ssytri_rook (3p)

Name

ssytri_rook - 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_ROOK

Synopsis

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

CHARACTER*1 UPLO
INTEGER N, LDA, INFO
INTEGER IPIV(*)
REAL A(LDA,*), WORK(*)

SUBROUTINE SSYTRI_ROOK_64(UPLO, N, A, LDA, IPIV, WORK, INFO)

CHARACTER*1 UPLO
INTEGER*8 N, LDA, INFO
INTEGER*8 IPIV(*)
REAL A(LDA,*), WORK(*)




F95 INTERFACE
SUBROUTINE SYTRI_ROOK(UPLO, N, A, LDA, IPIV, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
INTEGER :: N, LDA, INFO
INTEGER, DIMENSION(:) :: IPIV
REAL, DIMENSION(:) :: WORK
REAL, DIMENSION(:,:) :: A

SUBROUTINE SYTRI_ROOK_64(UPLO, N, A, LDA, IPIV, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
INTEGER(8) :: N, LDA, INFO
INTEGER(8), DIMENSION(:) :: IPIV
REAL, DIMENSION(:) :: WORK
REAL, DIMENSION(:,:) :: A




C INTERFACE
#include <sunperf.h>

void  ssytri_rook(char  uplo,  int n, float *a, int lda, int *ipiv, int
*info);

void ssytri_rook_64(char uplo, long n, float *a, long lda, long  *ipiv,
long *info);

Description

Oracle Solaris Studio Performance Library                      ssytri_rook(3P)



NAME
       ssytri_rook - 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_ROOK


SYNOPSIS
       SUBROUTINE SSYTRI_ROOK(UPLO, N, A, LDA, IPIV, WORK, INFO)

       CHARACTER*1 UPLO
       INTEGER N, LDA, INFO
       INTEGER IPIV(*)
       REAL A(LDA,*), WORK(*)

       SUBROUTINE SSYTRI_ROOK_64(UPLO, N, A, LDA, IPIV, WORK, INFO)

       CHARACTER*1 UPLO
       INTEGER*8 N, LDA, INFO
       INTEGER*8 IPIV(*)
       REAL A(LDA,*), WORK(*)




   F95 INTERFACE
       SUBROUTINE SYTRI_ROOK(UPLO, N, A, LDA, IPIV, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       INTEGER :: N, LDA, INFO
       INTEGER, DIMENSION(:) :: IPIV
       REAL, DIMENSION(:) :: WORK
       REAL, DIMENSION(:,:) :: A

       SUBROUTINE SYTRI_ROOK_64(UPLO, N, A, LDA, IPIV, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       INTEGER(8) :: N, LDA, INFO
       INTEGER(8), DIMENSION(:) :: IPIV
       REAL, DIMENSION(:) :: WORK
       REAL, DIMENSION(:,:) :: A




   C INTERFACE
       #include <sunperf.h>

       void  ssytri_rook(char  uplo,  int n, float *a, int lda, int *ipiv, int
                 *info);

       void ssytri_rook_64(char uplo, long n, float *a, long lda, long  *ipiv,
                 long *info);



PURPOSE
       ssytri_rook  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_ROOK.


ARGUMENTS
       UPLO (input)
                 Specifies whether the details of the factorization are stored
                 as an upper or lower triangular matrix.  = 'U':  Upper trian-
                 gular, form is A = U*D*U**T;
                 = 'L':  Lower triangular, form is A = L*D*L**T.


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


       A (input/output)
                 On  entry,  the  block  diagonal matrix D and the multipliers
                 used to obtain the factor U or L as computed by  SSYTRF_ROOK.

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


       IPIV (input)
                 Details of the interchanges and the block structure of  D  as
                 determined by SSYTRF_ROOK.


       WORK (workspace)
                 dimension(N)

       INFO (output)
                 = 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.




                                  7 Nov 2015                   ssytri_rook(3P)