Prototype

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

sptrd( MatrixAP& ap, VectorD& d, VectorE& e, VectorTAU& tau );

Description

sptrd (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SSPTRD and DSPTRD. sptrd reduces a real symmetric matrix A stored in packed form to symmetric tridiagonal form T by an orthogonal similarity transformation: Q**T * A * Q = T.

The selection of the LAPACK routine is done during compile-time, and is determined by the type of values contained in type MatrixAP. The type of values is obtained through the value_type meta-function typename value_type<MatrixAP>::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/sptrd.hpp.

Parameters or Requirements on Types

Complexity

Example

#include <boost/numeric/bindings/lapack/computational/sptrd.hpp>
using namespace boost::numeric::bindings;

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

this will output

[5] 0 1 2 3 4 5

Notes

See Also