? If this would work, how should I go about populating it? My initial thought was shallow to deep, but the more I work on this, the more I realize that it'd be very difficult to abstract out the conditionals that determine where each item goes in the array. So it seems that starting from the most deeply nested data may be the approach I should take. If this is array abuse, what alternatives exist?

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• Would it be a good idea to work on letting people add arrays of numbers in javascript?

  - by OneThreeSeven

  I am a very mathematically oriented programmer, and I happen to be doing a lot of java script these days. I am really disappointed in the math aspects of javascript: the Math object is almost a joke because it has so few methods you can't use ^ for exponentiation the + operator is very limited, you cant add array's of numbers or do scalar multiplication on arrays Now I have written some pretty basic extensions to the Math object and have considered writing a library of advanced Math features, amazingly there doesn't seem to be any sort of standard library already out even for calculus, although there is one for vectors and matricies I was able find. The notation for working with vectors and matricies is really bad when you can't use the + operator on arrays, and you cant do scalar multiplication. For example, here is a hideous expression for subtracting two vectors, A - B: Math.vectorAddition(A,Math.scalarMultiplication(-1,B)); I have been looking for some kind of open-source project to contribute to for awhile, and even though my C++ is a bit rusty I would very much like to get into the code for V8 engine and extend the + operator to work on arrays, to get scalar multiplication to work, and possibly to get the ^ operator to work for exponentiation. These things would greatly enhance the utility of any mathematical javascript framework. I really don't know how to get involved in something like the V8 engine other than download the code and start working on it. Of course I'm afraid that since V8 is chrome specific, that without browser cross-compatibility a fundamental change of this type is likely to be rejected for V8. I was hoping someone could either tell me why this is a bad idea, or else give me some pointers about how to proceed at this point to get some kind of approval to add these features. Thanks!

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• What is wrong with this solution? (Perm-Missing-Elem codility test)

  - by user2956907

  I have started playing with codility and came across this problem: A zero-indexed array A consisting of N different integers is given. The array contains integers in the range [1..(N + 1)], which means that exactly one element is missing. Your goal is to find that missing element. Write a function: int solution(int A[], int N); that, given a zero-indexed array A, returns the value of the missing element. For example, given array A such that: A[0] = 2 A[1] = 3 A[2] = 1 A[3] = 5 the function should return 4, as it is the missing element. Assume that: N is an integer within the range [0..100,000]; the elements of A are all distinct; each element of array A is an integer within the range [1..(N + 1)]. Complexity: expected worst-case time complexity is O(N); expected worst-case space complexity is O(1), beyond input storage (not counting the storage required for input arguments). I have submitted the following solution (in PHP): function solution($A) { $nr = count($A); $totalSum = (($nr+1)*($nr+2))/2; $arrSum = array_sum($A); return ($totalSum-$arrSum); } which gave me a score of 66 of 100, because it was failing the test involving large arrays: "large_range range sequence, length = ~100,000" with the result: RUNTIME ERROR tested program terminated unexpectedly stdout: Invalid result type, int expected. I tested locally with an array of 100.000 elements, and it worked without any problems. So, what seems to be the problem with my code and what kind of test cases did codility use to return "Invalid result type, int expected"?

