Function get_proper_fraction 

pub fn get_proper_fraction(
    angle: f64,
    thresh: f64,
    max_trial_power: u32,
) -> Option<GenericFraction<u32>>

Determines the reduced fraction $k/n$ where $k$ and $n$ are both integers representing a proper rotation $C_n^k$ corresponding to a specified rotation angle.

Arguments

• angle - An angle of rotation.
• thresh - A threshold for checking if a floating point number is integral.
• max_trial_power - Maximum power $k$ to try.

Returns

An Option wrapping the required fraction.

Panics

Panics if the deduced order $n$ is negative.