Android Open Source - simple-matrix Basic

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License

The source code is released under:

MIT License

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Java Source Code

package com.alexkang.x3matrixcalculator.calculations;
/* ww  w.  j  a  v  a 2  s . co m*/
public class Basic {

  public static double[][] transpose(double[][] matrix) {
    double[][] result = new double[matrix.length][matrix[0].length];
    
    for (int i=0; i<matrix.length; i++) {
      for (int j=0; j<matrix[0].length; j++) {
        result[j][i] = matrix[i][j];
      }
    }
    
    return result;
  }
  
  public static double[][] add(double[][] matrix1, double[][] matrix2) {
    double[][] sum = new double[matrix1.length][matrix1[0].length];
    for (int i=0; i<sum.length; i++) {
      for (int j=0; j<sum[0].length; j++) {
      sum[i][j] = Math.round((matrix1[i][j] + matrix2[i][j]) * 1000.0) / 1000.0;
      }
    }
    return sum;
  }
  
  public static double[][] sub(double[][] matrix1, double[][] matrix2) {
    for (int i=0; i<matrix2.length; i++) {
      for (int j=0; j<matrix2[0].length; j++) {
        matrix2[i][j] = -1 * matrix2[i][j];
      }
    }
    return add(matrix1, matrix2);
  }
  
  public static double[][] mul(double[][] matrix1, double[][] matrix2) {
    double[][] product = new double[matrix1.length][matrix2[0].length];
    
    for (int i=0; i<matrix1.length; i++) {
      for (int j=0; j<matrix2[0].length; j++) {
        double element = 0;
        for (int k=0; k<matrix1[0].length; k++) {
          element += matrix1[i][k] * matrix2[k][j];
        }
        product[i][j] = Math.round(element * 1000.0) / 1000.0;
      }
    }
    
    return product;
  }
}

Java Source Code List