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• slicing a 2d numpy array

  - by MedicalMath

  The following code: import numpy as p myarr=[[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6],[0,1],[0,6]] copy=p.array(myarr) p.mean(copy)[:,1] Is generating the following error message: Traceback (most recent call last): File "<pyshell#3>", line 1, in <module> p.mean(copy)[:,1] IndexError: 0-d arrays can only use a single () or a list of newaxes (and a single ...) as an index I looked up the syntax at this link and I seem to be using the correct syntax to slice. However, when I type copy[:,1] into the Python shell, it gives me the following output, which is clearly wrong, and is probably what is throwing the error: array([1, 6, 1, 6, 1, 6, 1, 6, 1, 6, 1, 6, 1, 6, 1, 6, 1, 6]) Can anyone show me how to fix my code so that I can extract the second column and then take the mean of the second column as intended in the original code above? EDIT: Thank you for your solutions. However, my posting was an oversimplification of my real problem. I used your solutions in my real code, and got a new error. Here is my real code with one of your solutions that I tried: filteredSignalArray=p.array(filteredSignalArray) logical=p.logical_and(EndTime-10.0<=matchingTimeArray,matchingTimeArray<=EndTime) finalStageTime=matchingTimeArray.compress(logical) finalStageFiltered=filteredSignalArray.compress(logical) for j in range(len(finalStageTime)): if j == 0: outputArray=[[finalStageTime[j],finalStageFiltered[j]]] else: outputArray+=[[finalStageTime[j],finalStageFiltered[j]]] print 'outputArray[:,1].mean() is: ',outputArray[:,1].mean() And here is the error message that is now being generated by the new code: File "mypath\myscript.py", line 1545, in WriteToOutput10SecondsBeforeTimeMarker print 'outputArray[:,1].mean() is: ',outputArray[:,1].mean() TypeError: list indices must be integers, not tuple Second EDIT: This is solved now that I added: outputArray=p.array(outputArray) above my code. I have been at this too many hours and need to take a break for a while if I am making these kinds of mistakes.

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• Getting duplicate key values in array

  - by WmasterJ

  For some reason when trying to populate an array I am not getting the desired result. In the first part I create an array of arrays, the key of each has a name such as "Biology Education". But when I then populate that same array it doesn't for some reason use the same array element but a new one. So part 1 results in an array with 13 array elements (empty). After part 2 has run the array has 26 array elements, with the first 13 empty and the other 13 populated as wanted. The reason why I want to work is that the first 13 array elements are sorted. The last 13 are jumbled. Why is this happening and how can I correct it? // PART 1 // Create array of research areas $research_result = db_fetch_array($research['research_query_result']); $research['areas'] = explode("\n", $research_result['options']); // Put the values as key and every key the new value of an array object $research['areas'] = array_fill_keys($research['areas'], array()); // PART 2 foreach($research['user'] as $uid => &$user_object) { $user_object->profile_research_areas = explode(", ", $user_object->profile_research_areas); foreach($user_object->profile_research_areas as $key => $area) { $research['areas'][$area][] = $uid; } }

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• Alternative to array_shift function

  - by SoLoGHoST

  Ok, I need keys to be preserved within this array and I just want to shift the 1st element from this array. Actually I know that the first key of this array will always be 1 when I do this: // Sort it by 1st group and 1st layout. ksort($disabled_sections); foreach($disabled_sections as &$grouplayout) ksort($grouplayout); Basically I'd rather not have to ksort it in order to grab this array where the key = 1. And, honestly, I'm not a big fan of array_shift, it just takes to long IMO. Is there another way. Perhaps a way to extract the entire array where $disabled_sections[1] is found without having to do a foreach and sorting it, and array_shift. I just wanna add $disabled[1] to a different array and remove it from this array altogether. While keeping both arrays keys structured the way they are. Technically, it would even be fine to do this: $array = array(); $array = $disabled_sections[1]; But it needs to remove it from $disabled_sections. Can I use something like this approach... $array = array(); $array = $disabled_sections[1]; $disabled_sections -= $disabled_sections[1]; Is something like the above even possible?? Thanks.

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• How to select a rectangle from List<Rectangle[]> with Linq

  - by dboarman

  I have a list of DrawObject[]. Each DrawObject has a Rectangle property. Here is my event: List<Canvas.DrawObject[]> matrix; void Control_MouseMove ( object sender, MouseEventArgs e ) { IEnumerable<Canvas.DrawObject> tile = Enumerable.Range( 0, matrix.Capacity - 1) .Where(row => Enumerable.Range(0, matrix[row].Length -1) .Where(column => this[column, row].Rectangle.Contains(e.Location))) .????; } I am not sure exactly what my final select command should be in place of the "????". Also, I was getting an error: cannot convert IEnumerable to bool. I've read several questions about performing a linq query on a list of arrays, but I can't quite get what is going wrong with this. Any help? Edit Apologies for not being clear in my intentions with the implementation. I intend to select the DrawObject that currently contains the mouse location.

