Prototype

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

ptcon( const VectorD& d, const VectorE& e, const Scalar >, Scalar > );

Description

ptcon (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SPTCON, DPTCON, CPTCON, and ZPTCON. ptcon computes the reciprocal of the condition number (in the 1-norm) of a complex Hermitian positive definite tridiagonal matrix using the factorization A = LD*LH or A = U*H*D*U computed by ZPTTRF.

Norm(inv(A)) is computed by a direct method, and the reciprocal of the condition number is computed as RCOND = 1 / (ANORM * norm(inv(A))).

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/ptcon.hpp.

Parameters or Requirements on Types

Complexity

Example

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

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

this will output

[5] 0 1 2 3 4 5

Notes

See Also