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Octave-Forge - Extra packages for GNU Octave |
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Octave-Forge - Extra packages for GNU Octave |
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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(:,1:j-1), U, A(:,j:n)],
where u is a column vector to be inserted into A
(if orient is "col"),
or the QR factorization of [A(1:j-1,:);X;A(:,j:n)],
where x is a row orient is "row").
The default value of orient is "col".
If orient is "col", j may be an index vector
resulting in the QR factorization of a matrix B such that
A(:,j) = [] gives B. Notice that the latter case is done as
a sequence of k deletions; thus, for k large enough, it will be both faster
and more accurate to recompute the factorization from scratch.
If orient is "col", the QR factorization supplied may
be either full (Q is square) or economized (R is square).
If orient is "row", full factorization is needed.
See also: qr, qrupdate, qrinsert, qrshift.
Package: octave