include/maths.h

   1 /*
   2  * $Id$
   3  *
   4  *       This source code is part of
   5  *
   6  *        G   R   O   M   A   C   S
   7  *
   8  * GROningen MAchine for Chemical Simulations
   9  *
  10  *               VERSION 2.0
  11  *
  12  * Copyright (c) 1991-1999
  13  * BIOSON Research Institute, Dept. of Biophysical Chemistry
  14  * University of Groningen, The Netherlands
  15  *
  16  * Please refer to:
  17  * GROMACS: A message-passing parallel molecular dynamics implementation
  18  * H.J.C. Berendsen, D. van der Spoel and R. van Drunen
  19  * Comp. Phys. Comm. 91, 43-56 (1995)
  20  *
  21  * Also check out our WWW page:
  22  * http://md.chem.rug.nl/~gmx
  23  * or e-mail to:
  24  * gromacs@chem.rug.nl
  25  *
  26  * And Hey:
  27  * Good ROcking Metal Altar for Chronical Sinners
  28  */
  29
  30 #ifndef _maths_h
  31 #define _maths_h
  32
  33 static char *SRCID_maths_h = "$Id$";
  34
  35 #ifdef HAVE_IDENT
  36 #ident  "@(#) maths.h 1.11 11/24/92"
  37 #endif /* HAVE_IDENT */
  38
  39 #include <math.h>
  40 #include "typedefs.h"
  41
  42 #ifndef M_PI
  43 #define M_PI            3.14159265358979323846
  44 #endif
  45
  46 #ifndef M_PI_2
  47 #define M_PI_2          1.57079632679489661923
  48 #endif
  49
  50 #ifndef M_2PI
  51 #define M_2PI           6.28318530718
  52 #endif
  53
  54 #ifndef M_SQRT2
  55 #define M_SQRT2 sqrt(2.0)
  56 #endif
  57
  58 #ifdef CPLUSPLUS
  59 extern "C" {
  60 #endif
  61
  62 extern  int             gmx_nint(real a);
  63 extern  real            sign(real x,real y);
  64
  65 #ifdef CPLUSPLUS
  66 }
  67 #endif
  68
  69 #endif  /* _maths_h */