Enum MixedPartialMethod 

pub enum MixedPartialMethod {
    FiniteDifference,
    ForwardFiniteDifference,
    NestedAutodiff,
}

Methods for computing mixed partials.

This used to list ForwardOverReverse, ReverseOverForward and PureForward alongside FiniteDifference — but all three delegated, in one line each, to the finite-difference routine (finding F89). The variants below are the ones that can genuinely differ behind this engine’s black-box objective type; see crate::higher_order::hvp for why nested automatic differentiation cannot.

Variants

FiniteDifference

Central finite differences: O(h²) accurate, evaluates on both sides of the base point. The default and the most accurate available method.

ForwardFiniteDifference

One-sided forward finite differences: O(h) accurate, never evaluates below the base point in any differentiated coordinate. Use it when the objective is undefined or discontinuous on that side.

NestedAutodiff

Nested automatic differentiation. Not available behind this engine’s Fn(&Array1<T>) -> T objective — Self::is_available returns false and HigherOrderEngine::mixed_partial returns a typed error naming the alternative, instead of silently running a finite difference under an autodiff name.

Implementations

impl MixedPartialMethod

pub fn is_available(&self) -> bool

Whether this method can actually run behind the engine’s black-box objective type.

Trait Implementations

impl Clone for MixedPartialMethod

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for MixedPartialMethod

impl Debug for MixedPartialMethod

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for MixedPartialMethod

impl PartialEq for MixedPartialMethod

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for MixedPartialMethod