(Sum elements column by column) Write a method that returns the sum of all the e

Question

(Sum elements column by column)
Write a method that returns the sum of all the elements in a specified column of a matrix using the following header: public static double sumColumn(double[][] m, int columnIndex)
Write a test program that reads a 3-by-4 matrix and displays the sum of each column. Here is a sample run: Enter a 3-by-4 matrix row by row: 1.5 2 3 4 5.5 6 7 8 9.5 1 3 1 Sum of the elements at column 0 is 16.5 Sum of the elements at column 1 is 9.0 Sum of the elements at column 2 is 13.0 Sum of the elements at column 3 is 13.0

Explanation / Answer

class add_column
{
   public static double sumColumn(double[][] m, int columnIndex)
   {
       int i,j;
       double c=0;
      
           for(j=0;j<4;j++)
           {
               c=c+m[columnIndex][j];
           }
           return c;
      
   }

   public static void main(String args[])
   {
       double m[][] = {{1.5, 2, 3, 4}, {5.5, 6, 7, 8},{9.5, 1, 3, 1}};
       int i;
       double r;
       for(i=0;i<3;i++)
       {
           r=sumColumn(m,i);
           System.out.println("Sum os the elemnts at column "+i +" is "+r);
       }      
   }
}

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