package com.imsl.test.example.math;

import com.imsl.math.*;

/**
 * <p>
 * Computes a cubic spline interpolant with
 * periodic boundary conditions.</p>
 *
 * A cubic spline interpolant to a function is computed. The value of the spline
 * at point 0.23 is printed.
 *
 * @see <a href="CsPeriodicEx1.java">Code</a>
 * @see <a href="doc-files/CsPeriodicEx1.out">Output</a>
 *
 */
public class CsPeriodicEx1 {

    public static void main(String args[]) {
        int n = 11;
        double x[] = new double[n];
        double y[] = new double[n];

        double h = 2. * Math.PI / 15. / 10.;
        for (int k = 0; k < n; k++) {
            x[k] = h * (double) (k);
            y[k] = Math.sin(15.0 * x[k]);
        }

        CsPeriodic cs = new CsPeriodic(x, y);
        double csv = cs.value(0.23);
        System.out.println("The computed cubic spline value at point .23 is "
                + csv);
    }
}