Example: The Akima cubic spline interpolant

import com.imsl.math.*;

public class CsAkimaEx1 {

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

        for (int k = 0; k < n; k++) {
            x[k] = (double) k / (double) (n - 1);
            y[k] = Math.sin(15.0 * x[k]);
        }

        CsAkima cs = new CsAkima(x, y);
        double csv = cs.value(0.25);
        System.out.println("The computed cubic spline value at point .25 is "
                + csv);
    }
}

Output

The computed cubic spline value at point .25 is -0.478185519991867