/*************************************************************************
Copyright (c) 2005-2007, Sergey Bochkanov (ALGLIB project).

>>> SOURCE LICENSE >>>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation (www.fsf.org); either version 2 of the 
License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

A copy of the GNU General Public License is available at
http://www.fsf.org/licensing/licenses

>>> END OF LICENSE >>>
*************************************************************************/

#ifndef _det_h
#define _det_h

#include "ap.h"
#include "ialglib.h"

#include "lu.h"


/*************************************************************************
Determinant calculation of the matrix given by its LU decomposition.

Input parameters:
    A       -   LU decomposition of the matrix (output of
                RMatrixLU subroutine).
    Pivots  -   table of permutations which were made during
                the LU decomposition.
                Output of RMatrixLU subroutine.
    N       -   size of matrix A.

Result: matrix determinant.

  -- ALGLIB --
     Copyright 2005 by Bochkanov Sergey
*************************************************************************/
double rmatrixludet(const ap::real_2d_array& a,
     const ap::integer_1d_array& pivots,
     int n);


/*************************************************************************
Calculation of the determinant of a general matrix

Input parameters:
    A       -   matrix, array[0..N-1, 0..N-1]
    N       -   size of matrix A.

Result: determinant of matrix A.

  -- ALGLIB --
     Copyright 2005 by Bochkanov Sergey
*************************************************************************/
double rmatrixdet(ap::real_2d_array a, int n);


/*************************************************************************
Obsolete 1-based subroutine.
See RMatrixDetLU for 0-based replacement.
*************************************************************************/
double determinantlu(const ap::real_2d_array& a,
     const ap::integer_1d_array& pivots,
     int n);


/*************************************************************************
Obsolete 1-based subroutine.
See RMatrixDet for 0-based replacement.
*************************************************************************/
double determinant(ap::real_2d_array a, int n);


#endif

