SUBROUTINE DPOTF2( UPLO, N, A, LDA, INFO) CHARACTER * 1 UPLO INTEGER N, LDA, INFO DOUBLE PRECISION A(LDA,*) SUBROUTINE DPOTF2_64( UPLO, N, A, LDA, INFO) CHARACTER * 1 UPLO INTEGER*8 N, LDA, INFO DOUBLE PRECISION A(LDA,*)
SUBROUTINE POTF2( UPLO, [N], A, [LDA], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A SUBROUTINE POTF2_64( UPLO, [N], A, [LDA], [INFO]) CHARACTER(LEN=1) :: UPLO INTEGER(8) :: N, LDA, INFO REAL(8), DIMENSION(:,:) :: A
void dpotf2(char uplo, int n, double *a, int lda, int *info);
void dpotf2_64(char uplo, long n, double *a, long lda, long *info);
The factorization has the form
A = U' * U , if UPLO = 'U', or A = L * L', if UPLO = 'L',
where U is an upper triangular matrix and L is lower triangular.
This is the unblocked version of the algorithm, calling Level 2 BLAS.
On exit, if INFO = 0, the factor U or L from the Cholesky factorization A = U'*U or A = L*L'.