return retour;
}
private static double evaluateX (final MathFunction spline, final double y, double xPrincipal, double xAnnexe) {
final MathFunction xFunction = new MathFunction () {
public double evaluate (double t) {
return spline.evaluate(t) - y;
}
};
return RootFinder.brentDekker (xPrincipal, xAnnexe-1.0E-6, xFunction, 1e-6);