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Код


System.out.println(matrix[i][j])

Цитата(Reptor @ 3.3.2008, 11:10

)

почему такая большая погрешность. Может как то округлять результат? Что делать. Но 0 это совсем полный бред.

Код


public static double[][] multiplicationMatrix(double[][] M1, double[][] M2){
        int rowsM1 = M1.length;
        int columnsM1 = M1[0].length;
        int rowsM2 = M2.length;
        int columnsM2 = M2[0].length;
        
        double[][] multiplication = new double[rowsM1][columnsM2];
        for(int i=0; i<rowsM1; i++){
            for(int j=0; j<columnsM2; j++){
                double [] ss = new double[columnsM1];
                for(int k=0; k<columnsM1; k++){
                    ss[k] = M2[k][j];
                }        
                multiplication[i][j] = getMultiplicationElement(M1[i], ss);
                //multiplication[i][j]=Math.round(multiplication[i][j]);
            }
        }    
        operationMatrix.printMatrix(multiplication);
        return multiplication;        
    }
    
    public static double getMultiplicationElement(double[] row, double[] column){
        int element = 0;
        
        for(int i=0; i<row.length; i++){
            element += row[i]*column[i];
        }        
        return element;
    }

Код


 public static double getMultiplicationElement(double[] row, double[] column){
        double element = 0;
        
        for(int i=0; i<row.length; i++){
            element += row[i]*column[i];
        }        
        return element;
    }

Код


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class OperationMatrix {

    static double[][] m = { { 7.12, 0.3, 2.5 }, { 4.01, 31.34, 11.45 }, { -1.23, -7.23, -5.33 },
            { 1.3, 2.2, 3.33 }, { -3.45, -2.2, -2.09 } };
    static double[][] y = { { 0.029004634440471744, 0.00825091901179591, -0.03138605643665668 },
            { 0.008250919011795914, 0.010562182383301711, -0.027503504621864853 },
            { -0.03138605643665667, -0.02750350462186485, 0.08151902688663817 } };

    public static double[][] multiplicationMatrix(double[][] M1, double[][] M2) {
        int rowsM1 = M1.length;
        int columnsM1 = M1[0].length;
        int rowsM2 = M2.length;
        int columnsM2 = M2[0].length;

        double[][] multiplication = new double[rowsM1][columnsM2];
        for (int i = 0; i < rowsM1; i++) {
            for (int j = 0; j < columnsM2; j++) {
                double[] ss = new double[columnsM1];
                for (int k = 0; k < columnsM1; k++) {
                    ss[k] = M2[k][j];
                }
                multiplication[i][j] = getMultiplicationElement(M1[i], ss);
                // multiplication[i][j]=Math.round(multiplication[i][j]);
            }
        }
        OperationMatrix.printMatrix(multiplication);
        return multiplication;
    }

    static void printMatrix(double[][] m) {
        for (int i = 0; i < m.length; i++) {
            for (int j = 0; j < m[0].length; j++) {
                System.out.print(m[i][j] + "\t");
            }
            System.out.println();
        }
    }

    public static double getMultiplicationElement(double[] row, double[] column) {
        double element = 0;

        for (int i = 0; i < row.length; i++) {
            element += row[i] * column[i];
        }
        return element;
    }

    public static void main(String[] args) {
        OperationMatrix.printMatrix(m);
        System.out.println();
        OperationMatrix.printMatrix(y);
        System.out.println();
        OperationMatrix.printMatrix(multiplicationMatrix(m,y));
    }
}