zpptri - compute the inverse of a complex Hermitian positive definite matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by CPPTRF
SUBROUTINE ZPPTRI( UPLO, N, A, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(*) INTEGER N, INFO
SUBROUTINE ZPPTRI_64( UPLO, N, A, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(*) INTEGER*8 N, INFO
SUBROUTINE PPTRI( UPLO, N, A, [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:) :: A INTEGER :: N, INFO
SUBROUTINE PPTRI_64( UPLO, N, A, [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:) :: A INTEGER(8) :: N, INFO
#include <sunperf.h>
void zpptri(char uplo, int n, doublecomplex *a, int *info);
void zpptri_64(char uplo, long n, doublecomplex *a, long *info);
zpptri computes the inverse of a complex Hermitian positive definite matrix A using the Cholesky factorization A = U**H*U or A = L*L**H computed by CPPTRF.
= 'U': Upper triangular factor is stored in A;
= 'L': Lower triangular factor is stored in A.
U(i,j)
for 1 < =i < =j;
if UPLO = 'L', A(i + (j-1)*(2n-j)/2) = L(i,j)
for j < =i < =n.
On exit, the upper or lower triangle of the (Hermitian) inverse of A, overwriting the input factor U or L.
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
> 0: if INFO = i, the (i,i) element of the factor U or L is zero, and the inverse could not be computed.