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• Using recursion to find paths in a 2D array

  - by rikkit

  Hi, I'm working on a project for my A level. It involves finding the maximum flow of a network, and I'm using javascript. I have a 2D array, with values in the array representing a distance between the two points. An example of the array: 0 2 2 0 0 0 1 2 0 0 0 2 0 0 0 0 I think I need to use a recursive technique to find a path; below is some pseudocode, assuming that the array is 4x4. a is (0,0), b is (3,3). function search(a,b) from a to b if element(i,j) != 0 then store value of element search(j,3) I was wondering if that was the right construction for a depth first search. Thanks for any help.

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• Most mature ASP.NET MVC Blog Engine?

  - by Tony_Henrich

  What's the best ASP.NET MVC based blog engine out there which is ready to deploy? I am guessing there are no MVC blog engines which are comparable with WebForms based blog engines like dasBlog, BlogEngine and subText? I think Oxite is a dead end and Orchid is more like a CMS. Looking for an engine which can do these: - RSS feeds support - anti comment spam functionality like support for Akismet - comment post approval support - Some kind of theming is possible

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• 2D collision detection and stuff with OpenGL

  - by shinjuo

  I am working on a simple 2D openGL project. It contains a main actor you can control with the keyboard arrows. I got that to work okay. What I am wanting is something that can help explain how to make another actor object follow the main actor. Maybe a tutorial on openGL. The three main things I need to learn are the actor following, collision detection, and some kind of way to create gravity. Any good books or tutorials to help get me in the right direction would be great.

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• Null Pointer Exception on a 2D array (Java)

  - by user315156

  I have a class, "Tetris", in which one of the instance variables is "board". "board" is 2D array of Color objects. Upon the creation of a tetris object I call a method that sets the dimensions of board and then sets all of the Color objects to be the Default value, that is to say, Color.blue. public Tetris(int rows, int cols){ this.rows = rows; this.cols = cols; reset(rows, cols); } public void reset(int rows, int cols){ Color[][] board = new Color[rows][cols]; for(int i = 0; i Unfortunately, when I run the code (which obviously has not been posted in its entirety) I get a null pointer exception on the line: board[i][j] = DEFAULT_COLOR; // Color.blue; //DEFAULT-COLOR. Is there anything obviously wrong with what I am doing? (Sorry if there are glaring format issues, this is my first time on Stack Overflow)

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• Best chess engine under permissive free software license

  - by fhucho

  What is the best chess engine released under permissive free software license? By permissive free software license I mean, that it is legal to incorporate the engine's code into my project without having to release the source code of my whole project.

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• Google I/O 2010 - ?Run corp apps on App Engine? Yes we do.

  Google I/O 2010 - ​Run corp apps on App Engine? Yes we do. Google I/O 2010 - ​Run corporate applications on Google App Engine? Yes we do. App Engine, Enterprise 201 Ben Fried, Irwin Boutboul, Justin McWilliams, Matthew Simmons Hear Google CIO Ben Fried and his team of engineers describe how Google builds on App Engine. If you're interested in building corp apps that run on Google's cloud, this team has been doing exactly that. Learn how these teams have been able to respond more quickly to business needs while reducing operational burden. For all I/O 2010 sessions, please go to code.google.com/events/io/2010/sessions.html From: GoogleDevelopers Views: 14 0 ratings Time: 55:53 More in Science & Technology

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• Projecting a 3D point to 2D screen coordinate OpenTK

  - by sinsro

  Using Monotouch and OpenTK I am trying to get the screen coordinate of one 3D point. I have my world view projection matrix set up, and OpenGL makes sense of it and projects my 3D model perfectly, but how to use the same matrix to project just one point from 2D to 3D? I thought I could simply use: Vector3.Transform(ref input3Dpos, ref matWorldViewProjection, out projected2Dpos); Then have the projected screen coordinate in projected2DPos. But the resulting Vector4 does not seem to represent the proper projected screen coordinate. And I do not know how to calculate it from there on.

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• Java: Last access of 2D HashMap

  - by JamieFlowers

  I have the following structure: HashMap< String, HashMap< String, String Now i want to know the last accessed element in the 2nd dimension. I know there is TreeMap which makes sense in the 1rst dimension but after that it doesn't make any sense. How can I keep track of a 2D HashMap ordering? With access i mean: value = hashmap.get("a").get("1") value = hashmap.get("b").get("2") value = hashmap.get("c").get("3") hashmap.removeLast(); hashmap.removeLast(); hashmap.removeLast();

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• formula for best approximation for center of 2D rotation with small angles

  - by RocketSurgeon

  This is not a homework. I am asking to see if problem is classical (trivial) or non-trivial. It looks simple on a surface, and I hope it is truly a simple problem. Have N points (N = 2) with coordinates Xn, Yn on a surface of 2D solid body. Solid body has some small rotation (below Pi/180) combined with small shifts (below 1% of distance between any 2 points of N). Possibly some small deformation too (<<0.001%) Same N points have new coordinates named XXn, YYn Calculate with best approximation the location of center of rotation as point C with coordinates XXX, YYY. Thank you

