2d

问题 I am trying to format an array that is the following: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] How could I initialize the two dimensional array and the values using nested for loops? 回答1: I think you have a misunderstanding of two dimensional arrays. Think of them beeing arrays containing arrays. if you really want this: [[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15]] You could initialize it like that: int[][] array2d = new int[15][1] for (int i =

问题 I have to store two types of information in any data structure for what I came up with the scrap solution of 2D array in C#. I have to store as: number of cluster in int data type cluster membership count in int data type If I use a 2D array as: Int32[,] _clusterMembership = new Int32[10, 10]; But the issue here is: I don't know what total number of cluster will be? I don't know what number of members each cluster will have? So the question is: How can I manage to store this information in C#

问题 I am trying to move an image around in openGL while holding left mouse button. i am NOT trying to drag an object around, just move the whole picture. Its a 2d drawing of a fractal and i was told that i can use gluortho2d but i can't find any info or similar tries on how to do it. I am assuming something like void mouse_callback_func(int button, int state, int x, int y) { if (button == GLUT_LEFT_BUTTON && state == GLUT_DOWN) gluOrtho2D(x-250.0, x+250.0, y-250.0,y+250.); glutPostRedisplay(); }

问题 I'm supposed to write a method that creates a 2d matrix from an array, for instance: ({1, 2, 3, 4}, 3) should return the matrix {{1, 2, 3}, {4}} public class Matrix { public static int[][]toM(int[] array, int a) { int[][]matrix = new int [(array.length + a- 1)/ a][a]; for (int i = 0; i < array.length; i++){ int value = array[i]; value = value++; for (int row = 0; row < (array.length + a- 1)/a; row++) { for (int col = 0; col < a; col++) { matrix[row][col]= value++; } } } return matrix; } } a

问题 l would like to create a dynamic 2D matrix, where the number of rows and columns is unknown. Filling it by adding one element at the time. For example, 1st button click = M[1][1] (at this time, the matrix contains only this element), then M[1][2], [1][3]....etc. 回答1: Use collections to do this. For example: List<List<Integer>> dynamic2D = new ArrayList<List<Integer>>(); dynamic2D.add(new ArrayList<Integer>()); dynamic2D.add(new ArrayList<Integer>()); dynamic2D.add(new ArrayList<Integer>());

问题 User, I want to crop that Triangle on the image and show it in another window with opencv c++. I know all three Coordinates. Can anyone help me? I did not find any answer on the Internet about "triangle cropping". Thanks! EDIT: The Problem here is that i cannot use ROI for cropping the Triangle. I have to copy just the triangle without any background or something around. Is it possible to create my own ROI by knowing the Coordinates of the triangle [p1(302,179), p2(329,178), p3(315,205)]? 回答1

问题 I'm currently trying to understand the 2d fourier shift theorem. According to what I've learnd so far a translation in the image space leads to differences in phase but not the magnitude in frequency space. I tried to demonstrate this with a little example but it only worked for shifts in rows but not in columns. Here's the little demo (I'm only showing the magnitude plots here) clear all close all Iin = zeros(128); Iin(10:20,10:20)=1; figure,imagesc(Iin) Y = fft(Iin); figure, imagesc

问题 I would like to render an SVG I've created to a hi-res (600 DPI) PNG. This SVG has filter effects, specifically gaussian blur. Ideally rendering could be done via the command line. I know the SVG is renderable because you can open it in Chrome/Chromium and the output I'd like to see is there . Things I've tried: Importing to Adobe Illustrator svg2png Imagemagick Inkscape Other command-line tools and programs I'm forgetting right now. Basically anything you could find with Google. Current path

问题 In my 2D grid made of JLabel as cells, I have cell's neighbors forming a "path", then draw a polygon following that path having the center of cells as Points. I use a layered pane (JPanel) to hold two panels one on top of the other to be able to draw polygons on and a GridBagLayout to allow placing two components one on top of the other. Everything works as expected. The problem is, whenever I click on an empty cell, the previous path is cleared, clearing the polygon as well. However cells

问题 So I have a system with colliding balls that generally works, except for when they collide with similar directions, less than 90 degrees apart. This is because the ball above tries to collide against the yellow line which is supposedly the collision plane, but it sends it off the wrong direction, and it "follows" the other ball. The general algorithm for the collision is: dot = direction.surface; parallel = surface * dot; perpendicular = direction - parallel; direction = perpendicular -