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// Copyright 2018-2020 argmin developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
extern crate argmin;
use argmin::prelude::*;
use argmin::solver::brent::Brent;
/// Test function generalise from Wikipedia example
struct TestFunc {
zero1: f64,
zero2: f64,
}
impl ArgminOp for TestFunc {
// one dimensional problem, no vector needed
type Param = f64;
type Output = f64;
type Hessian = ();
type Jacobian = ();
type Float = f64;
fn apply(&self, p: &Self::Param) -> Result<Self::Output, Error> {
Ok((p + self.zero1) * (p - self.zero2) * (p - self.zero2))
}
}
fn main() {
let cost = TestFunc {
zero1: 3.,
zero2: -1.,
};
let init_param = 0.5;
let solver = Brent::new(-4., 0.5, 1e-11);
let res = Executor::new(cost, solver, init_param)
.add_observer(ArgminSlogLogger::term(), ObserverMode::Always)
.max_iters(100)
.run()
.unwrap();
println!("Result of brent:\n{}", res);
}