##### heevx

###### Prototype

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

    heevx( const char jobz, const char range, MatrixA& a, const Scalar >,
            const Scalar >, const int_t il,
            const int_t iu, const Scalar >, int_t& m,
            VectorW& w, MatrixZ& z, VectorIFAIL& ifail );

###### Description

`heevx` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SSYEVX, DSYEVX, CHEEVX, and ZHEEVX. `heevx` computes selected eigenvalues and, optionally, eigenvectors of a complex Hermitian matrix A. Eigenvalues and eigenvectors can be selected by specifying either a range of values or a range of indices for the desired eigenvalues.

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 1.163. Dispatching of heevx

Value type of MatrixA | LAPACK routine
--- | ---
`float` | SSYEVX
`double` | DSYEVX
`complex<float>` | CHEEVX
`complex<double>` | ZHEEVX

###### Definition

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

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files ssyevx.f, dsyevx.f, cheevx.f, and zheevx.f at Netlib.