dsytri2x (3p)

Name

dsytri2x - compute the inverse of a real symmetric indefinite matrix A using the factorization computed by DSYTRF

Synopsis

SUBROUTINE DSYTRI2X(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


CHARACTER*1 UPLO

INTEGER INFO, LDA, N, NB

INTEGER IPIV(*)

DOUBLE PRECISION A(LDA,*), WORK(N+NB+1,*)


SUBROUTINE DSYTRI2X_64(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


CHARACTER*1 UPLO

INTEGER*8 INFO, LDA, N, NB

INTEGER*8 IPIV(*)

DOUBLE PRECISION A(LDA,*), WORK(N+NB+1,*)


F95 INTERFACE
SUBROUTINE SYTRI2X(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


INTEGER :: N, LDA, NB, INFO

CHARACTER(LEN=1) :: UPLO

INTEGER, DIMENSION(:) :: IPIV

REAL(8), DIMENSION(:,:) :: A

REAL(8), DIMENSION(:) :: WORK


SUBROUTINE SYTRI2X_64(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


INTEGER(8) :: N, LDA, NB, INFO

CHARACTER(LEN=1) :: UPLO

INTEGER(8), DIMENSION(:) :: IPIV

REAL(8), DIMENSION(:,:) :: A

REAL(8), DIMENSION(:) :: WORK


C INTERFACE
#include <sunperf.h>

void dsytri2x (char uplo, int n, double *a, int lda, int *ipiv, int nb,
int *info);


void  dsytri2x_64  (char uplo, long n, double *a, long lda, long *ipiv,
long nb, long *info);

Description

Oracle Solaris Studio Performance Library                         dsytri2x(3P)



NAME
       dsytri2x  - compute the inverse of a real symmetric indefinite matrix A
       using the factorization computed by DSYTRF


SYNOPSIS
       SUBROUTINE DSYTRI2X(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


       CHARACTER*1 UPLO

       INTEGER INFO, LDA, N, NB

       INTEGER IPIV(*)

       DOUBLE PRECISION A(LDA,*), WORK(N+NB+1,*)


       SUBROUTINE DSYTRI2X_64(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


       CHARACTER*1 UPLO

       INTEGER*8 INFO, LDA, N, NB

       INTEGER*8 IPIV(*)

       DOUBLE PRECISION A(LDA,*), WORK(N+NB+1,*)


   F95 INTERFACE
       SUBROUTINE SYTRI2X(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


       INTEGER :: N, LDA, NB, INFO

       CHARACTER(LEN=1) :: UPLO

       INTEGER, DIMENSION(:) :: IPIV

       REAL(8), DIMENSION(:,:) :: A

       REAL(8), DIMENSION(:) :: WORK


       SUBROUTINE SYTRI2X_64(UPLO, N, A, LDA, IPIV, WORK, NB, INFO)


       INTEGER(8) :: N, LDA, NB, INFO

       CHARACTER(LEN=1) :: UPLO

       INTEGER(8), DIMENSION(:) :: IPIV

       REAL(8), DIMENSION(:,:) :: A

       REAL(8), DIMENSION(:) :: WORK


   C INTERFACE
       #include <sunperf.h>

       void dsytri2x (char uplo, int n, double *a, int lda, int *ipiv, int nb,
                 int *info);


       void  dsytri2x_64  (char uplo, long n, double *a, long lda, long *ipiv,
                 long nb, long *info);


PURPOSE
       dsytri2x 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
       DSYTRF.


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


       A (input/output)
                 A is DOUBLE PRECISION array, dimension (LDA,N)
                 On  entry, the NNB diagonal matrix D and the multipliers used
                 to obtain the factor U or L as computed by DSYTRF.
                 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)
                 LDA is INTEGER
                 The leading dimension of the array A.
                 LDA >= max(1,N).


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


       WORK (output)
                 WORK is DOUBLE PRECISION array, dimension (N+NNB+1,NNB+3)


       NB (input)
                 NB is INTEGER
                 Block size


       INFO (output)
                 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.



                                  7 Nov 2015                      dsytri2x(3P)