Prototype

There is one prototype of steqr available, please see below.

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

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.

Definition

Defined in header boost/numeric/bindings/lapack/computational/steqr.hpp.

Parameters or Requirements on Types

Complexity

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

Notes

See Also