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[section steqr]

[heading Prototype]
There is one prototype of `steqr` available, please see below.
``
steqr( const char compz, VectorD& d, VectorE& e, MatrixZ& z );
``


[heading Description]

`steqr` (short for $FRIENDLY_NAME) provides a C++
interface to LAPACK routines SSTEQR, DSTEQR, CSTEQR, and ZSTEQR. 
`steqr` computes all eigenvalues and, optionally, eigenvectors of a
symmetric tridiagonal matrix using the implicit QL or QR 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.

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 Dispatching of steqr
[  [ Value type of VectorD ] [LAPACK routine] ]
[  [`float`][SSTEQR] ]
[  [`double`][DSTEQR] ]
[  [`complex<float>`][CSTEQR] ]
[  [`complex<double>`][ZSTEQR] ]

]


[heading Definition]
Defined in header [headerref boost/numeric/bindings/lapack/computational/steqr.hpp].


[heading Parameters or Requirements on Types]

[variablelist Parameters
    [[MatrixA] [The definition of term 1]]
    [[MatrixB] [The definition of term 2]]
    [[MatrixC] [
    The definition of term 3.

    Definitions may contain paragraphs.
    ]]
]


[heading Complexity]


[heading Example]
``
#include <boost/numeric/bindings/lapack/computational/steqr.hpp>
using namespace boost::numeric::bindings;

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

``

this will output

``
[5] 0 1 2 3 4 5
``



[heading Notes]


[heading See Also]

* Originating Fortran source files [@http://www.netlib.org/lapack/single/ssteqr.f ssteqr.f], [@http://www.netlib.org/lapack/double/dsteqr.f dsteqr.f], [@http://www.netlib.org/lapack/complex/csteqr.f csteqr.f], and [@http://www.netlib.org/lapack/complex16/zsteqr.f zsteqr.f] at Netlib.

[endsect]
