Matrix Inversion via Gaussian Elimination with Partial Pivoting.

 Version 1.1,  October 27, 1999

 by Tom Irvine
 Email:  tomirvine@aol.com

 The input matrix has dimension n x n.

 Enter n
2


 Select data entry method:  1=keyboard  2=input file
1

 Enter a[1][1]
1

 Enter a[1][2]
2

 Enter a[2][1]
3

 Enter a[2][2]
4


 Determinant of input matrix  = -2.00000e+000


 Inverse Matrix

-2.00000e+000   1.00000e+000
1.50000e+000    -5.00000e-001


 Determinant of inverse matrix  = -5.00000e-001

 Error Analysis:
 Input Matrix x Inverse Matrix (should equal identity matrix).

1.00000e+000    1.11022e-016
0.00000e+000    1.00000e+000

 Determinant of error matrix  = 1.00000e+000


 Input data written to file:    inv_data.in
 Output data written to file:   inv_data.out
 Error matrix written to file:  inv_err.out