多体問題に対するいろんなアイディアを試す
License: MIT License
Hi, there! 👋
kd-tree は問題にあってないのかも
10進50桁近くで計算すれば高次のルンゲ・クッタ公式でうまく計算できるのでは？
ただし多くはあつかえない。100体が限度であろう。
重力多体問題特化コードにするのが良いと思う。
pub fn dormand_prince_vec(
self: &mut IntegralSettings,
func: Box<dyn Fn(&Vec<f64>) -> Vec<f64>>,
vec: &Vec<f64>,
) -> Vec<f64>の関数呼び出しもボトルネックなので直書きしたほうが良さそう。
https://ssd.jpl.nasa.gov/horizons/app.html#/ の利用
例：
Horizons> 399
Observe, Elements, Vectors [o,e,v,?] : v
Coordinate center [ <id>,coord,geo ] : 010
Confirm selected station [ y/n ] --> y
Reference plane [eclip, frame, body ] : eclip
Starting TDB [>= 9999BC-Mar-21 00:01] : 1991-12-31
Ending TDB [<= 9999-Dec-30 12:00] : 2000-01-01
Output interval [ex: 10m, 1h, 1d, ? ] : 1d
Accept default output [ cr=(y), n, ?] : n
Output reference frame [ ICRF, B1950] : ICRF
Corrections [ 1=NONE, 2=LT, 3=LT+S ] : 1
Output units [1=KM-S, 2=AU-D, 3=KM-D] : 2
Spreadsheet CSV format [ YES, NO ] : NO
Output delta-T (TDB-UT) [ YES, NO ] : YES
Select output table type [ 1-6, ? ] : 3
Label cartesian output [ YES, NO ] : YES
修正しましょう
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