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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class TheDotProduct2D {
  6.  
  7. 	public static void main(String[] args) {
  8. 		int[][] my2D_1= {{1,3},{4,6},{15,16}};
  9. 		System.out.println("Original Vector: ");
  10. 		PrintVect2D(my2D_1);
  11.  
  12. 		int rows= my2D_1.length;
  13. 		int cols= my2D_1[0].length;
  14. 		int[][] my2D_2 = new int[cols][rows];
  15. 		my2D_2=Transpose2D(my2D_1);
  16.  
  17. 		System.out.println("\nTransposed Vector: ");
  18. 		PrintVect2D(my2D_2);
  19. 		System.out.println("\nDot Product of two Vectors: ");
  20. 		DotProd2D(my2D_1,my2D_2);
  21. 	}
  22. 	public static int[][] Transpose2D(int[][] x_arr) {
  23. 		int cols=x_arr[0].length;
  24. 		int rows=x_arr.length;
  25. 		int trans_arr[][] = new int[cols][rows];
  26. 		for(int i=0; i<rows; i++) {
  27. 			for(int j=0; j<cols; j++) {
  28. 				trans_arr[j][i]=x_arr[i][j];
  29. 			}
  30. 		}
  31. 		return (trans_arr);
  32. 	}
  33.  
  34. 	// your code here for new method DotProd()
  35. 	public static void DotProd2D(int[][] x, int[][] y) {
  36. 		int row = x.length;
  37. 		int col = y[0].length;
  38. 		int temp[][]=new int[row][col]; 
  39. 			for(int i=0;i<row;i++){ 
  40. 				for(int j=0;j<col;j++){    
  41. 					temp[i][j]=0;      
  42. 				for(int k=0;k<x[1].length;k++){    
  43. 			temp[i][j]+=x[i][k]*y[k][j];      
  44. 				} 
  45. 			} 
  46. 		}
  47. 	PrintVect2D(temp);
  48. 	return;
  49. 	}
  50.  
  51. 	public static void PrintVect2D(int[][] vect) {
  52. 		System.out.print("{ ");
  53. 		for(int i=0; i<vect.length; i++) {
  54. 			if(i>0)
  55. 				System.out.print("  ");
  56. 			for(int j=0; j<vect[0].length; j++) {
  57. 				if(j<vect[0].length-1)
  58. 					System.out.print(vect[i][j]+", ");
  59. 				else
  60. 					System.out.print(vect[i][j]);
  61. 			}
  62. 			if(i<vect.length-1)
  63. 				System.out.println("");
  64. 			else
  65. 				System.out.println(" }");
  66. 		}
  67. 	}
  68. }
Success #stdin #stdout 0.12s 48008KB
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stdin
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Standard input is empty
stdout
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Original Vector: 
{ 1, 3
  4, 6
  15, 16 }

Transposed Vector: 
{ 1, 4, 15
  3, 6, 16 }

Dot Product of two Vectors: 
{ 10, 22, 63
  22, 52, 156
  63, 156, 481 }
https://ideone.com/OKTcAH
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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