ssytri(3) [debian man page]

ssytri.f(3)							      LAPACK							       ssytri.f(3)

NAME

       ssytri.f -

SYNOPSIS

   Functions/Subroutines
       subroutine ssytri (UPLO, N, A, LDA, IPIV, WORK, INFO)
	   SSYTRI

Function/Subroutine Documentation
   subroutine ssytri (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, integer, dimension( * )IPIV, real, dimension( * )WORK,
       integerINFO)
       SSYTRI

       Purpose:

	    SSYTRI computes the inverse of a real symmetric indefinite matrix
	    A using the factorization A = U*D*U**T or A = L*D*L**T computed by
	    SSYTRF.

       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 REAL array, dimension (LDA,N)
		     On entry, the block diagonal matrix D and the multipliers
		     used to obtain the factor U or L as computed by SSYTRF.

		     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 block structure of D
		     as determined by SSYTRF.

	   WORK

		     WORK is REAL array, dimension (N)

	   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 115 of file ssytri.f.

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

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

Check Out this Related Man Page

SSYTRI(l)								 )								 SSYTRI(l)

NAME

       SSYTRI  -  compute  the	inverse  of  a real symmetric indefinite matrix A using the factorization A = U*D*U**T or A = L*D*L**T computed by
       SSYTRF

SYNOPSIS

       SUBROUTINE SSYTRI( UPLO, N, A, LDA, IPIV, WORK, INFO )

	   CHARACTER	  UPLO

	   INTEGER	  INFO, LDA, N

	   INTEGER	  IPIV( * )

	   REAL 	  A( LDA, * ), WORK( * )

PURPOSE

       SSYTRI computes the inverse of a real symmetric indefinite matrix A using the factorization A =	U*D*U**T  or  A  =  L*D*L**T  computed	by
       SSYTRF.

ARGUMENTS

       UPLO    (input) 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       (input) INTEGER
	       The order of the matrix A.  N >= 0.

       A       (input/output) REAL array, dimension (LDA,N)
	       On entry, the block diagonal matrix D and the multipliers used to obtain the factor U or L as computed by SSYTRF.

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

       IPIV    (input) INTEGER array, dimension (N)
	       Details of the interchanges and the block structure of D as determined by SSYTRF.

       WORK    (workspace) REAL array, dimension (N)

       INFO    (output) 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.

LAPACK version 3.0						   15 June 2000 							 SSYTRI(l)

Linux and UNIX Man Pages

ssytri(3) [debian man page]

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