matA: 
The matA is not symmetry and regular.

matB: 
 K = 1 	 Determinant = 3
 K = 2	 Determinant = 15
 K = 3	 Determinant = 13
Determinant(matB) = 13
        1.73205               0               0 
       -1.73205         2.23607               0 
        -1.1547        0.894427        0.930949 

matC: 
 K = 1 	 Determinant = 5
 K = 2	 Determinant = 1
 K = 3	 Determinant = 2
 K = 4	 Determinant = 1
Determinant(matC) = 1
        2.23607               0               0               0 
         3.1305        0.447214               0               0 
        2.68328       -0.894427         1.41421               0 
        2.23607               0         2.12132        0.707107