Fsrs

class Fsrs(val w: List<Double> = FsrsParameters.defaultParameters)

FSRS6 implementation based on https://github.com/open-spaced-repetition/awesome-fsrs/wiki/The-Algorithm

Parameters

The parameters for the FSRS algorithm.

Constructors

Fsrs

constructor(w: List<Double> = FsrsParameters.defaultParameters)

Properties

val w: List<Double>

Functions

initialDifficulty

fun initialDifficulty(rating: FsrsRating): Double

Calculates the initial difficulty for a given rating.

initialStability

fun initialStability(rating: FsrsRating): Double

Calculates the initial stability for a given rating.

nextDifficulty

fun nextDifficulty(difficulty: Double, rating: FsrsRating): Double

Calculates the next stability based on the current stability, difficulty, and rating.

nextStabilityShortTerm

fun nextStabilityShortTerm(stability: Double, rating: FsrsRating): Double

Calculates the next stability for short-term reviews based on the current stability and rating.

retrievability

fun retrievability(t: Double, s: Double): Double

Calculates the retrievability based on elapsed time and stability.

stabilityOnLapse

fun stabilityOnLapse(difficulty: Double, stability: Double, retrievability: Double): Double

Calculates the next stability for items that have lapsed (i.e., rated as AGAIN) based on the current difficulty, stability, and retrievability.

stabilityOnRecall

fun stabilityOnRecall(difficulty: Double, stability: Double, retrievability: Double, rating: FsrsRating): Double

Calculates the next stability for long-term reviews based on the current difficulty, stability, retrievability, and rating. In case the rating is AGAIN, the stabilityOnLapse function should be used instead.