Enum DerivativeError 

pub enum DerivativeError {
    ZeroChiralityContrast,
    InvalidSingularValueCotangent,
    UnresolvedSingularValue,
    UnequalSingularValueWeights,
}

A stable reason why a requested derivative is unavailable.

Saved metric states encode these reasons independently of their display text.

Variants

ZeroChiralityContrast

The norm of the helicity contrast is not differentiable at zero.

InvalidSingularValueCotangent

Singular-value weights have the wrong length or contain non-finite values.

UnresolvedSingularValue

A nonzero weight requests the derivative of an unresolved singular value.

UnequalSingularValueWeights

Unequal weights at a repeated singular value depend on singular vectors.

Trait Implementations

impl Clone for DerivativeError

fn clone(&self) -> DerivativeError

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for DerivativeError

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

Formats the value using the given formatter.

impl Display for DerivativeError

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

Formats the value using the given formatter.

impl Error for DerivativeError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0: use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0: replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for DerivativeError

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for DerivativeError

impl Eq for DerivativeError

impl StructuralPartialEq for DerivativeError