full name: tenpy.tools.math.rq_li
- tenpy.tools.math.rq_li(A, cutoff=1e-15)[source]¶
RQ decomposition with cutoff to discard nearly linear dependent columns in Q.
qr_li()on tranpose of A. Note that R is nonzero in the lowest left corner; R has entries below the diagonal for non-square R.
numpy.ndarray) – Matrix to be decomposed as
A = Q.R
R, Q – Decomposition of A into isometry Q Q^d = 1 and upper right R with diagonal entries larger than cutoff. If
M, N = A.shape, then
R.shape = M, Kand
Q.shape = K, Nwith
K <= min(M, N).
- Return type