>>> main()

   1.00    2.00    3.00    4.00 
   5.00    6.00    7.00    8.00 
   9.00   10.00   11.00   12.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 2
Index of row: 1
Multiplier: 4

   1.00    2.00    3.00    4.00 
  20.00   24.00   28.00   32.00 
   9.00   10.00   11.00   12.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 3
Index of source row: 1
Index of destination row: 2

   1.00    2.00    3.00    4.00 
  20.00   24.00   28.00   32.00 
  29.00   34.00   39.00   44.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 0
Enter a new 2-D list of numbers: [[1,2],[3,4],[5,6],[7,8]]

   1.00    2.00 
   3.00    4.00 
   5.00    6.00 
   7.00    8.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 4
Index of source row: 1
Index of destination row: 3
Multiplier: 4

   1.00    2.00 
   3.00    4.00 
   5.00    6.00 
  19.00   24.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 5

   1.00    3.00    5.00   19.00 
   2.00    4.00    6.00   24.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 5

   1.00    2.00 
   3.00    4.00 
   5.00    6.00 
  19.00   24.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 2
Index of row: 2
Multiplier: 0.5

   1.00    2.00 
   3.00    4.00 
   2.50    3.00 
  19.00   24.00 

(0) Enter a new matrix
(1) Negate the matrix
(2) Multiply a row by a constant
(3) Add one row to another
(4) Add a multiple of one row to another
(5) Transpose the matrix
(6) Quit

Enter your choice: 6
>>>