Function linear_fit 

pub fn linear_fit<N>(xs: &[N], ys: &[N]) -> Result<Polynomial<N>, String>
where
    N: ComplexField + FromPrimitive + Copy,
    <N as ComplexField>::RealField: FromPrimitive + Copy,

Linear least-squares regression

Errors

Returns an error if the linear fit fails. (xs.len() != ys.len())

Panics

Panics if a usize cannot be transformed into the generic type.