Enum LuError 

pub enum LuError {
    Singular {
        rank_deficiency: usize,
        cols: Vec<usize>,
        rows: Vec<Row>,
    },
    Structure(SparseError),
    NoSpike,
    NotFactorized,
}

Error raised by crate::LuFactor::factorize and crate::LuFactor::update.

Variants

Singular

The basis is singular: no acceptable pivot (magnitude above crate::LuOptions::abs_pivot_tol) exists for rank_deficiency columns. cols lists their basis positions and rows the rows left without a pivot, both in increasing order (invariant E1).

After a failed factorization the factor is invalid until the next successful one; after a failed update it still represents the previous basis (Chapter 5.5).

Fields

rank_deficiency: usize

Number of dependent columns, = cols.len() = rows.len().

cols: Vec<usize>

Basis positions of the dependent columns.

rows: Vec<Row>

Rows left without a pivot.

Structure(SparseError)

The basis references do not fit the matrix (Chapter 5.1, B1), or a position is out of range.

NoSpike

crate::LuFactor::update was called without a spike recorded by crate::LuFactor::ftran_for_update since the last change of the factor.

NotFactorized

A solve or an update was requested from a factor that does not hold a valid factorization (never factorized, or the last factorization failed).

Trait Implementations

impl Clone for LuError

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LuError

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

Formats the value using the given formatter.

impl Display for LuError

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

Formats the value using the given formatter.

impl Error for LuError

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 From<SparseError> for LuError

fn from(e: SparseError) -> Self

Converts to this type from the input type.

impl PartialEq for LuError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LuError