Prototype

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

trrfs( const MatrixA& a, const MatrixB& b, const MatrixX& x,
        VectorFERR& ferr, VectorBERR& berr );

Description

trrfs (short for $FRIENDLY_NAME) provides a C++ interface to LAPACK routines STRRFS, DTRRFS, CTRRFS, and ZTRRFS. trrfs provides error bounds and backward error estimates for the solution to a system of linear equations with a triangular coefficient matrix.

The solution matrix X must be computed by ZTRTRS or some other means before entering this routine. trrfs does not do iterative refinement because doing so cannot improve the backward error.

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

Parameters or Requirements on Types

Complexity

Example

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

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

this will output

[5] 0 1 2 3 4 5

Notes

See Also