1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
use num::{Float, FromPrimitive};
pub fn goldsteinprice<T: Float + FromPrimitive>(param: &[T]) -> T {
assert!(param.len() == 2);
let (x1, x2) = (param[0], param[1]);
(T::from_f64(1.0).unwrap()
+ (x1 + x2 + T::from_f64(1.0).unwrap()).powi(2)
* (T::from_f64(19.0).unwrap() - T::from_f64(14.0).unwrap() * (x1 + x2)
+ T::from_f64(3.0).unwrap() * (x1.powi(2) + x2.powi(2))
+ T::from_f64(6.0).unwrap() * x1 * x2))
* (T::from_f64(30.0).unwrap()
+ (T::from_f64(2.0).unwrap() * x1 - T::from_f64(3.0).unwrap() * x2).powi(2)
* (T::from_f64(18.0).unwrap() - T::from_f64(32.0).unwrap() * x1
+ T::from_f64(12.0).unwrap() * x1.powi(2)
+ T::from_f64(48.0).unwrap() * x2
- T::from_f64(36.0).unwrap() * x1 * x2
+ T::from_f64(27.0).unwrap() * x2.powi(2)))
}
mod tests {
#[test]
fn test_goldsteinprice_optimum() {
assert!((::goldsteinprice(&[0.0_f32, -1.0_f32]) - 3_f32).abs() < ::std::f32::EPSILON);
assert!((::goldsteinprice(&[0.0_f64, -1.0_f64]) - 3_f64).abs() < ::std::f64::EPSILON);
}
#[test]
#[should_panic]
fn test_goldsteinprice_param_length() {
::goldsteinprice(&[0.0_f32, -1.0_f32, 0.1_f32]);
}
}