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lammps/src/math_complex.h
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math_complex.h
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/* -*- c++ -*- ----------------------------------------------------------
LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
http://lammps.sandia.gov, Sandia National Laboratories
Steve Plimpton, sjplimp@sandia.gov
Copyright (2003) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the GNU General Public License.
See the README file in the top-level LAMMPS directory.
------------------------------------------------------------------------- */
/* ----------------------------------------------------------------------
Contributing author: Pieter J. in 't Veld (SNL)
------------------------------------------------------------------------- */
#ifndef LMP_MATH_COMPLEX_H
#define LMP_MATH_COMPLEX_H
#define COMPLEX_NULL {0, 0}
namespace LAMMPS_NS {
typedef struct complex {
double re, im; } complex;
}
#define C_MULT(d, x, y) { \
d.re = x.re*y.re-x.im*y.im; \
d.im = x.re*y.im+x.im*y.re; }
#define C_RMULT(d, x, y) { \
register complex t = x; \
d.re = t.re*y.re-t.im*y.im; \
d.im = t.re*y.im+t.im*y.re; }
#define C_CRMULT(d, x, y) { \
register complex t = x; \
d.re = t.re*y.re-t.im*y.im; \
d.im = -t.re*y.im-t.im*y.re; }
#define C_SMULT(d, x, y) { \
d.re = x.re*y; \
d.im = x.im*y; }
#define C_ADD(d, x, y) { \
d.re = x.re+y.re; \
d.im = x.im+y.im; }
#define C_SUBTR(d, x, y) { \
d.re = x.re-y.re; \
d.im = x.im-y.im; }
#define C_CONJ(d, x) { \
d.re = x.re; \
d.im = -x.im; }
#define C_SET(d, x, y) { \
d.re = x; \
d.im = y; }
#define C_ANGLE(d, angle) { \
register double a = angle; \
d.re = cos(a); \
d.im = sin(a); }
#define C_COPY(d, x) { \
memcpy(&d, &x, sizeof(complex)); }
#endif
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