zpotrf - compute the Cholesky factorization of a complex Hermitian positive definite matrix A
SUBROUTINE ZPOTRF( UPLO, N, A, LDA, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(LDA,*) INTEGER N, LDA, INFO
SUBROUTINE ZPOTRF_64( UPLO, N, A, LDA, INFO) CHARACTER * 1 UPLO DOUBLE COMPLEX A(LDA,*) INTEGER*8 N, LDA, INFO
SUBROUTINE POTRF( UPLO, [N], A, [LDA], [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:,:) :: A INTEGER :: N, LDA, INFO
SUBROUTINE POTRF_64( UPLO, [N], A, [LDA], [INFO]) CHARACTER(LEN=1) :: UPLO COMPLEX(8), DIMENSION(:,:) :: A INTEGER(8) :: N, LDA, INFO
#include <sunperf.h>
void zpotrf(char uplo, int n, doublecomplex *a, int lda, int *info);
void zpotrf_64(char uplo, long n, doublecomplex *a, long lda, long *info);
zpotrf computes the Cholesky factorization of a complex Hermitian positive definite matrix A.
The factorization has the form
A = U**H * U, if UPLO = 'U', or
A = L * L**H, if UPLO = 'L',
where U is an upper triangular matrix and L is lower triangular.
This is the block version of the algorithm, calling Level 3 BLAS.
= 'U': Upper triangle of A is stored;
= 'L': Lower triangle of A is stored.
On exit, if INFO = 0, the factor U or L from the Cholesky factorization A = U**H*U or A = L*L**H.
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value
> 0: if INFO = i, the leading minor of order i is not positive definite, and the factorization could not be completed.