##### stedc

###### Prototype

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

    stedc( const char compz, VectorD& d, VectorE& e, MatrixZ& z );

###### Description

`stedc` (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SSTEDC, DSTEDC, CSTEDC, and ZSTEDC. `stedc` computes all eigenvalues and, optionally, eigenvectors of a symmetric tridiagonal matrix using the divide and conquer method. The eigenvectors of a full or band complex Hermitian matrix can also be found if ZHETRD or ZHPTRD or ZHBTRD has been used to reduce this matrix to tridiagonal form.

This code makes very mild assumptions about floating point arithmetic. It will work on machines with a guard digit in add/subtract, or on those binary machines without guard digits which subtract like the Cray X-MP, Cray Y-MP, Cray C-90, or Cray-2. It could conceivably fail on hexadecimal or decimal machines without guard digits, but we know of none. See DLAED3 for details.

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

Table 1.319. Dispatching of stedc

Value type of VectorD | LAPACK routine
--- | ---
`float` | SSTEDC
`double` | DSTEDC
`complex<float>` | CSTEDC
`complex<double>` | ZSTEDC

###### Definition

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

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

this will output

    [5] 0 1 2 3 4 5

###### Notes

###### See Also

- Originating Fortran source files sstedc.f, dstedc.f, cstedc.f, and zstedc.f at Netlib.