MxDet

Matrix functions 
SYNTAX  MxDet( mx, method = 0 ) 
RETURNS  NUMBER 
FUNCTION  The function calculates determinant of the matrix
LU decomposition is fast but subject to higher numerical errors. "Slow" method is slower yet produces much more reliable results. For example Octave/MatLab that use LU decomposition would say that determinant of singular matrix like this { {16, 2, 3, 13}, { 5, 11, 10, 8}, {9, 7, 6, 12}, {4, 14, 15, 1 } } is 1.4495e012 due to roundoff errors of LU method. If you want to calculate determinant using fast (LU decomposition) method, call MxDet with fast parameter set to 2. CAVEAT: Laplace method has complexity of O(N!) and for this reason, even if you use method = 1, the maximum dimension for this method is limited to 10x10. Matrices larger than that are always calculated using LU method 
EXAMPLE  
SEE ALSO  Matrix() function , MxSolve() function 
The MxDet function is used in the following formulas in AFL online library: