轉置雙[] []矩陣與Java函數？

Question

不要任何人有，我可以轉用Java的基質中有如下形式的函數：

double[][] 

我有這樣的功能：某處

public static double[][] transposeMatrix(double [][] m){ 
    for (int i = 0; i < m.length; i++) { 
     for (int j = i+1; j < m[0].length; j++) { 
      double temp = m[i][j]; 
      m[i][j] = m[j][i]; 
      m[j][i] = temp; 
     } 
    } 

    return m; 
} 

但它是錯誤的。

Answer 1

public static double[][] transposeMatrix(double [][] m){ 
     double[][] temp = new double[m[0].length][m.length]; 
     for (int i = 0; i < m.length; i++) 
      for (int j = 0; j < m[0].length; j++) 
       temp[j][i] = m[i][j]; 
     return temp; 
    } 

Answer 2

的Java類矩陣轉置： -

import java.util.Scanner; 

public class Transpose { 

    /** 
    * @param args 
    */ 

    static int col; 
    static int row; 
    static int[][] trans_arr = new int[col][row]; 

    public static void main(String[] args) { 
     // TODO Auto-generated method stub 

     Scanner sc = new Scanner(System.in); 
     int m = sc.nextInt(); 
     col = m; 
     int n = sc.nextInt(); 
     row = n; 

     int[][] arr = new int[row][col]; 
     for (int i = 0; i < row; i++) { 
      for (int j = 0; j < col; j++) { 
       arr[i][j] = sc.nextInt(); 
       System.out.print(arr[i][j] + " "); 
      } 
      System.out.println(); 
     } 
     int[][] trans_arr = new int[col][row]; 
     for (int i = 0; i < row; i++) { 
      for (int j = 0; j < col; j++) { 
       trans_arr[j][i] = arr[i][j]; 
      } 
     } 
     for (int i = 0; i < col; i++) { 
      for (int j = 0; j < row; j++) { 
       System.out.print(trans_arr[i][j] + " "); 

      } 
      System.out.println(); 
     } 

    } 

} 

Answer 3

如果你想使用一個外部庫，Apache的百科全書數學提供了矩陣轉置的效用。請參閱official site。

首先，您必須創建一個雙數組double[][] arr，正如您已經完成的那樣。然後，轉置2D矩陣可以這樣

MatrixUtils.createRealMatrix(arr).transpose().getData()