chptri (3p)

Name

chptri - compute the inverse of a complex Hermitian indefinite matrix A in packed storage using the factorization A = U*D*U**H or A = L*D*L**H computed by CHPTRF

Synopsis

SUBROUTINE CHPTRI(UPLO, N, A, IPIVOT, WORK, INFO)

CHARACTER*1 UPLO
COMPLEX A(*), WORK(*)
INTEGER N, INFO
INTEGER IPIVOT(*)

SUBROUTINE CHPTRI_64(UPLO, N, A, IPIVOT, WORK, INFO)

CHARACTER*1 UPLO
COMPLEX A(*), WORK(*)
INTEGER*8 N, INFO
INTEGER*8 IPIVOT(*)




F95 INTERFACE
SUBROUTINE HPTRI(UPLO, N, A, IPIVOT, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
COMPLEX, DIMENSION(:) :: A, WORK
INTEGER :: N, INFO
INTEGER, DIMENSION(:) :: IPIVOT

SUBROUTINE HPTRI_64(UPLO, N, A, IPIVOT, WORK, INFO)

CHARACTER(LEN=1) :: UPLO
COMPLEX, DIMENSION(:) :: A, WORK
INTEGER(8) :: N, INFO
INTEGER(8), DIMENSION(:) :: IPIVOT




C INTERFACE
#include <sunperf.h>

void chptri(char uplo, int n, complex *a, int *ipivot, int *info);

void  chptri_64(char  uplo,  long  n,  complex  *a,  long *ipivot, long
*info);

Description

Oracle Solaris Studio Performance Library                           chptri(3P)



NAME
       chptri - compute the inverse of a complex Hermitian indefinite matrix A
       in packed storage using the factorization A = U*D*U**H or A =  L*D*L**H
       computed by CHPTRF


SYNOPSIS
       SUBROUTINE CHPTRI(UPLO, N, A, IPIVOT, WORK, INFO)

       CHARACTER*1 UPLO
       COMPLEX A(*), WORK(*)
       INTEGER N, INFO
       INTEGER IPIVOT(*)

       SUBROUTINE CHPTRI_64(UPLO, N, A, IPIVOT, WORK, INFO)

       CHARACTER*1 UPLO
       COMPLEX A(*), WORK(*)
       INTEGER*8 N, INFO
       INTEGER*8 IPIVOT(*)




   F95 INTERFACE
       SUBROUTINE HPTRI(UPLO, N, A, IPIVOT, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       COMPLEX, DIMENSION(:) :: A, WORK
       INTEGER :: N, INFO
       INTEGER, DIMENSION(:) :: IPIVOT

       SUBROUTINE HPTRI_64(UPLO, N, A, IPIVOT, WORK, INFO)

       CHARACTER(LEN=1) :: UPLO
       COMPLEX, DIMENSION(:) :: A, WORK
       INTEGER(8) :: N, INFO
       INTEGER(8), DIMENSION(:) :: IPIVOT




   C INTERFACE
       #include <sunperf.h>

       void chptri(char uplo, int n, complex *a, int *ipivot, int *info);

       void  chptri_64(char  uplo,  long  n,  complex  *a,  long *ipivot, long
                 *info);



PURPOSE
       chptri computes the inverse of a complex Hermitian indefinite matrix  A
       in  packed storage using the factorization A = U*D*U**H or A = L*D*L**H
       computed by CHPTRF.


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**H;
                 = 'L':  Lower triangular, form is A = L*D*L**H.


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


       A (input/output) COMPLEX array, dimension (N*(N+1)/2)
                 On entry, the block diagonal matrix  D  and  the  multipliers
                 used  to  obtain  the  factor  U  or L as computed by CHPTRF,
                 stored as a packed triangular matrix.

                 On exit, if INFO = 0, the (Hermitian) inverse of the original
                 matrix, stored as a packed triangular matrix. The j-th column
                 of inv(A) is stored in the array A as follows: if UPLO = 'U',
                 A(i  +  (j-1)*j/2)  = inv(A)(i,j) for 1<=i<=j; if UPLO = 'L',
                 A(i + (j-1)*(2n-j)/2) = inv(A)(i,j) for j<=i<=n.


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


       WORK (workspace)
                 COMPLEX array, 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                        chptri(3P)