Prototype

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

unghr( const int_t n, const int_t ilo,
        const int_t ihi, MatrixA& a, const VectorTAU& tau );

Description

unghr (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SORGHR, DORGHR, CUNGHR, and ZUNGHR. unghr generates a complex unitary matrix Q which is defined as the product of IHI-ILO elementary reflectors of order N, as returned by ZGEHRD:

Q = H(ilo) H(ilo+1) . . . H(ihi-1).

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/computational/unghr.hpp.

Parameters or Requirements on Types

Complexity

Example

#include <boost/numeric/bindings/lapack/computational/unghr.hpp>
using namespace boost::numeric::bindings;

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

this will output

[5] 0 1 2 3 4 5

Notes

See Also