Struct PredicateHistogram 

pub struct PredicateHistogram { /* private fields */ }

Frequency distribution of predicates in an RDF graph.

Maps each predicate IRI to the count of triples that use it.

Implementations

impl PredicateHistogram

pub fn new() -> Self

pub fn record(&mut self, predicate: &str)

Record a triple with this predicate.

pub fn remove(&mut self, predicate: &str)

Remove a triple with this predicate.

pub fn frequency(&self, predicate: &str) -> u64

Frequency (triple count) for predicate.

pub fn relative_frequency(&self, predicate: &str) -> f64

Relative frequency (fraction of all triples) for predicate.

pub fn total(&self) -> u64

Total triple count across all predicates.

pub fn distinct_count(&self) -> usize

Number of distinct predicates.

pub fn top_n(&self, n: usize) -> Vec<(String, u64)>

Top-N predicates by frequency.

pub fn bottom_n(&self, n: usize) -> Vec<(String, u64)>

Bottom-N predicates by frequency (least used).

pub fn all_sorted(&self) -> Vec<(String, u64)>

All frequencies, sorted alphabetically by predicate IRI.

Trait Implementations

impl Clone for PredicateHistogram

fn clone(&self) -> PredicateHistogram

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for PredicateHistogram

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

Formats the value using the given formatter.

impl Default for PredicateHistogram

fn default() -> PredicateHistogram

Returns the “default value” for a type.