Frequencies<T> class

Frequencies of discrete items.

Example

import 'package:calc/calc.dart';

void main() {
  // Two cats and two other animals
  final frequencies = Frequencies<String>.from([
    'dog',
    'cat',
    'rabbit',
    'cat',
  ]);

  final catPmf = frequencies.pmf('cat'); // --> 0.5
  print('Likelihood of cats based on the seen data: $catPmf');
}

Inheritance

• Object
• Distribution<T>
• DiscreteDistribution<T>
• Frequencies

Constructors

Frequencies.from(Iterable<T> iterable)

Calculates frequencies of discrete items.

factory

Frequencies.fromMap(Map<T, num> masses)

Clones the map, normalizes the map values, and interprets the result as a distribution of observed values.

factory

Properties

entries → Iterable<MapEntry<T, double>>

no setter

hashCode → int

The hash code for this object.

no setter, override

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

values → Iterable<T>

Values in the distribution.

no setter

Methods

map<R>(R f(T value), {T reverse(R value)?}) → DiscreteDistribution<R>

Maps the distribution with the given function.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

pmf(T value) → double

Probability mass function (PMF) tells probability of specific event.

override

sample({Random? random}) → T

Generates a random sample.

override

sampleList(int length, {Random? random}) → List<T>

Generates a list of N random samples.

inherited

toMap() → Map<T, double>

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override