Function gsl_sys::gsl_filter_gaussian

pub unsafe extern "C" fn gsl_filter_gaussian(
    endtype: gsl_filter_end_t, 
    alpha: f64, 
    order: usize, 
    x: *const gsl_vector, 
    y: *mut gsl_vector, 
    w: *mut gsl_filter_gaussian_workspace
) -> c_int

This is supported on crate feature v2_5 only.