/*
 * Copyright (c) 2008-2009 Bill Whitacre http://rampancy.g0dsoft.com
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
*/

#include "math_util.h"

void rat_math_util_euler_integrate_real(unsigned int numvars,rat_real *in,rat_real *out,rat_real *chg,rat_real timestep)
{
	register unsigned int i;
	
	for (i=0; i<numvars; i++) out[i]=in[i]+chg[i]*timestep;
}

// why the fuck is this even still in here!?  jesus!
void rat_math_util_rk4_integrate_real(unsigned int numvars,rat_real *in,rat_real *out,rat_real *chg,rat_real timestep)
{
	register unsigned int i;

	for (i=0; i<numvars; i++)
		out[i]=in[i]+(chg[i]+2*chg[i]+2*chg[i]+chg[i])*timestep/6;
}