fn var(&self) -> Vec<f64> {
        let mut container: Vec<f64> = Vec::new();
        let c = self.col;

        for i in 0..c {
            container.push(self.col(i).var());
        }
        container
    }
Column variance

# Examples
```
#[macro_use]
extern crate peroxide;
use peroxide::fuga::*;

fn main() {
let m = matrix(c!(1,2,3,3,2,1), 3, 2, Col);
assert!(nearly_eq(m.var()[0], 1));
}
```
src/statistics/stat.rs