scipy.linalg.lapack.zgeqrf

scipy.linalg.lapack.zgeqrf(a, lwork=``3 * n``, overwrite_a=0) = <flapack function zgeqrf>

Compute a QR factorization (LAPACK zgeqrf).

Parameters:

andarray

Matrix of shape (m, n).

lworkint, optional

Size of the workspace. Default is 3 * n. Use geqrf_lwork for the optimal value.

overwrite_aint, optional

If nonzero, a may be overwritten in place. Default is 0.

Returns:

qrndarray

R in the upper triangle; below it, the reflectors that define Q.

taundarray

Scalar factors of the elementary reflectors that define Q.

workndarray

Workspace actually used; work[0] is the optimal lwork.

infoint

0 on success; if negative, the -info-th argument had an illegal value.