Using the knowledge in computational language in C++ it is possible to write a code that Out of range atoms:
#include <cmath>
#include "pppm_tip4p.h"
#include "atom.h"
#include "domain.h"
#include "force.h"
#include "memory.h"
#include "error.h"
#include "math_const.h"
using namespace LAMMPS_NS;
using namespace MathConst;
#define OFFSET 16384
#ifdef FFT_SINGLE
#define ZEROF 0.0f
#define ONEF 1.0f
#else
#define ZEROF 0.0
#define ONEF 1.0
#endif
void PPPMTIP4P::init()
{
// TIP4P PPPM requires newton on, b/c it computes forces on ghost atoms
if (force->newton == 0)
error->all(FLERR,"Kspace style pppm/tip4p requires newton on");
PPPM::init();
}
void PPPMTIP4P::particle_map()
{
int nx,ny,nz,iH1,iH2;
double *xi,xM[3];
int *type = atom->type;
double **x = atom->x;
int nlocal = atom->nlocal;
if (!std::isfinite(boxlo[0]) || !std::isfinite(boxlo[1]) || !std::isfinite(boxlo[2]))
error->one(FLERR,"Non-numeric box dimensions - simulation unstable");
int flag = 0;
for (int i = 0; i < nlocal; i++) {
if (type[i] == typeO) {
find_M(i,iH1,iH2,xM);
xi = xM;
} else xi = x[i];
nx = static_cast<int> ((xi[0]-boxlo[0])*delxinv+shift) - OFFSET;
ny = static_cast<int> ((xi[1]-boxlo[1])*delyinv+shift) - OFFSET;
nz = static_cast<int> ((xi[2]-boxlo[2])*delzinv+shift) - OFFSET;
part2grid[i][0] = nx;
part2grid[i][1] = ny;
part2grid[i][2] = nz;
if (nx+nlower < nxlo_out || nx+nupper > nxhi_out ||
ny+nlower < nylo_out || ny+nupper > nyhi_out ||
nz+nlower < nzlo_out || nz+nupper > nzhi_out) flag++;
}
int flag_all;
MPI_Allreduce(&flag,&flag_all,1,MPI_INT,MPI_SUM,world);
if (flag_all) error->all(FLERR,"Out of range atoms - cannot compute PPPM");
}
void PPPMTIP4P::make_rho()
{
int i,l,m,n,nx,ny,nz,mx,my,mz,iH1,iH2;
FFT_SCALAR dx,dy,dz,x0,y0,z0;
double *xi,xM[3];
FFT_SCALAR *vec = &density_brick[nzlo_out][nylo_out][nxlo_out];
for (i = 0; i < ngrid; i++) vec[i] = ZEROF;
int *type = atom->type;
double *q = atom->q;
double **x = atom->x;
int nlocal = atom->nlocal;
for (int i = 0; i < nlocal; i++) {
if (type[i] == typeO) {
find_M(i,iH1,iH2,xM);
xi = xM;
} else xi = x[i];
nx = part2grid[i][0];
ny = part2grid[i][1];
nz = part2grid[i][2];
dx = nx+shiftone - (xi[0]-boxlo[0])*delxinv;
dy = ny+shiftone - (xi[1]-boxlo[1])*delyinv;
dz = nz+shiftone - (xi[2]-boxlo[2])*delzinv;
compute_rho1d(dx,dy,dz);
z0 = delvolinv * q[i];
for (n = nlower; n <= nupper; n++) {
mz = n+nz;
y0 = z0*rho1d[2][n];
for (m = nlower; m <= nupper; m++) {
my = m+ny;
x0 = y0*rho1d[1][m];
for (l = nlower; l <= nupper; l++) {
mx = l+nx;
density_brick[mz][my][mx] += x0*rho1d[0][l];
}
}
}
}
}
See more about C++ at brainly.com/question/19705654
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