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ungrq
Prototype

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

ungrq( MatrixA& a, const VectorTAU& tau );

Description

ungrq (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SORGRQ, DORGRQ, CUNGRQ, and ZUNGRQ. ungrq generates an M-by-N complex matrix Q with orthonormal rows, which is defined as the last M rows of a product of K elementary reflectors of order N

Q = H(1)' H(2)' . . . H(k)'

as returned by ZGERQF.

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.

Table 1.210. Dispatching of ungrq

Value type of MatrixA

LAPACK routine

float

SORGRQ

double

DORGRQ

complex<float>

CUNGRQ

complex<double>

ZUNGRQ


Definition

Defined in header boost/numeric/bindings/lapack/computational/ungrq.hpp.

Parameters or Requirements on Types

Parameters

MatrixA

The definition of term 1

MatrixB

The definition of term 2

MatrixC

The definition of term 3.

Definitions may contain paragraphs.

Complexity
Example

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

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

this will output

[5] 0 1 2 3 4 5

Notes
See Also

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