Method call_stable

src/structure/ad.rs:1034–1041

(&self, target: f64)

    type Output = f64;

    fn call_stable(&self, target: f64) -> f64 {
        match self.grad_level {
            0 => (self.f)(Jet::<2>::constant(target)).value(),
            1 => (self.f)(Jet::<2>::new(target, [1.0, 0.0])).dx(),
            2 => (self.f)(Jet::<2>::new(target, [1.0, 0.0])).ddx(),
            _ => unreachable!("grad_level > 2 is not allowed"),
        }
    }
}

/// Scalar version: F works with `Jet<2>`, target is `Jet<2>`.