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

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