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Units.h
1 #ifndef OPENMM_UNITS_H_
2 #define OPENMM_UNITS_H_
3 
4 /* -------------------------------------------------------------------------- *
5  * OpenMM *
6  * -------------------------------------------------------------------------- *
7  * This is part of the OpenMM molecular simulation toolkit originating from *
8  * Simbios, the NIH National Center for Physics-Based Simulation of *
9  * Biological Structures at Stanford, funded under the NIH Roadmap for *
10  * Medical Research, grant U54 GM072970. See https://simtk.org. *
11  * *
12  * Portions copyright (c) 2008 Stanford University and the Authors. *
13  * Authors: Peter Eastman *
14  * Contributors: *
15  * *
16  * Permission is hereby granted, free of charge, to any person obtaining a *
17  * copy of this software and associated documentation files (the "Software"), *
18  * to deal in the Software without restriction, including without limitation *
19  * the rights to use, copy, modify, merge, publish, distribute, sublicense, *
20  * and/or sell copies of the Software, and to permit persons to whom the *
21  * Software is furnished to do so, subject to the following conditions: *
22  * *
23  * The above copyright notice and this permission notice shall be included in *
24  * all copies or substantial portions of the Software. *
25  * *
26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
27  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
28  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
29  * THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
30  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
31  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE *
32  * USE OR OTHER DEALINGS IN THE SOFTWARE. *
33  * -------------------------------------------------------------------------- */
34 
35 #include <cmath>
36 
53 namespace OpenMM {
57  static const double NmPerAngstrom = 0.1;
61  static const double AngstromsPerNm = 10.0;
65  static const double PsPerFs = 0.001;
69  static const double FsPerPs = 1000.0;
73  static const double KJPerKcal = 4.184;
77  static const double KcalPerKJ = 1.0/4.184;
81  static const double RadiansPerDegree = 3.1415926535897932385/180.0;
85  static const double DegreesPerRadian = 180.0/3.1415926535897932385;
89  static const double SigmaPerVdwRadius = 1.7817974362806786095;
93  static const double VdwRadiusPerSigma = .56123102415468649070;
94 
95 } // namespace OpenMM
96 
97 #endif /*OPENMM_UNITS_H_*/