prec_dot

Prototype

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

prec_dot( const VectorX& x, const VectorY& y );

Description

prec_dot (short for TODO) provides a C++ interface to BLAS routines DSDOT. precision accumulation and result.

Returns D.P. dot product accumulated in D.P., for S.P. SX and SY prec_dot = sum for I = 0 to N-1 of SX(LX+I*INCX) * SY(LY+I*INCY), where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is defined in a similar way using INCY.

The selection of the BLAS routine is done during compile-time, and is determined by the type of values contained in type VectorX. The type of values is obtained through the value_type meta-function typename value_type<VectorX>::type. Table X below illustrates to which specific routine this dispatching will take place.

Table 1.18. Dispatching of prec_dot.

Value type of VectorX	BLAS routine	CBLAS routine	CUBLAS routine
`double`	DSDOT	cblas_dsdot	Unavailable

The original routines DSDOT have five arguments, whereas prec_dot requires two arguments.

Table 1.19. Deduction of arguments of prec_dot.

Definition

Defined in header boost/numeric/bindings/blas/level1/prec_dot.hpp.

Parameters or Requirements on Types

Parameters

MatrixA

The definition of term 1

MatrixB

The definition of term 2

MatrixC

The definition of term 3.

Definitions may contain paragraphs.

Complexity

Example

#include <boost/numeric/bindings/blas/level1/prec_dot.hpp>
using namespace boost::numeric::bindings;

blas::prec_dot( x, y, z );

this will output

[5] 0 1 2 3 4 5