GaussLegendreQuadrature.java

/*
 * Copyright (C) 2015 Alberto Irurueta Carro (alberto@irurueta.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.irurueta.statistics;

/**
 * Defines constants for Gauss-Legendre quadrature.
 */
public class GaussLegendreQuadrature {
    /**
     * Length of quadrature arrays.
     */
    protected static final int N_GAU = 18;

    /**
     * Y values.
     */
    static final double[] Y = {0.0021695375159141994,
            0.011413521097787704, 0.027972308950302116, 0.051727015600492421,
            0.082502225484340941, 0.12007019910960293, 0.16415283300752470,
            0.21442376986779355, 0.27051082840644336, 0.33199876341447887,
            0.39843234186401943, 0.46931971407375483, 0.54413605556657973,
            0.62232745288031077, 0.70331500465597174, 0.78649910768313447,
            0.87126389619061517, 0.95698180152629142};

    /**
     * W values.
     */
    static final double[] W = {0.0055657196642445571,
            0.012915947284065419, 0.020181515297735382, 0.027298621498568734,
            0.034213810770299537, 0.040875750923643261, 0.047235083490265582,
            0.053244713977759692, 0.058860144245324798, 0.064039797355015485,
            0.068745323835736408, 0.072941885005653087, 0.076598410645870640,
            0.079687828912071670, 0.082187266704339706, 0.084078218979661945,
            0.085346685739338721, 0.085983275670394821};

    /**
     * Constructor.
     */
    protected GaussLegendreQuadrature() {
    }
}