/*
* 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.integration;
import org.jgrasstools.gears.libs.modules.ModelsEngine;
/**
* @author Silvia Franceschi (www.hydrologis.com)
*/
public class ConvolutionExponentialPeakflow extends SimpsonIntegral implements IntegrableFunction {
private double k = 0f;
private double t = 0.0;
private final double[][] ampi_sub;
/**
* Calculates the integral of the exponential equation
*
* @param lowerintegrationlimit
* @param upperintegrationlimit
* @param maximalsteps
* @param integrationaccuracy
* @param invasoConstant
* @param timeDischargeInterpolator
*/
public ConvolutionExponentialPeakflow( double lowerintegrationlimit, double upperintegrationlimit, int maximalsteps,
double integrationaccuracy, double[][] ampifunction, double invasoConstant, double time ) {
lowerlimit = lowerintegrationlimit;
upperlimit = upperintegrationlimit;
maxsteps = maximalsteps;
accuracy = integrationaccuracy;
ampi_sub = ampifunction;
strapezoid = 0f;
k = invasoConstant;
t = time;
}
protected double equation( double time ) {
double d = 1.0 / k * Math.exp(-t / k) * ModelsEngine.width_interpolate(ampi_sub, time, 0, 1);
return d;
}
public double integrate() {
return simpson();
}
}