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CentOS 7.0 - man page for ssytri2 (centos section 3)

ssytri2.f(3)				      LAPACK				     ssytri2.f(3)

NAME
       ssytri2.f -

SYNOPSIS
   Functions/Subroutines
       subroutine ssytri2 (UPLO, N, A, LDA, IPIV, WORK, LWORK, INFO)
	   SSYTRI2

Function/Subroutine Documentation
   subroutine ssytri2 (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, integer,
       dimension( * )IPIV, real, dimension( * )WORK, integerLWORK, integerINFO)
       SSYTRI2

       Purpose:

	    SSYTRI2 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. SSYTRI2 sets the LEADING DIMENSION of the workspace
	    before calling SSYTRI2X 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 REAL 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 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 NB structure of D
		     as determined by SSYTRF.

	   WORK

		     WORK is REAL 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:
	   September 2012

       Definition at line 128 of file ssytri2.f.

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

Version 3.4.2				 Tue Sep 25 2012			     ssytri2.f(3)


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