Laguerre Functions
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The Laguerre polynomials are defined in terms of confluent hypergeometric functions as L^a_n(x) = (a+1)_n / n! 1F1(-n,a+1,x) .

 -- Function: int gsl_sf_laguerre_1_impl (double a, double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_2_impl (double a, double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_3_impl (double a, double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_1_e (double a, double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_2_e (double a, double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_3_e (double a, double x, gsl_sf_result * result)
     Evaluate generalized Laguerre polynomials using explicit representations. Exceptional Return Values: none

 -- Function: int gsl_sf_laguerre_n_impl (const int n, const double a, const double x, gsl_sf_result * result)
 -- Function: int gsl_sf_laguerre_n_e (int n, double a, double x, gsl_sf_result * result)
     Domain: a > -1.0, n >= 0 Evaluate generalized Laguerre polynomials. Exceptional Return Values: GSL_EDOM