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/**
* $Id$
* ***** BEGIN GPL/BL DUAL LICENSE BLOCK *****
*
* This program 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. The Blender
* Foundation also sells licenses for use in proprietary software under
* the Blender License. See http://www.blender.org/BL/ for information
* about this.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL/BL DUAL LICENSE BLOCK *****
*/
/*
*
* Template Numerical Toolkit (TNT): Linear Algebra Module
*
* Mathematical and Computational Sciences Division
* National Institute of Technology,
* Gaithersburg, MD USA
*
*
* This software was developed at the National Institute of Standards and
* Technology (NIST) by employees of the Federal Government in the course
* of their official duties. Pursuant to title 17 Section 105 of the
* United States Code, this software is not subject to copyright protection
* and is in the public domain. The Template Numerical Toolkit (TNT) is
* an experimental system. NIST assumes no responsibility whatsoever for
* its use by other parties, and makes no guarantees, expressed or implied,
* about its quality, reliability, or any other characteristic.
*
* BETA VERSION INCOMPLETE AND SUBJECT TO CHANGE
* see http://math.nist.gov/tnt for latest updates.
*
*/
// Header file for scalar math functions
#ifndef TNTMATH_H
#define TNTMATH_H
// conventional functions required by several matrix algorithms
namespace TNT
{
struct TNTException {
int i;
};
inline double abs(double t)
{
return ( t > 0 ? t : -t);
}
inline double min(double a, double b)
{
return (a < b ? a : b);
}
inline double max(double a, double b)
{
return (a > b ? a : b);
}
inline float abs(float t)
{
return ( t > 0 ? t : -t);
}
inline float min(float a, float b)
{
return (a < b ? a : b);
}
inline int min(int a,int b) {
return (a < b ? a : b);
}
inline float max(float a, float b)
{
return (a > b ? a : b);
}
inline double sign(double a)
{
return (a > 0 ? 1.0 : -1.0);
}
inline double sign(double a,double b) {
return (b >= 0.0 ? TNT::abs(a) : -TNT::abs(a));
}
inline float sign(float a,float b) {
return (b >= 0.0f ? TNT::abs(a) : -TNT::abs(a));
}
inline float sign(float a)
{
return (a > 0.0 ? 1.0f : -1.0f);
}
inline float pythag(float a, float b)
{
float absa,absb;
absa = abs(a);
absb = abs(b);
if (absa > absb) {
float sqr = absb/absa;
sqr *= sqr;
return absa * float(sqrt(1 + sqr));
} else {
if (absb > float(0)) {
float sqr = absa/absb;
sqr *= sqr;
return absb * float(sqrt(1 + sqr));
} else {
return float(0);
}
}
}
inline double pythag(double a, double b)
{
double absa,absb;
absa = abs(a);
absb = abs(b);
if (absa > absb) {
double sqr = absb/absa;
sqr *= sqr;
return absa * double(sqrt(1 + sqr));
} else {
if (absb > double(0)) {
double sqr = absa/absb;
sqr *= sqr;
return absb * double(sqrt(1 + sqr));
} else {
return double(0);
}
}
}
} /* namespace TNT */
#endif
/* TNTMATH_H */
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