Create a data file double3.txt containing floating point numbers in a two dimensional array suitable for use in Exercise 15. The numbers in each row should be comma separated. Write a method that...

Create a data file double3.txt containing floating point numbers in a two dimensional array suitable for use in Exercise 15. The numbers in each row should be comma separated. Write a method that invokes the functions in that exercise on the data in your file. If your code in Exercise 15 requires that the two-dimensional array be rectangular, then throw an exception if the data file does not represent a rectangular array, prior to invoking your method.