##### syevx

###### Prototype

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

    syevx( 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

`syevx` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SSYEVX and DSYEVX. `syevx` computes selected eigenvalues and, optionally, eigenvectors of a real symmetric 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 1.180. Dispatching of syevx

Value type of MatrixA | LAPACK routine
--- | ---
`float` | SSYEVX
`double` | DSYEVX

###### Definition

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

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

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