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  1.  
  2. class Matrix {
  3.  
  4.     private int a[][];
  5.  
  6.     public Matrix(int n, int m) {
  7.         a = new int[n][m];
  8.     }
  9.  
  10.     public Matrix(int a[][]) {
  11.         this.a = a;
  12.     }
  13.  
  14.     public int getVerticalSize() {
  15.         return a.length;
  16.     }
  17.  
  18.     public int getHorizontalSize() {
  19.         return a[0].length;
  20.     }
  21.  
  22.     public int getElement(int i, int j) {
  23.         return a[i][j];
  24.     }
  25.  
  26.     public void setElement(int i, int j, int value) {
  27.         a[i][j] = value;
  28.     }
  29.  
  30.     @Override
  31.     public String toString() {
  32.         String s = "\n";
  33.         for (int[] vector : a) {
  34.             for (int value : vector)
  35.                 s += value + " ";
  36.             s += "\n";
  37.         }
  38.         return s;
  39.     }
  40.  
  41.     public static Matrix add(Matrix a, Matrix b) {
  42.         int v = a.getVerticalSize();
  43.         int h = a.getHorizontalSize();
  44.         Matrix result = new Matrix(v, h);
  45.  
  46.         for (int i = 0; i < h; i++) {
  47.             for (int j = 0; j < v; j++) {
  48.                 int value = 0;
  49.                 value = a.getElement(i, j) + b.getElement(i, j);
  50.                 result.setElement(i, j, value);
  51.             }
  52.         }
  53.         return result;
  54.     }
  55.  
  56.     public static Matrix subtract(Matrix a, Matrix b) {
  57.         int v = a.getVerticalSize();
  58.         int h = a.getHorizontalSize();
  59.         Matrix result = new Matrix(v, h);
  60.  
  61.         for (int i = 0; i < h; i++) {
  62.             for (int j = 0; j < v; j++) {
  63.                 int value = 0;
  64.                 value = a.getElement(i, j) - b.getElement(i, j);
  65.                 result.setElement(i, j, value);
  66.             }
  67.         }
  68.         return result;
  69.     }
  70.  
  71.     public static Matrix multiply(Matrix a, Matrix b) {
  72.         int v = a.getVerticalSize();
  73.         int h = b.getHorizontalSize();
  74.         int temp = a.getHorizontalSize();
  75.  
  76.         Matrix result = new Matrix(v, h);
  77.  
  78.         for (int i = 0; i < v; i++)
  79.             for (int j = 0; j < h; j++) {
  80.                 int value = 0;
  81.                 for (int k = 0; k < temp; k++) {
  82.                     value += a.getElement(i, k) * b.getElement(k, j);
  83.                 }
  84.                 result.setElement(i, j, value);
  85.             }
  86.         return result;
  87.     }
  88.  
  89.     public void transMatrix() {
  90.         int x = a.length;
  91.         int retA[][] = new int[x][x];
  92.         for (int i = 0; i < x; i++) {
  93.             for (int j = 0; j < x; j++) {
  94.                 retA[j][i] = a[i][j];
  95.             }
  96.         }
  97.         for (int i = 0; i < a.length; i++) {
  98.             System.arraycopy(retA[i], 0, a[i], 0, a.length);
  99.         }
  100.     }
  101.  
  102.     public static void main(String[] args) {
  103.  
  104.         int[][] a = {{-9, 1, 0}, {4, 1, 1}, {-2, 2, -1}};
  105.         int[][] b = {{0, 0, 0}, {0, 2, 0}, {0, 0, 1}};
  106.  
  107.         Matrix A = new Matrix(a);
  108.         System.out.println("A" + A);
  109.         System.out.println("Element [0,0] : " + A.getElement(0, 0));
  110.  
  111.         Matrix B = new Matrix(b);
  112.         B.setElement(0, 0, 1);
  113.         System.out.println("Size of matrix B : " + B.getHorizontalSize() + " " + B.getVerticalSize() + B);
  114.  
  115.         Matrix C;
  116.         C = add(A, B);
  117.         System.out.println("add " + C);
  118.  
  119.         C = subtract(A, B);
  120.         System.out.println("subtract " + C);
  121.  
  122.         C = multiply(A, B);
  123.         System.out.println("multiply " + C);
  124.  
  125.         A.transMatrix();
  126.         System.out.println("Transposed A : " + A);
  127.  
  128.     }
  129. }
  130.  
Success #stdin #stdout 0.03s 320576KB
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Standard input is empty
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A
-9 1 0 
4 1 1 
-2 2 -1 

Element [0,0] : -9
Size of matrix B : 3 3
1 0 0 
0 2 0 
0 0 1 

add 
-8 1 0 
4 3 1 
-2 2 0 

subtract 
-10 1 0 
4 -1 1 
-2 2 -2 

multiply 
-9 2 0 
4 2 1 
-2 4 -1 

Transposed A : 
-9 4 -2 
1 1 2 
0 1 -1
https://ideone.com/vC5j6F
language:
Java (12.0.1)
created:
8 years ago
visibility:
public

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