There is one prototype of nrm2
            available, please see below. 
nrm2( const VectorX& x );
            nrm2 (short for TODO)
            provides a C++ interface to BLAS routines SNRM2, DNRM2, SCNRM2, and DZNRM2.
          
            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 1.16. Dispatching of nrm2.
| Value type of VectorX | BLAS routine | CBLAS routine | CUBLAS routine | 
|---|---|---|---|
| 
                       | SNRM2 | cblas_snrm2 | cublasSnrm2 | 
| 
                       | DNRM2 | cblas_dnrm2 | cublasDnrm2 | 
| 
                       | SCNRM2 | cblas_scnrm2 | cublasScnrm2 | 
| 
                       | DZNRM2 | cblas_dznrm2 | Unavailable | 
            The original routines SNRM2, DNRM2, SCNRM2, and DZNRM2 have three arguments,
            whereas nrm2 requires
            one arguments.
          
            Defined in header boost/numeric/bindings/blas/level1/nrm2.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/level1/nrm2.hpp> using namespace boost::numeric::bindings; blas::nrm2( x, y, z );
this will output
[5] 0 1 2 3 4 5