df-maths 0.1.1

This is an maths
Documentation 
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#[cfg(test)]
mod process {
    use df_maths::process;
    use df_maths::stats::stddev;

    #[test]
    fn cpk() {
        let list = vec![
            // 2.0, 2.0, 2.0, 2.0, 2.0, 2.0, 2.1, 2.2, 2.2,
            2.0
        ];
        let cpk = process::Cpk::new(2.5, 1.5, list);
        let (state, msg) = cpk.cpk_rating_criteria().clone();
        println!("工序能力指标 cpk: {} {} {}", cpk.cpk.clone(), state, msg);
        let (state, msg) = cpk.ca_rating_criteria().clone();
        println!("制程准确度 ca: {} {} {}", cpk.ca.clone(), state, msg);
        let (state, msg) = cpk.cp_rating_criteria().clone();
        println!("制程精密度 cp: {} {} {}", cpk.cp.clone(), state, msg);
    }

    #[test]
    fn spc() {
        let list = vec![
            107.25,
            107.08,
            107.14,
            107.05,
            107.1,
            107.14,
            107.16,
            107.22,
            107.07,
            107.1
        ];

        let data = stddev(list);
        println!(" stddev: {} ", data);
    }
}