[過去ﾛｸﾞ] Rust part24 (1002ﾚｽ)
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342(2): 2024/06/24(月)23:33 ID:FIb4AZ4T(1/2) AAS
>>328-329
なんかダサい
外部ﾘﾝｸ:paiza.io
pub fn f(x: i32) -> i32 {
(
-2413f64*(x.pow(6) as f64)/120960f64
+739f64*(x.pow(5) as f64)/1260f64
-157991f64*(x.pow(4) as f64)/24192f64
+69551f64*(x.pow(3) as f64)/2016f64
-2691673f64*(x.pow(2) as f64)/30240f64
+88679f64*(x as f64)/840f64
-905f64/21f64
+0.5)
as i32
}
pub fn g(y: i32) -> i32 {
(
13f64*(y.pow(6) as f64)/120960f64
-(y.pow(5) as f64)/315f64
+1415f64*(y.pow(4) as f64)/24192f64
-1511f64*(y.pow(3) as f64)/2016f64
+144793f64*(y.pow(2) as f64)/30240f64
-3053f64*(y as f64)/280f64
+185f64/21f64
+0.5)
as i32
}
pub fn main() {
let a = vec![(1, 2), (2, 1), (3, 3), (4, 10), (6, 4), (8, 8), (10, 6)];
for (x, _y) in &a { println!("{}, {}", x, f(*x)); }
for (_x, y) in &a { println!("{}, {}", y, g(*y)); }
省1

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343(1): 2024/06/24(月)23:39 ID:FIb4AZ4T(2/2) AAS
係数はこっちで求めたでござる
外部ﾘﾝｸ:paiza.io
import sys, os
from functools import reduce
import sympy as sy

def lc(a):
x, y = sy.symbols('x y')
p = 0
for i, (c, d) in enumerate(a):
g = reduce(lambda s, t: (t[0], (s[1][0] * (1 if t[0] == i else (x - t[1][0])), 0)), enumerate(a), (-1, (1, 0)))
f = g[1][0]
p += d * f / f.subs(x, c)
print(p)
print(p.expand())
for c, d in a:
print(p.subs(x, c), p.subs(x, c) == d)

if __name__ == '__main__':
lc([(1, 2), (2, 1), (3, 3), (4, 10), (6, 4), (8, 8), (10, 6)])
lc([(2, 1), (1, 2), (3, 3), (10, 4), (4, 6), (8, 8), (6, 10)])

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