category

glicko2_common

Shared internal Glicko-2 numeric helpers for rating updates, volatility search, and scale conversions.

Availability:
logtalk_load(ranking_protocols(loader))
Author: Paulo Moura
Version: 1:0:0
Date: 2026-05-02
Compilation flags:
static
Uses:
avltree
Remarks:
(none)
Inherited public predicates:
(none)

Public predicates

(no local declarations; see entity ancestors if any)

Protected predicates

update_item_parameters/10

Computes the simultaneous Glicko-2 rating, deviation, and volatility update for one item over a rating period using the current dictionaries and aggregated game results.

Compilation flags:
static
Template:
update_item_parameters(Item,ItemResults,Ratings,Deviations,Volatilities,Tau,VolatilityTolerance,UpdatedRating,UpdatedDeviation,UpdatedVolatility)
Mode and number of proofs:
update_item_parameters(+term,+list(compound),+compound,+compound,+compound,+number,+number,-number,-number,-number) - one

to_mu/2

Converts a rating on the external Glicko scale to the internal mu scale.

Compilation flags:
static
Template:
to_mu(Rating,Mu)
Mode and number of proofs:
to_mu(+number,-number) - one

to_phi/2

Converts a rating deviation on the external Glicko scale to the internal phi scale.

Compilation flags:
static
Template:
to_phi(Deviation,Phi)
Mode and number of proofs:
to_phi(+number,-number) - one

to_rating/2

Converts a value on the internal mu scale back to the external Glicko rating scale.

Compilation flags:
static
Template:
to_rating(Mu,Rating)
Mode and number of proofs:
to_rating(+number,-number) - one

to_deviation/2

Converts a value on the internal phi scale back to the external Glicko rating-deviation scale.

Compilation flags:
static
Template:
to_deviation(Phi,Deviation)
Mode and number of proofs:
to_deviation(+number,-number) - one

Private predicates

(no local declarations; see entity ancestors if any)

Operators

(none)