/**
* Copyright (C) 2016 - present by OpenGamma Inc. and the OpenGamma group of companies
*
* Please see distribution for license.
*/
package com.opengamma.strata.pricer.impl.tree;
import com.opengamma.strata.collect.array.DoubleArray;
/**
* Lattice specification interface.
* <p>
* An implementation of the lattice specification defines construction of binomial and trinomial trees, and computes
* transition probabilities and state steps.
* <p>
* Reference: Y. Iwashita, "Tree Option Pricing Models" OpenGamma Quantitative Research 23.
*/
public interface LatticeSpecification {
/**
* Computes parameters for uniform trinomial tree.
* <p>
* The interest rate must be zero-coupon continuously compounded rate.
* <p>
* The trinomial tree parameters are represented as {@code DoubleArray} containing [0] up factor, [1] middle factor,
* [2] down factor, [3] up probability, [4] middle probability, [5] down probability.
*
* @param volatility the volatility
* @param interestRate the interest rate
* @param dt the time step
* @return the trinomial tree parameters
*/
public abstract DoubleArray getParametersTrinomial(double volatility, double interestRate, double dt);
}