debian man page for zsytri2

zsytri2.f(3)							      LAPACK							      zsytri2.f(3)

NAME
       zsytri2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine zsytri2 (UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
	   ZSYTRI2

Function/Subroutine Documentation
   subroutine zsytri2 (characterUPLO, integerN, complex*16, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, complex*16, dimension(
       * )WORK, integerLWORK, integerINFO)
       ZSYTRI2

       Purpose:

	    ZSYTRI2 computes the inverse of a COMPLEX*16 hermitian indefinite matrix
	    A using the factorization A = U*D*U**T or A = L*D*L**T computed by
	    ZSYTRF. ZSYTRI2 sets the LEADING DIMENSION of the workspace
	    before calling ZSYTRI2X that actually computes the inverse.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		     Specifies whether the details of the factorization are stored
		     as an upper or lower triangular matrix.
		     = 'U':  Upper triangular, form is A = U*D*U**T;
		     = 'L':  Lower triangular, form is A = L*D*L**T.

	   N

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

	   A

		     A is COMPLEX*16 array, dimension (LDA,N)
		     On entry, the NB diagonal matrix D and the multipliers
		     used to obtain the factor U or L as computed by ZSYTRF.

		     On exit, if INFO = 0, the (symmetric) inverse of the original
		     matrix.  If UPLO = 'U', the upper triangular part of the
		     inverse is formed and the part of A below the diagonal is not
		     referenced; if UPLO = 'L' the lower triangular part of the
		     inverse is formed and the part of A above the diagonal is
		     not referenced.

	   LDA

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

	   IPIV

		     IPIV is INTEGER array, dimension (N)
		     Details of the interchanges and the NB structure of D
		     as determined by ZSYTRF.

	   WORK

		     WORK is COMPLEX*16 array, dimension (N+NB+1)*(NB+3)

	   LWORK

		     LWORK is INTEGER
		     The dimension of the array WORK.
		     WORK is size >= (N+NB+1)*(NB+3)
		     If LDWORK = -1, then a workspace query is assumed; the routine
		      calculates:
			 - the optimal size of the WORK array, returns
		     this value as the first entry of the WORK array,
			 - and no error message related to LDWORK is issued by XERBLA.

	   INFO

		     INFO is INTEGER
		     = 0: successful exit
		     < 0: if INFO = -i, the i-th argument had an illegal value
		     > 0: if INFO = i, D(i,i) = 0; the matrix is singular and its
			  inverse could not be computed.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 128 of file zsytri2.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.1							  Sun May 26 2013						      zsytri2.f(3)