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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Matrix {
  6.  
  7.     int n, m;
  8.     int[][] mainMatrix;
  9.  
  10.     public Matrix(int n, int m)
  11.     {
  12.         this.n = n;
  13.         this.m = m;
  14.         this.mainMatrix = new int[this.n][this.m];
  15.     }
  16.  
  17.     public Matrix(int [][] paramMatrix)
  18.     {
  19.         this.n = paramMatrix.length;
  20.         this.m = paramMatrix[0].length;
  21.         this.mainMatrix = paramMatrix;
  22.     }
  23.  
  24.     public int getElement(int n, int m)
  25.     {
  26.         return this.mainMatrix[n][m];
  27.     }
  28.  
  29.     public void setElement(int n, int m, int value)
  30.     {
  31.         this.mainMatrix[n][m] = value;
  32.     }
  33.  
  34.     public int getVerticalLength()
  35.     {
  36.         return this.mainMatrix.length;
  37.     }
  38.  
  39.     public int getHorizontalLength()
  40.     {
  41.         return this.mainMatrix[0].length;
  42.     }
  43.  
  44.     public void fillRandomValues()
  45.     {
  46.         Random rand = new Random();
  47.  
  48.         for(int i = 0; i < this.n; i++)
  49.         {
  50.             for(int j = 0; j < this.m; j++)
  51.             {
  52.                 this.mainMatrix[i][j] = rand.nextInt(100);
  53.             }
  54.         }
  55.     }
  56.  
  57.     public void displayMatrix()
  58.     {
  59.         for(int i = 0; i < this.n; i++)
  60.         {
  61.             for(int j = 0; j < this.m; j++)
  62.             {
  63.                 System.out.print(this.mainMatrix[i][j] + " ");
  64.             }
  65.             System.out.println();
  66.         }
  67.     }
  68.  
  69.     public static int[][] transpone(int[][] paramMatrix)
  70.     {
  71.         int[][] tmpMatrix = new int[paramMatrix[0].length][paramMatrix.length];
  72.         for(int i = 0; i < paramMatrix[0].length; i++)
  73.         {
  74.             for(int j = 0; j < paramMatrix.length; j++)
  75.             {
  76.                 tmpMatrix[i][j] = paramMatrix[j][i];
  77.             }
  78.         }
  79.         return tmpMatrix;
  80.     }
  81.  
  82.     public static Matrix transpone(Matrix paramMatrix)
  83.     {
  84.         Matrix tmpMatrix = new Matrix(paramMatrix.m, paramMatrix.n);
  85.         for(int i = 0; i < paramMatrix.m; i++)
  86.         {
  87.             for(int j = 0; j < paramMatrix.n; j++)
  88.             {
  89.                 tmpMatrix.setElement(i, j, paramMatrix.getElement(j, i));
  90.             }
  91.         }
  92.         return tmpMatrix;
  93.     }
  94.  
  95.     public static Matrix add(Matrix first, Matrix second) throws NotEqualLengthsOfMatrixException {
  96.         if(first.getVerticalLength() != second.getVerticalLength() ||
  97.                 first.getHorizontalLength() != second.getHorizontalLength())
  98.         {
  99.             throw  new NotEqualLengthsOfMatrixException();
  100.         }
  101.         else {
  102.             Matrix tmpMatrix = new Matrix(first.getVerticalLength(), second.getHorizontalLength());
  103.             for (int i = 0; i < tmpMatrix.getHorizontalLength(); i++) {
  104.                 for(int j = 0; j < tmpMatrix.getVerticalLength(); j++){
  105.                     tmpMatrix.setElement(i, j, first.getElement(i, j) + second.getElement(i, j));
  106.                 }
  107.             }
  108.             return tmpMatrix;
  109.         }
  110.     }
  111.  
  112.     public static Matrix subtract (Matrix first, Matrix second) throws NotEqualLengthsOfMatrixException {
  113.         if(first.getVerticalLength() != second.getVerticalLength() ||
  114.                 first.getHorizontalLength() != second.getHorizontalLength())
  115.             throw  new NotEqualLengthsOfMatrixException();
  116.         else {
  117.             Matrix tmpMatrix = new Matrix(first.getVerticalLength(), second.getHorizontalLength());
  118.             for (int i = 0; i < tmpMatrix.getHorizontalLength(); i++) {
  119.                 for(int j = 0; j < tmpMatrix.getVerticalLength(); j++){
  120.                     tmpMatrix.setElement(i, j, first.getElement(i, j) - second.getElement(i, j));
  121.                 }
  122.             }
  123.             return tmpMatrix;
  124.         }
  125.     }
  126.     public static Matrix multiply (Matrix first, Matrix second) throws NotEqualLengthsOfMatrixException {
  127.         if(first.getHorizontalLength() != second.getVerticalLength())
  128.             throw  new NotEqualLengthsOfMatrixException();
  129.         else {
  130.             Matrix tmpMatrix;
  131.             int n = first.getVerticalLength();
  132.             int m = second.getHorizontalLength();
  133.             int o = second.getVerticalLength();
  134.             int[][] tmpArr = new int[n][m];
  135.             for(int i = 0; i < n; i++){
  136.                 for(int j = 0; j < m; j++){
  137.                     for (int k = 0; k < o; k++) {
  138.                         tmpArr[i][j] += first.getElement(i, k) * second.getElement(k, j);
  139.                     }
  140.                 }
  141.             }
  142.             tmpMatrix = new Matrix(tmpArr);
  143.             return tmpMatrix;
  144.         }
  145.     }
  146. }
  147.  
  148.  
  149. class NotEqualLengthsOfMatrixException extends Exception {}
  150.  
  151.  
  152. class MatrixMain {
  153.  
  154.     public static void main(String[] args) throws java.lang.Exception
  155.     {
  156.         //int[][] A = {{-1, 1, -1}, {1, -1, 1}, {-1, 1, -1}};
  157.         //int[][] B = {{1, -1, 1}, {-1, 1, -1}, {1, -1, 1}};
  158.  
  159.         int[][] A =   {{33,34,12},
  160.                        {33,19,10},
  161.                        {12,14,17},
  162.                        {84,24,51},
  163.                        {43,71,21}};
  164.  
  165.         int[][] B =  {{10,11,34,55},
  166.                       {33,45,17,81},
  167.                       {45,63,12,16}};
  168.  
  169.  
  170.  
  171.  
  172.         Matrix x = new Matrix(A);
  173.         Matrix y = new Matrix(B);
  174.         x.displayMatrix();
  175.         y.displayMatrix();
  176.  
  177.         Matrix mM = Matrix.multiply(x, y);
  178.  
  179.         mM.displayMatrix();
  180.  
  181.     }
  182. }
Success #stdin #stdout 0.05s 4386816KB
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stdout
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33 34 12 
33 19 10 
12 14 17 
84 24 51 
43 71 21 
10 11 34 55 
33 45 17 81 
45 63 12 16 
1992 2649 1844 4761 
1407 1848 1565 3514 
1347 1833 850 2066 
3927 5217 3876 7380 
3718 4991 2921 8452
https://ideone.com/PvcV3O
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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