package de.intevation.flys.artifacts.math.fitting;

public class Quad
extends      Function
{
    public Quad() {
        super(
            "quad",
            "W(Q) = n*Q^2 + m*Q + b",
            new String [] { "n", "m", "b" });
    }

    @Override
    public double value(double x, double [] parameters) {
        // n*Q^2 + m*Q + b <=> Q*(n*Q + m) + b
        return x*(parameters[0]*x + parameters[1]) + parameters[2];
    }

    @Override
    public double [] gradient(double x, double [] parameters) {
        return new double [] { x*x, x, 1d };
    }
}
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