Java AtomicReference expandSplineRoots(int n)

Description

expand Spline Roots

License

Open Source License

Declaration

private static synchronized void expandSplineRoots(int n) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.util.concurrent.atomic.AtomicReference;

public class Main {
    /**//from w  w  w  . ja v a2s  . c  om
     * The spline coefficient cache
     */
    private final static AtomicReference<float[][][]> coeffRoot = new AtomicReference<float[][][]>();

    private static synchronized void expandSplineRoots(int n) {
        float[][][] oldRoot = coeffRoot.get();
        if (oldRoot != null && oldRoot.length > n) {
            return;
        }

        float[][][] newRoot = new float[n + 1][][];

        // Coefficient for zeroth order spline
        newRoot[0] = new float[][] { { 1.0F } };

        // Compute coefficients for each spline order based on the coefficients from the previous order
        for (int o = 1; o < n + 1; o++) {
            newRoot[o] = new float[o + 1][o + 1];
            for (int i = 0; i < o; i++) {
                for (int p = 0; p < o; p++) {
                    newRoot[o][i][p + 1] += newRoot[o - 1][i][p] / (p + 1);
                    newRoot[o][i + 1][p + 1] -= newRoot[o - 1][i][p] / (p + 1);
                    newRoot[o][i + 1][0] += newRoot[o - 1][i][p] / (p + 1);
                }
            }
        }

        coeffRoot.set(newRoot);
    }
}

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