(S|D|C|Z)GETF2¶

Single, double, single complex, and double complex GETF2.

Description¶

Computes the LU decomposition of a matrix using partial pivoting and an unblocked algorithm.

The matrix A is factored as:

$A = P \mult L \mult U$

where P is a permutation matrix, L is unit lower triangular and U is upper triangular. On exit, L and U overwrite A (the unit diagonal is not stored), the locations of pivots are stored in IPIV, and the solution matrix X overwrites B.

LAPACK Interface¶

void sgetf2(const qml_long *M, const qml_long *N, float *A, const qml_long *LDA,
    qml_long *IPIV, qml_long *INFO);

void dgetf2(const qml_long *M, const qml_long *N, double *A, const qml_long *LDA,
    qml_long *IPIV, qml_long *INFO);

void cgetf2(const qml_long *M, const qml_long *N, qml_single_complex *A,
    const qml_long *LDA, qml_long *IPIV, qml_long *INFO);

void zgetf2(const qml_long *M, const qml_long *N, qml_double_complex *A,
    const qml_long *LDA, qml_long *IPIV, qml_long *INFO);

Arguments¶

M	Number of rows of A
N	Number of columns of A
A	Matrix of size M x N
LDA	Leading dimension of A
IPIV	Pivot indices indicating rows to interchange
INFO	0 on success, <0 for illegal arguments, >0 for singular decomposition