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dgetrf.f(3)				      LAPACK				      dgetrf.f(3)

       dgetrf.f -

       subroutine dgetrf (M, N, A, LDA, IPIV, INFO)

Function/Subroutine Documentation
   subroutine dgetrf (integerM, integerN, double precision, dimension( lda, * )A, integerLDA,
       integer, dimension( * )IPIV, integerINFO)


	    DGETRF computes an LU factorization of a general M-by-N matrix A
	    using partial pivoting with row interchanges.

	    The factorization has the form
	       A = P * L * U
	    where P is a permutation matrix, L is lower triangular with unit
	    diagonal elements (lower trapezoidal if m > n), and U is upper
	    triangular (upper trapezoidal if m < n).

	    This is the right-looking Level 3 BLAS version of the algorithm.


		     M is INTEGER
		     The number of rows of the matrix A.  M >= 0.


		     N is INTEGER
		     The number of columns of the matrix A.  N >= 0.


		     A is DOUBLE PRECISION array, dimension (LDA,N)
		     On entry, the M-by-N matrix to be factored.
		     On exit, the factors L and U from the factorization
		     A = P*L*U; the unit diagonal elements of L are not stored.


		     LDA is INTEGER
		     The leading dimension of the array A.  LDA >= max(1,M).


		     IPIV is INTEGER array, dimension (min(M,N))
		     The pivot indices; for 1 <= i <= min(M,N), row i of the
		     matrix was interchanged with row IPIV(i).


		     INFO is INTEGER
		     = 0:  successful exit
		     < 0:  if INFO = -i, the i-th argument had an illegal value
		     > 0:  if INFO = i, U(i,i) is exactly zero. The factorization
			   has been completed, but the factor U is exactly
			   singular, and division by zero will occur if it is used
			   to solve a system of equations.

	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

	   November 2011

       Definition at line 109 of file dgetrf.f.

       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2				 Tue Sep 25 2012			      dgetrf.f(3)
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