Prototype

There are two prototypes of ptrfs available, please see below.

ptrfs( const VectorD& d, const VectorE& e, const VectorDF& df,
        const VectorEF& ef, const MatrixB& b, MatrixX& x, VectorFERR& ferr,
        VectorBERR& berr );

ptrfs( const char uplo, const VectorD& d, const VectorE& e,
        const VectorDF& df, const VectorEF& ef, const MatrixB& b, MatrixX& x,
        VectorFERR& ferr, VectorBERR& berr );

Description

ptrfs (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines SPTRFS, DPTRFS, CPTRFS, and ZPTRFS. ptrfs improves the computed solution to a system of linear equations when the coefficient matrix is Hermitian positive definite and tridiagonal, and provides error bounds and backward error estimates for the solution.

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/ptrfs.hpp.

Parameters or Requirements on Types

Complexity

Example

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

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

this will output

[5] 0 1 2 3 4 5

Notes

See Also