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- 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

*\nu*,*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

*\nu*,*J_\nu(x)*, evaluated at a series of*x*values. The array`v`of length`size`contains the*x*values. They are assumed to be strictly ordered and positive. The array is over-written with the values of*J_\nu(x_i)*.