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• Mapping functions of 2D numpy arrays

  - by perimosocordiae

  I have a function foo that takes a NxM numpy array as an argument and returns a scalar value. I have a AxNxM numpy array data, over which I'd like to map foo to give me a resultant numpy array of length A. Curently, I'm doing this: result = numpy.array([foo(x) for x in data]) It works, but it seems like I'm not taking advantage of the numpy magic (and speed). Is there a better way? I've looked at numpy.vectorize, and numpy.apply_along_axis, but neither works for a function of 2D arrays. EDIT: I'm doing boosted regression on 24x24 image patches, so my AxNxM is something like 1000x24x24. What I called foo above applies a Haar-like feature to a patch (so, not terribly computationally intensive).

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• How to calculate both positive and negative angle between two lines?

  - by Jaanus

  There is a very handy set of 2d geometry utilities here. The angleBetweenLines has a problem, though. The result is always positive. I need to detect both positive and negative angles, so if one line is 15 degrees "above" or "below" the other line, the shape obviously looks different. The configuration I have is that one line remains stationary, while the other line rotates, and I need to understand what direction it is rotating in, by comparing it with the stationary line. EDIT: in response to swestrup's comment below, the situation is actually that I have a single line, and I record its starting position. The line then rotates from its starting position, and I need to calculate the angle from its starting position to current position. E.g if it has rotated clockwise, it is positive rotation; if counterclockwise, then negative. (Or vice versa.) How to improve the algorithm so it returns the angle as both positive or negative depending on how the lines are positioned?

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• loading data from file into 2d array

  - by Chris

  I am just starting with perl and would like some help with arrays please. I am reading lines from a data file and splitting the line into fields: open (INFILE, $infile); do { my $linedata = <INFILE>; my @data= split ',',$linedata; .... } until eof; I then want to store the individual field values (in @data) in and array so that the array looks like the input data file ie, the first "row" of the array contains the first line of data from INFILE etc. Each line of data from the infile contains 4 values, x,y,z and w and once the data are all in the array, I have to pass the array into another program which reads the x,y,z,w and displays the w value on a screen at the point determined by the x,y,z value. I can not pas the data to the other program on a row-by-row basis as the program expects the data to in a 2d matrtix format. Any help greatly appreciated. Chris

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• how to initialize a 2d array in perl

  - by Mark

  How do I initialize a 2d array in perl? I am trying the following code: 0 use strict; 10 my @frame_events = (((1) x 10), ((1) x 10)); 20 print "$frame_events[1][1]\n"; but it gives the following error: Can't use string ("1") as an ARRAY ref while "strict refs" in use at ./dyn_pf.pl line 20. This syntax only seems to initialize a 1d array as print "$frame_events[1]\n" works. Though perl doesn't give any error during the assignment.

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• How to achieve a palette effect on iPhone using OpenGL

  - by Joe

  I'm porting a 2d retro game to iPhone that has the following properties: targets OpenGL ES 1.1 entire screen is filled with tiles (textured triangle strip tile textured using a single 256x256 RGBA texture image the texture is passed to OpenGL once at the start of the game only 4 displayed colours are used one of the displayed colours is black The original game flashed the screen when time starts to run out by toggling the black pixels to white using an indexed palette. What is the best (i.e. most efficient) way to achieve this in OpenGL ES 1.1? My thoughts so far: Generate an alternative texture with white instead of black pixels, and pass to OpenGL when the screen is flashing Render a white poly underneath the background and render the texture with alpha on to display it Try and render a poly on top with some blending that achieves the effect (not sure this is possible) I'm fairly new to OpenGL so I'm not sure what the performance drawbacks of each of these are, or if there's a better way of doing this.

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• PHP 2D Array to MySQL Database

  - by Ashley Ward

  I have a PHP 2D array, many keys, each with one value, I need to put this into a MySQL database. The database has 8 fields. Eg. Field1, Field2, Field3, etc. I am trying to ensure value1 => field1, value2 =>field2, value3 => field3 and so on, when one record is full (i.e. after 8 values) a new record should be created for the next 8 values and so on. I am aware that the 1st, 9th, 17th, 26th values etc, will need an insert statement and the intermediate values will be an update statement. What is the best way of going about this?

