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Thread: Hey guys I need some help

  1. #1
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    Default Hey guys I need some help



    import java.util.Scanner;
    public class Matrix {
     
     
    public static void main(String[] args) {
     
    Scanner scan = new Scanner(System.in);
     
    double[][] matrix = new double[3][4];
    System.out.println("Enter a " + matrix.length + "-by-" + matrix[0].length + " matrix row by row:"  );
     
    for (int row = 0; row < matrix.length; row++) {
    for (int column = 0; column < matrix[row].length; column++) {
     
     
    matrix[row][column] = scan.nextDouble();
    System.out.print(matrix[row][column] + " ");
    }
    System.out.println();
    }                        
    for (int i = 0; i < 4; i++) {
    System.out.println("Sum of column " + i + " is " + sumColumn(matrix, i));
    }
    }
     
    public static double sumColumn(double[][] m, int columnIndex) {
    double sum = 0;
    for (int i = 0; i < m.length; i++) {
    sum += m[i][columnIndex];
    }
    return sum;
    }
    }

    what did I do wrong?
    Last edited by kenamine; October 25th, 2012 at 10:49 PM.


  2. #2
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    Default Re: Hey guys I need some help

    I get

  3. #3
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    Default Re: Hey guys I need some help

    nvm I got it now!
     import java.util.Scanner;
    public class Matrix {
     
     
    public static void main(String[] args) {
     
    Scanner input = new Scanner(System.in);
     
    double[][] matrix = new double[3][4];
    System.out.println("Enter a " + matrix.length + "-by-" + matrix[0].length + " matrix row by row:"  );
     
    for (int row = 0; row < matrix.length; row++) {
    for (int column = 0; column < matrix[row].length; column++) {
     
     
    matrix[row][column] = input.nextDouble();
     
       }
    }                        
    for (int i = 0; i < 4; i++) {
    System.out.println("Sum of column " + i + " is " + sumColumn(matrix, i));
    }
    }
     
    public static double sumColumn(double[][] m, int columnIndex) {
    double sum = 0;
    for (int i = 0; i < m.length; i++) {
    sum += m[i][columnIndex];
    }
    return sum;
    }
    }

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