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43 #include "gromacs/commandline/pargs.h"
44 #include "gromacs/commandline/viewit.h"
45 #include "gromacs/correlationfunctions/autocorr.h"
46 #include "gromacs/fileio/confio.h"
47 #include "gromacs/fileio/trxio.h"
48 #include "gromacs/fileio/xvgr.h"
49 #include "gromacs/gmxana/gmx_ana.h"
50 #include "gromacs/gmxana/gstat.h"
51 #include "gromacs/gmxana/princ.h"
52 #include "gromacs/math/functions.h"
53 #include "gromacs/math/utilities.h"
54 #include "gromacs/math/vec.h"
55 #include "gromacs/pbcutil/rmpbc.h"
56 #include "gromacs/topology/index.h"
57 #include "gromacs/topology/topology.h"
58 #include "gromacs/utility/arraysize.h"
59 #include "gromacs/utility/fatalerror.h"
60 #include "gromacs/utility/futil.h"
61 #include "gromacs/utility/smalloc.h"
63 static real calc_gyro(rvec x[],
76 real gyro, dx2, m0, Itot;
81 principal_comp(gnx, index, atom, x, trans, d);
87 for (m = 0; (m < DIM); m++)
89 d[m] = std::sqrt(d[m] / tm);
91 /* rotate_atoms(gnx,index,x,trans); */
94 for (i = 0; (i < gnx); i++)
99 m0 = std::abs(atom[ii].q);
105 for (m = 0; (m < DIM); m++)
107 dx2 = x[ii][m] * x[ii][m];
111 gyro = comp[XX] + comp[YY] + comp[ZZ];
113 for (m = 0; (m < DIM); m++)
115 gvec[m] = std::sqrt((gyro - comp[m]) / tm);
118 return std::sqrt(gyro / tm);
121 static void calc_gyro_z(rvec x[], matrix box, int gnx, const int index[], t_atom atom[], int nz, real time, FILE* out)
123 static dvec* inertia = nullptr;
124 static double* tm = nullptr;
126 real zf, w, sdet, e1, e2;
128 if (inertia == nullptr)
134 for (i = 0; i < nz; i++)
136 clear_dvec(inertia[i]);
140 for (i = 0; (i < gnx); i++)
143 zf = nz * x[ii][ZZ] / box[ZZ][ZZ];
152 for (j = 0; j < 2; j++)
154 zi = static_cast<int>(zf + j);
159 w = atom[ii].m * (1 + std::cos(M_PI * (zf - zi)));
160 inertia[zi][0] += w * gmx::square(x[ii][YY]);
161 inertia[zi][1] += w * gmx::square(x[ii][XX]);
162 inertia[zi][2] -= w * x[ii][XX] * x[ii][YY];
166 fprintf(out, "%10g", time);
167 for (j = 0; j < nz; j++)
169 for (i = 0; i < 3; i++)
171 inertia[j][i] /= tm[j];
173 sdet = std::sqrt(gmx::square(inertia[j][0] - inertia[j][1]) + 4 * gmx::square(inertia[j][2]));
174 e1 = std::sqrt(0.5 * (inertia[j][0] + inertia[j][1] + sdet));
175 e2 = std::sqrt(0.5 * (inertia[j][0] + inertia[j][1] - sdet));
176 fprintf(out, " %5.3f %5.3f", e1, e2);
182 int gmx_gyrate(int argc, char* argv[])
184 const char* desc[] = {
185 "[THISMODULE] computes the radius of gyration of a molecule",
186 "and the radii of gyration about the [IT]x[it]-, [IT]y[it]- and [IT]z[it]-axes,",
187 "as a function of time. The atoms are explicitly mass weighted.[PAR]",
188 "The axis components corresponds to the mass-weighted root-mean-square",
189 "of the radii components orthogonal to each axis, for example:[PAR]",
190 "Rg(x) = sqrt((sum_i m_i (R_i(y)^2 + R_i(z)^2))/(sum_i m_i)).[PAR]",
191 "With the [TT]-nmol[tt] option the radius of gyration will be calculated",
192 "for multiple molecules by splitting the analysis group in equally",
194 "With the option [TT]-nz[tt] 2D radii of gyration in the [IT]x-y[it] plane",
195 "of slices along the [IT]z[it]-axis are calculated."