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• jQuery: Using autocomplete to add values to two fields instead of one

  - by rayne

  I want to use the autocomplete plugin for jQuery to populate not one, but two fields when selecting one of the autocomplete values - the name of a band is entered in the #band input field, but the band url (if exists) should also automatically be added to the #url input field when selecting the band name. Right now I simply have an un-pretty list in an external php file from which the autocompleter takes it's values: $bands_sql = "SELECT bands.name, bands.url FROM bands ORDER BY name"; $bands_result = mysql_query($bands_sql) or print (mysql_error()); while ($bands_row = mysql_fetch_array($bands_result)) { $band_name = $bands_row['name']; $band_url = $bands_row['url']; echo $band_name."\n"; #needs to be replaced with an array that holds name and url } My autocomplete function looks very basic atm, but as I'm an absolute beginner when it comes to jQuery (and also clueless when it comes to PHP arrays), I have no idea how to tell it to populate two fields and not one. $(document).ready(function() { $("#band").autocomplete('/autocomplete-bands.php'); }); Is that even possible?!

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• create this array

  - by calccrypto

  i know this sounds silly, but can someone please post the arrays described by rfc2612: Cm = 0x5A827999 Mm = 0x6ED9EBA1 Cr = 19 Mr = 17 for (i=0; i<24; i++) { for (j=0; j<8; j++) { Tmj_(i) = Cm Cm = (Cm + Mm) mod 2**32 Trj_(i) = Cr Cr = (Cr + Mr) mod 32 } } i think im doing is wrong for some reason i get this for Tr [[10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2], [10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2, 10, 18, 26, 2]]

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• Array Recursion

  - by GeeYouAreYou

  I've got an assignment I can't figure out, any pointers will be much appreciated, it goes like so: There's a series of light bulbs represented as an array of true/false, there's a switch for every light bulb, by clicking it for any light bulb, you toggle it as well as 2 adjacent ones (1 from left & another 1 from right; if clicked switch's bulb on edge -- only 1 adjacent toggled of course). What is needed to accomplish is a method that accepts an array of a series of turned on/off light bulbs and another one representing another state of supposedly the 1st array after some switches have been clicked..! So recursion must be used to find out whether there's a combination of switch clicks that will transform array 1 to array 2. Here's the signature of the method: public static boolean disco(boolean[] init, boolean[] target) Will return true if array init can be transformed to target, false otherwise. Method must be static and not use any other static and global variables, only local. Example: boolean[] init = {true, false, true, false, true, false}; boolean[] target = {false, true, false, true, false, true}; For above 2 arrays, disco(init, target) will return true because toggling the 1st and 4th bulbs would yield the target state (remember adjacent bulbs being toggled as well). Any help much appreciated..!!

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• Can't empty JS array....

  - by solefald

  Yes, I am having issues with this very basic (or so it seems) thing. I am pretty new to JS and still trying to get my head around it, but I am pretty familiar with PHP and have never experienced anything like this. I just can not empty this damn array, and stuff keeps getting added to the end every time i run this. I have no idea why, and i am starting to think that it is somehow related to the way chekbox id's are named, but i may be mistaking.... id="alias[1321-213]", id="alias[1128-397]", id="alias[77-5467]" and so on. I have tried sticking checkboxes = []; and checkboxes.length = 0; In every place possible. Right after the beginning of the function, at the end of the function, even outside, right before the function, but it does not help, and the only way to empty this array is to reload the page. Please tell me what I am doing wrong, or at least point me to a place where i can RTFM. I am completely out of ideas here. function() { var checkboxes = new Array(); checkboxes = $(':input[name="checkbox"]'); $.each(checkboxes, function(key, value) { console.log(value.id); alert(value.id); } ); checkboxes.length = 0; } I have also read Mastering Javascript Arrays 3 times to make sure I am not doing something wrong, but still can't figure it out....

