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use num::{Float, FromPrimitive};
pub fn threehumpcamel<T: Float + FromPrimitive>(param: &[T]) -> T {
assert!(param.len() == 2);
let (x1, x2) = (param[0], param[1]);
T::from_f64(2.0).unwrap() * x1.powi(2) - T::from_f64(1.05).unwrap() * x1.powi(4)
+ x1.powi(6) / T::from_f64(6.0).unwrap()
+ x1 * x2
+ x2.powi(2)
}
mod tests {
#[test]
fn test_threehumpcamel_optimum() {
assert!((::threehumpcamel(&[0.0_f32, 0.0_f32])).abs() < ::std::f32::EPSILON);
assert!((::threehumpcamel(&[0.0_f64, 0.0_f64])).abs() < ::std::f64::EPSILON);
}
#[test]
#[should_panic]
fn test_threehumpcamel_param_length() {
::threehumpcamel(&[0.0_f32, -1.0_f32, 0.1_f32]);
}
}