Task is to write two methods that use a two-dimensional array as input and retur

Question

Task is to write two methods that use a two-dimensional array as input and return a one-dimensional array that contains the row-by-row average or the column-by-column average, as directed. Name your class TwoDaverage, which shall contain the two methods described below.

ROW-BY-ROW AVERAGE
Name this method rowAverage. The input parameter for rowAverage() is a rectangular, two-dimensional array of doubles. rowAverage() returns a one-dimensional array of doubles whose length is the number of rows in the two-dimensional input array and whose values are the averages of each row. For example, the zeroth element of the one-dimensional array that is returned is the average of all the values in the zeroth row of the two-dimensional array.
Be sure to include Javadoc comments for your method.

COLUMN-BY-COLUMN AVERAGE
Name this method columnAverage. The input parameter is the same as for rowAverage(). columnAverage() returns a one-dimensional array of doubles whose length is the number of columns in the two-dimensional input array and whose values are the averages of each column.
Be sure to include Javadoc comments for your method.

Explanation / Answer

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import java.util.*;
    public class main
   {
      public static void main(String[] args)
      {Scanner in = new Scanner(System.in);
        int n,i,j,m;
        System.out.println("Enter rows in the matrix: ");
        n=in.nextInt();
        System.out.println("Enter columns in the matrix: ");
        m=in.nextInt();   
        double [][] a = new double [n][m];
        for(i=0;i<n;i++)
           for(j=0;j<m;j++)
               a[i][j]=Math.random()*100.;
        System.out.println("The starting matrices:");
        for(i=0;i<n;i++)
           {for(j=0;j<m;j++)
               System.out.printf("%5f ",a[i][j]);
            System.out.println();
                    }
        double b[]=rowAverage(a);   
        System.out.println("Row averages");
        for(i=0;i<b.length;i++)
            System.out.printf("%5f ",b[i]);
        System.out.println();
        double c[]=columnAverage(a);
        System.out.println("Column averages");
        for(i=0;i<c.length;i++)
            System.out.printf("%5f ",c[i]);
        System.out.println();
   
    }
public static double[] rowAverage(double a[][])
    {int i,j;
    double sum;
    double b[]=new double[a.length];
    for(i=0;i<a.length;i++)
        {sum=0;
        for(j=0;j<a[0].length;j++)
              sum+=a[i][j];
        b[i]=sum/a[0].length;
        }
    return b;
    }
public static double[] columnAverage(double a[][])
    {int i,j;
    double sum;
    double b[]=new double[a[0].length];
    for(i=0;i<a[0].length;i++)
        {sum=0;
        for(j=0;j<a.length;j++)
              sum+=a[j][i];
        b[i]=sum/a.length;
        }
    return b;
    }
   
}

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