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• Rotate a 2d matrix to the right

  - by adam

  I want a 2d matrix to rotate to the right, it compiles fine but when I try to the run it freezes. For example I want {{10,20,30},{40,50,60}} to rotate into {{40,10},{50,20},{60,30}} import java.util.*; public class Rotate{ public static int[][] rotate(int[][] m) { int [][] rotateM = new int[m[0].length][m.length]; for (int i= 0; i< m.length; i= i++){ for (int j= 0; j< m[0].length; j= j++){ rotateM[i][j] = m[j][m.length-i-1]; } } return rotateM; } public static void main(String[]args){ int[][]m = {{10,20,30}, {40,50,60}}; System.out.println(Arrays.toString(rotate(m))); } }

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• Drawing Rounded Rectangle in DirectX/3D for 2D

  - by Jengerer

  I'm using Direct3D to draw 2D elements in a C++ application of mine, and it'd be neat if I could create rounded-rectangle GUI elements that were varying in size, but I'm not sure how to do that in the most efficient manner possible. I thought of the "easy" way which would be to have images of the four corners and then just place them in the proper positions, and fill in the rest, but varying radii for the rectangle corners would be a definite plus, and this method doesn't accommodate that feature well. Through my searches I've come across the terms Pixel Shader, Stencil Buffering, and HLSL, but I'm not sure whether these terms are relevant and which one to jump into if so. Thanks in advance, Jengerer

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• iPhone - Drawing 2D Shapes

  - by Hawdon

  Hi guys! I have an array of 2D points which make an irregular polygon. What I want to do is draw the borders of it and then fill it with a color. I am using Cocos2d to code the game around, but I have not found a fill function in Cocos2d, only the ccDrawLine and such. Is there a simple way to draw filled shapes in Cocos2? I have also noted that Core Graphics would work beautifully for this purpose, but I am not able to integrate it with Cocos2d. I put this in to the draw function of my CCLayer: CGContextRef ctx = UIGraphicsGetCurrentContext(); CGContextClearRect(ctx, [[UIScreen mainScreen] bounds]); And every time I run it i get this error: <Error>: CGContextClearRect: invalid context I really need to get this working... Any ideas?

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• What is the easiest way to get MySQL's Archive Storage Engine working on CentOS 5.4

  - by tronda

  The Archive Storage Engine is not enabled by the default build of MySQL in CentOS/RHEL. I would like to enable it on our CentOS 5.4 server. My initial reaction was to modify the SPEC file for the SRPMS file, but this indicates that this might not be that easy. There's always the option to build from MySQL source, but I would prefer if possible to stay within the RPMS/Yum world. Does anybody have a successful approach to this by using RPMS/SRPMS/Yum? Some patches which makes this work flawless with SRPMS?

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• Override a Rails Engine controller action

  - by sad sheep

  Hello, i'm using a Rails engine, but i need to customize some controllers actions. I actually forked the engine, and implementing those customizations into my own fork, but i was wondering if there is an official way in Rails Engines to override and customize controllers.

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• SQL Server 2008 BIDS without the Database Engine

  - by Gareth Hill

  Does anyone know how we can install BIDS for SQL Server 2008 without having to install the Database Engine? With the SQL Server 2008 Express install it appears to be mandatory to install the Database Engine when all we would like the end users to have access to is BIDS to develop their RDL's to deploy to an existing SSRS instance? It looks like BIDS 2005 was available as a standalone download - the toolkit - however I cannot find anything similar for 2008.

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• Best reporting engine for WPF without a database?

  - by Cameron MacFarland

  Does anyone know of a Reporting Engine for WPF? Most of the ones I could find are still for WinForms. I'm happy enough using a WinForms one in WPF with a WinForms host so long as the tool has a UserControl that can be embedded in a window. Also, I'm not using a database and all my data is in XML so the Reporting Engine needs to be able to handle that. Any suggestions?

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• Adding functions to JavaScript View Engine in CouchDB 0.11

  - by fuzzy lollipop

  I want to format dates in a specific format but I can't figure out how to add my date function to the JavasScript view engine in CouchDB. Preferably I would like to add my formatDate() function to the prototype Date object so it is available everywhere Does anyone know how to add this so that the CouchDB JavaScript View engine will see it?

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• Sun Grid Engine (SGE) Jobs Not Visible After Adding virtual_free

  - by Gary Richardson

  I'm trying to to use virtual_free to limit the number of large memory jobs running each grid node in my cluster. This seems to be working as expected. After I modified my code to submit jobs with the memory instances, qstat -f -q $queueName no longer shows a list of jobs waiting for a slot. The jobs are submitted with a specific queue (-q $queueName). I'm guessing this is happening due to the magic of SGE queue selection. Is there a way to make my jobs show up as before? Thanks! UPDATE I'm using: qstat -f -u * -q $queueName to view the queue. If I drop the queue argument, I can see the jobs. If I examine a specific job, I can see that it has the correct hard_queue_list value set. I'm also using Sun Grid Engine 6.1u4

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• Reading a triangle of numbers into a 2d array of ints in Python

  - by Gabriel Silk

  I want to read a triangle of integer values from a file into a 2D array of ints using Python. The numbers would look like this: 75 95 64 17 47 82 18 35 87 10 20 04 82 47 65 ... The code I have so far is as follows: f = open('problem18.input', 'r') arr = [] for i in range(0, 15): arr.append([]) str = f.readline() a = str.split(' ') for tok in a: arr[i].append(int(tok[:2])) print arr I have a feeling this could be done in a tighter, more Pythonesque way. How would you do it?

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