Function gsl_sys::gsl_stats_ulong_pvariance

pub unsafe extern "C" fn gsl_stats_ulong_pvariance(
    data1: *const c_ulong, 
    stride1: usize, 
    n1: usize, 
    data2: *const c_ulong, 
    stride2: usize, 
    n2: usize
) -> f64