__Function:__double**gsl_sf_bessel_Jnu***(double*`nu`, double`x`)__Function:__int**gsl_sf_bessel_Jnu_e***(double*`nu`, double`x`, gsl_sf_result *`result`)- These routines compute the regular cylindrical Bessel function of fractional order @math{nu}, @math{J_\nu(x)}.

__Function:__int**gsl_sf_bessel_sequence_Jnu_e***(double*`nu`, gsl_mode_t`mode`, size_t`size`, double`v`[])-
This function computes the regular cylindrical Bessel function of
fractional order @math{\nu}, @math{J_\nu(x)}, evaluated at a series of
@math{x} values. The array
`v`of length`size`contains the @math{x} values. They are assumed to be strictly ordered and positive. The array is over-written with the values of @math{J_\nu(x_i)}.

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