Function dot_multiplier 

pub fn dot_multiplier(dots: u32) -> FloatType

What dots dots multiply a note’s length by: music21’s dotMultiplier. It is always exact, since its denominator is a power of two.

use music21::common::numbertools::dot_multiplier;

assert_eq!(dot_multiplier(0), 1.0);
assert_eq!(dot_multiplier(2), 1.75);