Prototype

There is one prototype of labrd available, please see below.

labrd( MatrixA& a, VectorD& d, VectorE& e, VectorTAUQ& tauq,
        VectorTAUP& taup, MatrixX& x, MatrixY& y );

Description

labrd (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SLABRD, DLABRD, CLABRD, and ZLABRD. labrd reduces the first NB rows and columns of a complex general m by n matrix A to upper or lower real bidiagonal form by a unitary transformation Q' * A * P, and returns the matrices X and Y which are needed to apply the transformation to the unreduced part of A.

If m >= n, A is reduced to upper bidiagonal form; if m < n, to lower bidiagonal form.

This is an auxiliary routine called by ZGEBRD

The selection of the LAPACK routine is done during compile-time, and is determined by the type of values contained in type MatrixA. The type of values is obtained through the value_type meta-function typename value_type<MatrixA>::type. The dispatching table below illustrates to which specific routine the code path will be generated.

Definition

Defined in header boost/numeric/bindings/lapack/auxiliary/labrd.hpp.

Parameters or Requirements on Types

Complexity

Example

#include <boost/numeric/bindings/lapack/auxiliary/labrd.hpp>
using namespace boost::numeric::bindings;

lapack::labrd( x, y, z );

this will output

[5] 0 1 2 3 4 5

Notes

See Also