Description of gelqf

gelqf		Programmers Guide
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Category:mtl2lapack

Component type:function

Prototype

template <class LapackMatA, class VectorT> int gelqf(LapackMatA& a, VectorT& tau) ;

Description

Compute an LQ factorization of a M-by-N matrix A.

a (IN/OUT - matrix(M,N)) On entry, the M-by-N matrix A. On exit, the elements on and below the diagonal of the array contain the m-by-min(m,n) lower trapezoidal matrix L (L is lower triangular if m <= n); the elements above the diagonal, with the array TAU, represent the unitary matrix Q as a product of elementary reflectors.
tau (OUT - vector(min(M,N)) The scalar factors of the elementary reflectors.

Definition

mtl2lapack.h

Preconditions

Complexity

Example

Notes

See also