double gsl_sf_exprel_n(const int n, const double x)
{
EVAL_RESULT(gsl_sf_exprel_n_e(n, x, &result));
}
/**
* C++ version of gsl_sf_exprel_n_e().
* Similarly for the N-th generalization of
* exprel_2. The so-called N-relative exponential
*
* exprel_N(x) = N!/x^N (exp(x) - Sum[x^k/k!, {k,0,N-1}])
* = 1 + x/(N+1) + x^2/((N+1)(N+2)) + ...
* = 1F1(1,1+N,x)
* @param n A real number
* @param x A real number
* @param result The result as a @c gsl::sf::result object
* @return Error code on failure
*/
inline int exprel_n_e( int const n, double const x, result& result ){
return gsl_sf_exprel_n_e( n, x, &result ); }
