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  • Array of function pointers in Java

    - by Waltzy
    I have read this question and I'm still not sure whether it is possible to keep pointers to methods in an array in Java, if anyone knows if this is possible or not it would be a real help. I'm trying to find an elegant solution of keeping a list of Strings and associated functions without writing a mess of hundreds of 'if's. Cheers edit- 'functions' changed to 'methods', seems to bug people.

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  • Flip Vertices Array

    - by James
    Hi, I have an array of position vertices that make up a 2D polygon. Vector2[] _chassisConcaveVertices = { new Vector2(5.122f, 0.572f), new Vector2(3.518f, 0.572f), new Vector2(3.458f, 0.169f), new Vector2(2.553f, 0.169f), new Vector2(2.013f, 0.414f), new Vector2(0.992f, 0.769f), new Vector2(0.992f, 1.363f), new Vector2(5.122f, 1.363f), }; What algorithm can I use to modify the positions so the resultant polygon is flipped? I need to flip the polygon both horizontally and vertically.

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  • Trouble with array of dictionaries, ruby

    - by user299450
    I am getting the following error. game.rb:46:in `play': undefined method `[]' for nil:NilClass (NoMethodError) from game.rb:45:in each' from game.rb:45:inplay' from game.rb:56 with this code, def play() currentTile = nil @tiles.each do |tile| if(tile['Name'] == 'Starting Square') currentTile = tile end puts("#{currentTile['Desciption']}") end end This is part of a text adventure game, I am playing with @tiles is an array of tiles that was read from a file. Each tile is a dictionary. Thanks for any help, I cant figure this out

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  • Sorting a 2 dimensional array on multiple columns

    - by Anon
    I need to sort a 2 dimensional array of doubles on multiple columns using either C or C++. Could someone point me to the algorithm that I should use or an existing library (perhaps boost?) that has this functionality? I have a feeling that writing a recursive function may be the way to go but I am too lazy to write out the algorithm or implement it myself if it has been done elsewhere. :-) Thanks

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  • Serialize an object using DataContractJsonSerializer as a json array

    - by rekna
    I have a class which contains a list of items. I want to serialize an instance of this class to json using the DataContractJsonSerializer as a json array. eg. class MyClass { List<MyItem> _items; } class MyItem { public string Name {get;set;} public string Description {get;set;} } When serialized to json it should be like this : [{"Name":"one","Description":"desc1"},{"Name":"two","Description":"desc2"}]

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  • Android pass a 2d int array from one activity to another ERROR

    - by user2189001
    ACTIVITY 1: Bundle bundle = new Bundle(); bundle.putSerializable("CustomLevelData", LevelCreator.LCLevelData); Intent i = new Intent(LevelCreatorPopout.this, GameView.class); i.putExtras(bundle); startActivity(i); ACTIVITY 2: LevelData=(int[][]) extras.getSerializable("CustomLevelData"); ERROR: E/AndroidRuntime(16220): FATAL EXCEPTION: main E/AndroidRuntime(16220): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.powerpoint45.maze/com.powerpoint45.maze.GameView}: java.lang.ClassCastException: java.lang.Object[] cannot be cast to int[][] I have searched but found nothing on 2d INT array passing

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  • (gcc) Multi-Dim Array or Double Pointer for Warning-free Compile

    - by paul simmons
    Hi, I have a function, which is called sometimes with regular, sometimes dynamic arrays. If I define the function as function_name(int[10][10] a) and send int** as a parameter, I get a warning. Opposite, if I declare function_name(int** a) and send int[][] as a parameter (after casting) I cannot access to array elements inside function. What is the correctest way?

