SUBROUTINE DPPTRF( UPLO, N, A, INFO) CHARACTER * 1 UPLO INTEGER N, INFO DOUBLE PRECISION A(*) SUBROUTINE DPPTRF_64( UPLO, N, A, INFO) CHARACTER * 1 UPLO INTEGER*8 N, INFO DOUBLE PRECISION A(*)
SUBROUTINE PPTRF( UPLO, N, A, [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, INFO REAL(8), DIMENSION(:) :: A SUBROUTINE PPTRF_64( UPLO, N, A, [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, INFO REAL(8), DIMENSION(:) :: A
void dpptrf(char uplo, int n, double *a, int *info);
void dpptrf_64(char uplo, long n, double *a, long *info);
The factorization has the form
A = U**T * U, if UPLO = 'U', or A = L * L**T, if UPLO = 'L',
where U is an upper triangular matrix and L is lower triangular.
On exit, if INFO = 0, the triangular factor U or L from the Cholesky factorization A = U**T*U or A = L*L**T, in the same storage format as A.