Function flot::to_f64

pub fn to_f64<'a, I, T1, T2>(x: I) -> Box<Iterator<Item = (f64, f64)> + 'a> where
    I: IntoIterator<Item = &'a (T1, T2)> + 'a,
    T1: Into<f64> + Copy + 'a,
    T2: Into<f64> + Copy + 'a, 

take an iterator of references to tuples of two types and produce point tuples. The types can be anything that converts to f64