nyx-space 0.0.21

A high-fidelity space mission toolkit, with orbit propagation, estimation and some systems engineering
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use super::RK;

/// `Fehlberg45` is a [Runge Kutta Fehlberg integrator](https://en.wikipedia.org/wiki/Runge%E2%80%93Kutta%E2%80%93Fehlberg_method).
pub struct Fehlberg45 {}

impl RK for Fehlberg45 {
    fn order() -> u8 {
        5
    }
    fn stages() -> usize {
        6
    }
    fn a_coeffs() -> &'static [f64] {
        &[
            1.0 / 4.0,
            3.0 / 32.0,
            9.0 / 32.0,
            1932.0 / 2197.0,
            -7200.0 / 2197.0,
            7296.0 / 2197.0,
            439.0 / 216.0,
            -8.0,
            3680.0 / 513.0,
            -845.0 / 4104.0,
            -8.0 / 27.0,
            2.0,
            -3544.0 / 2565.0,
            1859.0 / 4104.0,
            -11.0 / 40.0,
        ]
    }
    fn b_coeffs() -> &'static [f64] {
        &[
            16.0 / 135.0,
            0.0,
            6656.0 / 12825.0,
            28561.0 / 56430.0,
            -9.0 / 50.0,
            2.0 / 55.0,
            25.0 / 216.0,
            0.0,
            1408.0 / 2565.0,
            2197.0 / 4104.0,
            -1.0 / 5.0,
            0.0,
        ]
    }
}