##### trsna

###### Prototype

There is one prototype of `trsna` available, please see below.

    trsna( const char job, const char howmny, const VectorSELECT& select,
            const MatrixT& t, const MatrixVL& vl, const MatrixVR& vr, VectorS& s,
            VectorSEP& sep, const int_t mm, int_t& m,
            const int_t ldwork );

###### Description

`trsna` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines STRSNA, DTRSNA, CTRSNA, and ZTRSNA. `trsna` estimates reciprocal condition numbers for specified eigenvalues and/or right eigenvectors of a complex upper triangular matrix T (or of any matrix QT*Q*H with Q unitary).

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

Table 1.234. Dispatching of trsna

Value type of VectorSELECT | LAPACK routine
--- | ---
`float` | STRSNA
`double` | DTRSNA
`complex<float>` | CTRSNA
`complex<double>` | ZTRSNA

###### Definition

Defined in header `boost/numeric/bindings/lapack/computational/trsna.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/trsna.hpp>
    using namespace boost::numeric::bindings;

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files strsna.f, dtrsna.f, ctrsna.f, and ztrsna.f at Netlib.