Write a method that returns the sum of all the elements in a specified row in a matrix using the following header: public static double sumRow(double[][] m, int rowIndex) Write a test program that reads a 3-by-4 matrix and displays the sum of each row. 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 row 0 is 10.5 Sum of the elements at row 1 is 26.5 Sum of the elements at row 2 is 14.5 | Numerade

Sum matching columns and rows

How to Sum Multiple Rows and Columns in Excel