Function average 

pub fn average<T: AsRef<[f64]>>(values: T) -> f64

Calculate statistical average for values.

Return NaN if the values are empty.

Filter NaN values in the stream.

Example

#[macro_use]
use numeric_statistics::assert_eq_f64;
use numeric_statistics::f64::average::*;
let values = &[1.0, 2.0, 4.0];
let average = average(values);
assert_eq_f64!(average, 2.3333333333333333 as f64);