(S|D|C|Z)POTF2¶

Single, double, single complex, and double complex POTF2.

Description¶

Computes the Cholesky factorization of a positive definite matrix using an unblocked algorithm.

If UPLO is ‘U’ then A is factored using an upper triangular matrix U:

$A = \herm{U} \mult U$

If UPLO is ‘L’ then A is factored using a lower triangular matrix L:

$A = L \mult \herm{L}$

The upper or lower triangular part of A is overwritten on exit with U or L. The opposite side is not modified.

LAPACK Interface¶

void spotf2(const char *UPLO, const qml_long *N, float *A, const qml_long *LDA,
    qml_long *INFO);

void dpotf2(const char *UPLO, const qml_long *N, double *A, const qml_long *LDA,
    qml_long *INFO);

void cpotf2(const char *UPLO, const qml_long *N, qml_single_complex *A,
    const qml_long *LDA, qml_long *INFO);

void zpotf2(const char *UPLO, const qml_long *N, qml_double_complex *A,
    const qml_long *LDA, qml_long *INFO);

Arguments¶

UPLO	Specify whether to factor using ‘U’ upper triangular or ‘L’ lower triangular
N	Order of the matrix A
A	Matrix of size N x N, overwritten with factorization on exit
LDA	Leading dimension of A
INFO	0 on success, <0 on illegal arguments, >0 if not positive definite