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C++ API

: [Q1, R1] = qrshift (Q, R, i, j)

Given a QR factorization of a real or complex matrix A = Q*R, Q unitary and R upper trapezoidal, return the QR factorization of A(:,p), where p is the permutation
p = [1:i-1, shift(i:j, 1), j+1:n] if i < j
or
p = [1:j-1, shift(j:i,-1), i+1:n] if j < i.

See also: qr, qrupdate, qrinsert, qrdelete.

Package: octave