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• take values from table cells and turn into array

  - by liz

  using jquery I need to retrieve an array from table cells, format the data and pass it into a js function. the code i am using is this: var l1 = new Array(); $('table#datatable tbody td:first-child').each(function() { l1.push($(this).text()); }); this is the table fragment <tr> <th scope="row">Age: 0-4</th> <td>0</td> <td>9.7</td> </tr> <tr> <th scope="row">5-17</th> <td>23.6</td> <td>18.0</td> </tr> <tr> <th scope="row">Total 0-17</th> <td>20.6</td> <td>16.1</td> </tr> the table's id is "datatable". i want to return an array of the contents of each first td and then format it like this: 0,23.6,20.6 i am very new to using arrays...

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• warning: assignment makes pointer from integer without a cast

  - by FILIaS

  Im new in programming c with arrays and files. Im just trying to run the following code but i get warnings like that: warning: assignment makes pointer from integer without a cast Any help? It might be silly... but I cant find what's wrong. FILE *fp; FILE *cw; char filename_game[40],filename_words[40]; int main() { while(1) { /* Input filenames. */ printf("\n Enter the name of the file with the cryptwords array: \n"); gets(filename_game); printf("\n Give the name of the file with crypted words:\n"); gets(filename_words); /* Try to open the file with the game */ if (fp=fopen("crypt.txt","r")!=NULL) { printf("\n Successful opening %s \n",filename_game); fclose(fp); puts("\n Enter x to exit,any other to continue! \n "); if ( (getc(stdin))=='x') break; else continue; } else { fprintf(stderr,"ERROR!%s \n",filename_game); puts("\n Enter x to exit,any other to continue! \n"); if (getc(stdin)=='x') break; else continue; } /* Try to open the file with the names. */ if (cw=fopen("words.txt","r")!=NULL) { printf("\n Successful opening %s \n",filename_words); fclose(cw); puts("\n Enter x to exit,any other to continue \n "); if ( (getc(stdin))=='x') break; else continue; } else { fprintf(stderr,"ERROR!%s \n",filename_words); puts("\n Enter x to exit,any other to continue! \n"); if (getc(stdin)=='x') break; else continue; } } return 0; }

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• ArrayAccess multidimensional (un)set?

  - by anomareh

  I have a class implementing ArrayAccess and I'm trying to get it to work with a multidimensional array. exists and get work. set and unset are giving me a problem though. class ArrayTest implements ArrayAccess { private $_arr = array( 'test' => array( 'bar' => 1, 'baz' => 2 ) ); public function offsetExists($name) { return isset($this->_arr[$name]); } public function offsetSet($name, $value) { $this->_arr[$name] = $value; } public function offsetGet($name) { return $this->_arr[$name]; } public function offsetUnset($name) { unset($this->_arr[$name]); } } $arrTest = new ArrayTest(); isset($arrTest['test']['bar']); // Returns TRUE echo $arrTest['test']['baz']; // Echo's 2 unset($arrTest['test']['bar']; // Error $arrTest['test']['bar'] = 5; // Error I know $_arr could just be made public so you could access it directly, but for my implementation it's not desired and is private. The last 2 lines throw an error: Notice: Indirect modification of overloaded element. I know ArrayAccess just generally doesn't work with multidimensional arrays, but is there anyway around this or any somewhat clean implementation that will allow the desired functionality? The best idea I could come up with is using a character as a separator and testing for it in set and unset and acting accordingly. Though this gets really ugly really fast if you're dealing with a variable depth. Does anyone know why exists and get work so as to maybe copy over the functionality? Thanks for any help anyone can offer.

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