quspin.tools.lanczos.lin_comb_Q_T

quspin.tools.lanczos.lin_comb_Q_T(coeff, Q_T, out=None)[source]

Computes a linear combination of the Lanczos basis vectors:

\[v_j = \sum_{i=1}^{m} c_i \left(Q^T\right)_{ij}\]

Parameters:

coeff(m,) array_like

list of coefficients to compute the linear combination of Lanczos basis vectors with.

Q_T(m,n) numpy.ndarray, generator

Lanczos basis vectors or a generator for the Lanczos basis.

out(n,) numpy.ndarray, optional

Array to store the result in.

Returns:

(n,) numpy.ndarray

Linear combination \(v\) of Lanczos basis vectors.

Examples

>>> v = lin_comb_Q(coeff,Q_T)