There is one prototype of symv
            available, please see below. 
symv( const Scalar >, const MatrixA& a, const VectorX& x, const Scalar >, VectorY& y );
            symv (short for symmetric
            matrix-vector operation) provides a C++ interface to BLAS routines SSYMV
            and DSYMV. symv performs
            the matrix-vector operation
          
y := alpha*A*x + beta*y,
where alpha and beta are scalars, x and y are n element vectors and A is an n by n symmetric matrix.
            The selection of the BLAS 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. Table X below illustrates to
            which specific routine this dispatching will take place.
          
Table 1.64. Dispatching of symv.
| Value type of MatrixA | BLAS routine | CBLAS routine | CUBLAS routine | 
|---|---|---|---|
| 
                       | SSYMV | cblas_ssymv | cublasSsymv | 
| 
                       | DSYMV | cblas_dsymv | Unavailable | 
            The original routines SSYMV and DSYMV have ten arguments, whereas symv requires five arguments.
          
            Defined in header boost/numeric/bindings/blas/level2/symv.hpp.
          
Parameters
The definition of term 1
The definition of term 2
The definition of term 3.
Definitions may contain paragraphs.
#include <boost/numeric/bindings/blas/level2/symv.hpp> using namespace boost::numeric::bindings; blas::symv( x, y, z );
this will output
[5] 0 1 2 3 4 5