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  • MIN array function non zeros only

    - by user1717622
    I have been trying to get this array function to output (non-zero) minimum values in the 'FINAL DATA' AE column. Can you see a structural error in this formula? =IF($C$4="All EMEA", MIN(IF('FINAL DATA'!$2:$AE$250000<>0, ('FINAL DATA'!$J$2:$J$250000=$C$4)*('FINAL DATA'!$E$2:$E$250000=$E$4)*( 'FINAL DATA'!$AE$2:$AE$250000))), MIN(IF('FINAL DATA'!$AE$2:$AE$250000<>0, ('FINAL DATA'!$K$2:$K$250000=$C$4)*('FINAL DATA'!$E$2:$E$250000=$E$4)*( 'FINAL DATA'!$AE$2:$AE$250000))) )

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  • Array increment operator

    - by Stardust
    Could any one please tell me the meaning of "++" with array in the following code in Java: int [ ] arr = new int[ 4 ]; for(int i = 0; i < arr.length; i++){ arr[ i ] = i + 1; System.out.println(arr[ i ]++); } what is arr[ i ]++ meaning in above code, and why we can't do like: arr[ i ]++ = i + 1;

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  • unrecognized selector sent to instance while trying to add an object to a mutable array

    - by madpoet
    I'm following the "Your Second iOS App" and I decided to play with the code to understand Objective C well... What I'm trying to do is simply adding an object to a mutable array in a class. Here are the classes: BirdSighting.h #import <Foundation/Foundation.h> @interface BirdSighting : NSObject @property (nonatomic, copy) NSString *name; @property (nonatomic, copy) NSString *location; @property (nonatomic, copy) NSDate *date; -(id) initWithName: (NSString *) name location:(NSString *) location date:(NSDate *) date; @end BirdSighting.m #import "BirdSighting.h" @implementation BirdSighting -(id) initWithName:(NSString *)name location:(NSString *)location date:(NSDate *)date { self = [super init]; if(self) { _name = name; _location = location; _date = date; return self; } return nil; } @end BirdSightingDataController.h #import <Foundation/Foundation.h> @class BirdSighting; @interface BirdSightingDataController : NSObject @property (nonatomic, copy) NSMutableArray *masterBirdSightingList; - (NSUInteger) countOfList; - (BirdSighting *) objectInListAtIndex: (NSUInteger) theIndex; - (void) addBirdSightingWithSighting: (BirdSighting *) sighting; @end BirdSightingDataController.m #import "BirdSightingDataController.h" @implementation BirdSightingDataController - (id) init { if(self = [super init]) { NSMutableArray *sightingList = [[NSMutableArray alloc] init]; self.masterBirdSightingList = sightingList; return self; } return nil; } -(NSUInteger) countOfList { return [self.masterBirdSightingList count]; } - (BirdSighting *) objectInListAtIndex: (NSUInteger) theIndex { return [self.masterBirdSightingList objectAtIndex:theIndex]; } - (void) addBirdSightingWithSighting: (BirdSighting *) sighting { [self.masterBirdSightingList addObject:sighting]; } @end And this is where I'm trying to add a BirdSighting instance to the mutable array: #import "BirdsMasterViewController.h" #import "BirdsDetailViewController.h" #import "BirdSightingDataController.h" #import "BirdSighting.h" @implementation BirdsMasterViewController - (void)awakeFromNib { [super awakeFromNib]; BirdSightingDataController *dataController = [[BirdSightingDataController alloc] init]; NSDate *date = [NSDate date]; BirdSighting *sighting = [[[BirdSighting alloc] init] initWithName:@"Ebabil" location:@"Ankara" date: date]; [dataController addBirdSightingWithSighting: sighting]; NSLog(@"dataController: %@", dataController.masterBirdSightingList); self.dataController = dataController; } .......... @end It throws NSInvalidArgumentException in BirdSightingDataController addBirdSightingWithSighting method... What am I doing wrong?

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  • String array definition in JAVA

    - by Mohamed KALLEL
    Is it possible to define array in this way in JAVA, otherwise are there an alternative close this definition? private final int CONST_0= 0; private final int CONST_1= 1; private final int CONST_2= 2; private final int CONST_3= 3; private final String[] CONST_TXTRECORDS = new String[] {[CONST_0] = "test0", {[CONST_1] = "test1", {[CONST_2] = "test2", {[CONST_3] = "test3"};

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