Function gsl_sys::gsl_stats_float_covariance_m

pub unsafe extern "C" fn gsl_stats_float_covariance_m(
    data1: *const f32, 
    stride1: usize, 
    data2: *const f32, 
    stride2: usize, 
    n: usize, 
    mean1: f64, 
    mean2: f64
) -> f64