/*
* deriv.h -- ePiX derivative function template
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.0.23
* Last Change: January 06, 2007
*/
/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Andrew D. Hwang
* Department of Mathematics and Computer Science
* College of the Holy Cross
* Worcester, MA, 01610-2395, USA
*/
/*
* ePiX is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* ePiX 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ePiX; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef EPIX_DERIV
#define EPIX_DERIV
#include "constants.h"
namespace ePiX {
// moved from functions.h to hide global constant EPIX_EPSILON
template T deriv(T f(double), double t, double dt=EPIX_EPSILON)
{
return (1.0/dt)*(f(t+0.5*dt) - f(t-0.5*dt));
}
} // end of namespace
#endif /* EPIX_DERIV */