/*
* JGrass - Free Open Source Java GIS http://www.jgrass.org
* (C) HydroloGIS - www.hydrologis.com
*
* This library is free software; you can redistribute it and/or modify it under
* the terms of the GNU Library General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option) any
* later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more
* details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; if not, write to the Free Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.jgrasstools.gears.utils.math.interpolation.splines;
/**
* This class represents a cubic polynomial
*
* @author Tim Lambert (http://www.cse.unsw.edu.au/~lambert/)
*/
public class Cubic {
double a, b, c, d; /* a + b*u + c*u^2 +d*u^3 */
public Cubic( double a, double b, double c, double d ) {
this.a = a;
this.b = b;
this.c = c;
this.d = d;
}
/**
* evaluate cubic
*/
public double eval( double u ) {
return (((d * u) + c) * u + b) * u + a;
}
}