There is one prototype of ungtr
            available, please see below. 
ungtr( const int_t n, MatrixA& a, const VectorTAU& tau );
            ungtr (short for $FRIENDLY_NAME)
            provides a C++ interface to LAPACK routines SORGTR, DORGTR, CUNGTR, and
            ZUNGTR. ungtr generates
            a complex unitary matrix Q which is defined as the product of n-1 elementary
            reflectors of order N, as returned by ZHETRD:
          
if UPLO = 'U', Q = H(n-1) . . . H(2) H(1),
if UPLO = 'L', Q = H(1) H(2) . . . H(n-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.
          
Table 1.326. Dispatching of ungtr
| Value type of MatrixA | LAPACK routine | 
|---|---|
| 
                       | SORGTR | 
| 
                       | DORGTR | 
| 
                       | CUNGTR | 
| 
                       | ZUNGTR | 
            Defined in header boost/numeric/bindings/lapack/computational/ungtr.hpp.
          
Parameters
The definition of term 1
The definition of term 2
The definition of term 3.
Definitions may contain paragraphs.
#include <boost/numeric/bindings/lapack/computational/ungtr.hpp> using namespace boost::numeric::bindings; lapack::ungtr( x, y, z );
this will output
[5] 0 1 2 3 4 5