rotation 90 degrees clockwise about origin

Day4 2D array rotation 90 degrees, day4 2D array 90 degrees The rotation of a two-dimensional array is actually the reconciliation of elements in the array. There is a 4 × 4 two-dimensional array below, [0, 1, 2, 3], [0, 1, 2, 3],

the above method, the four numbers in a group are rotated, So now the question is how to completely rotate all the numbers 90 degrees and not rotate much. Continue the analysis, If n = 1, no rotation is required. N = 2, You only need to complete the 1 (a [0] [0]) rotation to complete the entire array

Use homogeneous coordinates to transform the Matrix /* Input a character matrix of N * n, rotate it counter-clockwise for 90 degrees, and then output:After calculation, the transformation matrix of the N * n square matrix Rotating 90 degrees is:0, 1, 0, 0,-1, 0-1, 0, 0

First design ideas, take 4*4 matrix as an example, it is not difficult to find in fact, if the following the same color row and column exchange, in fact, can achieve the goalIt is not difficult to find that the implementation has the following rules:i = 0j = Ai = 1j = 2, 3I= 2j = 3DATA[I][J] and Data[j][i] can be exchanged, but the exchange will think that there is a third variable to implement the way of exchange, so the implementation code is as follows:You are not mistaken, so it has been don

First design ideas, take 4*4 matrix as an example, it is not difficult to find in fact, if the following the same color row and column exchange, in fact, can achieve the goalIt is not difficult to find that the implementation has the following rules:i = 0j = Ai = 1j = 2, 3I= 2j = 3DATA[I][J] and Data[j][i] can be exchanged, but the exchange will think that there is a third variable to implement the way of exchange, so the implementation code is as follows:You are not mistaken, so it has been don

Data Structure Analysis: Two-dimensional arrays are used for Matrix storage. However, to store the converted matrix, two-dimensional arrays must be defined for storage because the rows and columns cannot be equal. Question Analysis: The key lies in column-to-column conversion. First, the rows in the original matrix are converted to converted columns. The columns in the original matrix are converted to converted rows and must be rotated 90

Windows system desktop rotates 90 degrees or 180 degrees to fix it. Sometimes we do not know touch the keyboard that button, suddenly the computer rotated 90 degrees, do not know how to set back. Below is a small compilation of how to set up in the computer's own system to r

Recursive, two-dimensional array clockwise rotation 90°, regular expression1. Recursive algorithm is a process of directly or indirectly calling its own algorithm.Characteristics: Recursion is invoking itself in a procedure or function. Explicit recursive end condition, i.e. recursive exit Concise, but not advocating Recursive number of mult

Ideas:Print along the diagonal line.Public void print_rotate_matrix (INT [] matrix, int N) {If (n School moves of the US Mission in 2014-two-dimensional array printing after 45 degrees of clockwise rotation

#include #include using namespace STD;voidGrial (int(*a) [5],intN) {//Array rotates 90 degrees clockwise. //Boundary value Considerations Let me think for a little bit. intTempintStartX =0;intStarty =0;intj =0; while(StartX 2) {StartX = J; for(inti = j; I 1; i++) {starty = i;//Do not open space, just exchange data can be easily done. temp = A[startx][star

An image is represented as a nxn matrix. each pixel in the image is 4 bytes. Write a function to rotate the image 90 degrees. Can you perform operations in the same place? (That is, do not open up additional storage space) The first question is the element of an exchange matrix: For example, 3*3 Matrices 1 2 34 5 67 8 9First, process the first line and rotate four elements counterclockwise at a time. The fo

ImportJava.util.*; Public classTransform { Public int[] Transformimage (int[] Matrix,intN) {//Write code heren =matrix.length; intLimit = (n-1)/2; for(inti=0;i){ for(intj=i;j){ inttemp =Matrix[i][j]; MATRIX[I][J]= matrix[n-1-J] [i]; Matrix[n-1-j][i] = matrix[n-1-i][n-1-J]; Matrix[n-1-I][N-1-J] = matrix[j][n-1-i]; Matrix[j][n-1-i] =temp; } } returnMatrix; }}1.6---Rotating two-dimensional array, rotating image pixels,

Initialize matrixvoidInitial_square_matrix (int* * * PM,intN) {pm[0] =New int*[n]; for(inti =0; I ) {pm[0][i] =New int[n]; for(intj =0; J ) pm[0][I][J] = i * n + j +1; }}Destroying matricesvoid Destroy_square_matrix (intint n) { for (int0 ; I ) if (NULL! = pm[0][i] )Delete[] pm[0 ][i]; Delete [] pm[0]; pm[0] = NULL;}Print matrixvoidPrint_square_matrix (int* * M,intN) {cout"------------------------------------"Endl; for(inti =0; I i) { for(intj =0; J ) cout"\ t"; c

The rotation of a two-dimensional array is actually the case of swapping elements inside the array; here is a 4x4 two-dimensional array, [[0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3], [0, 1, 2, 3]], and now requires that the two-dimensional array be converted to the following form, [[0, 0, 0, 0], [1, 1, 1, 1], [2, 2, 2, 2], [3, 3, 3, 3]]. Here's a look at the flowchart:Flow chart:Flow chart as shown above, is to carry out a simple interchange, the followi