Method on @infsup: [Q, R] = qr (A) ¶

Method on @infsup: [Q, R, P] = qr (A) ¶

Compute the QR decomposition of A.

A will be a subset of Q * R with orthogonal matrix Q and triangular matrix R.

The columns of Q are orthogonal unit vectors, that is, Q' * Q equals the identity. R is an upper triangular matrix with positive diagonal elements.

The result is returned in a permuted form, according to the optional return value P.

Accuracy: The result is a valid enclosure.

See also: @@infsup/lu, @@infsup/chol.

Package: interval