197 static int nmol = 1, nz = 0;
198 static gmx_bool bQ = FALSE, bRot = FALSE, bMOI = FALSE;
200 { "-nmol", FALSE, etINT, { &nmol }, "The number of molecules to analyze" },
205 "Use absolute value of the charge of an atom as weighting factor instead of mass" },
210 "Calculate the radii of gyration about the principal axes." },
215 "Calculate the moments of inertia (defined by the principal axes)." },
220 "Calculate the 2D radii of gyration of this number of slices along the z-axis" },
227 rvec xcm, gvec, gvec1;
230 real** moi_trans = nullptr;
231 int max_moi = 0, delta_moi = 100;
232 rvec d, d1; /* eigenvalues of inertia tensor */
233 real t, t0, tm, gyro;
236 int j, m, gnx, nam, mol;
238 gmx_output_env_t* oenv;
239 gmx_rmpbc_t gpbc = nullptr;
240 const char* leg[] = { "Rg", "Rg\\sX\\N", "Rg\\sY\\N", "Rg\\sZ\\N" };
241 const char* legI[] = { "Itot", "I1", "I2", "I3" };
242 #define NLEG asize(leg)
244 { efTRX, "-f", nullptr, ffREAD }, { efTPS, nullptr, nullptr, ffREAD },
245 { efNDX, nullptr, nullptr, ffOPTRD }, { efXVG, nullptr, "gyrate", ffWRITE },
246 { efXVG, "-acf", "moi-acf", ffOPTWR },
248 #define NFILE asize(fnm)
253 ppa = add_acf_pargs(&npargs, pa);
255 if (!parse_common_args(&argc, argv, PCA_CAN_TIME | PCA_CAN_VIEW, NFILE, fnm, npargs, ppa,
256 asize(desc), desc, 0, nullptr, &oenv))
261 bACF = opt2bSet("-acf", NFILE, fnm);
262 if (bACF && nmol != 1)
264 gmx_fatal(FARGS, "Can only do acf with nmol=1");
266 bRot = bRot || bMOI || bACF;
273 printf("Will rotate system along principal axes\n");
274 snew(moi_trans, DIM);
278 printf("Will print moments of inertia\n");
283 printf("Will print radius normalised by charge\n");
286 read_tps_conf(ftp2fn(efTPS, NFILE, fnm), &top, &ePBC, &x, nullptr, box, TRUE);
287 get_index(&top.atoms, ftp2fn_null(efNDX, NFILE, fnm), 1, &gnx, &index, &grpname);
289 if (nmol > gnx || gnx % nmol != 0)
291 gmx_fatal(FARGS, "The number of atoms in the group (%d) is not a multiple of nmol (%d)", gnx, nmol);
295 natoms = read_first_x(oenv, &status, ftp2fn(efTRX, NFILE, fnm), &t, &x, box);
302 out = xvgropen(ftp2fn(efXVG, NFILE, fnm), "Radius of Charge (total and around axes)",
303 "Time (ps)", "Rg (nm)", oenv);
307 out = xvgropen(ftp2fn(efXVG, NFILE, fnm), "Moments of inertia (total and around axes)",
308 "Time (ps)", "I (a.m.u. nm\\S2\\N)", oenv);
312 out = xvgropen(ftp2fn(efXVG, NFILE, fnm), "Radius of gyration (total and around axes)",
313 "Time (ps)", "Rg (nm)", oenv);
317 xvgr_legend(out, NLEG, legI, oenv);
323 if (output_env_get_print_xvgr_codes(oenv))
325 fprintf(out, "@ subtitle \"Axes are principal component axes\"\n");
328 xvgr_legend(out, NLEG, leg, oenv);
332 gpbc = gmx_rmpbc_init(&top.idef, ePBC, natoms);
338 gmx_rmpbc_copy(gpbc, natoms, box, x, x_s);
345 for (mol = 0; mol < nmol; mol++)
347 tm = sub_xcm(nz == 0 ? x_s : x, nam, index + mol * nam, top.atoms.atom, xcm, bQ);
350 gyro += calc_gyro(x_s, nam, index + mol * nam, top.atoms.atom, tm, gvec1, d1, bQ,
355 calc_gyro_z(x, box, nam, index + mol * nam, top.atoms.atom, nz, t, out);
357 rvec_inc(gvec, gvec1);
363 svmul(1.0 / nmol, gvec, gvec);
364 svmul(1.0 / nmol, d, d);
373 max_moi += delta_moi;
374 for (m = 0; (m < DIM); m++)
376 srenew(moi_trans[m], max_moi * DIM);
379 for (m = 0; (m < DIM); m++)
381 copy_rvec(trans[m], moi_trans[m] + DIM * j);
383 fprintf(out, "%10g %10g %10g %10g %10g\n", t, gyro, d[XX], d[YY], d[ZZ]);
387 fprintf(out, "%10g %10g %10g %10g %10g\n", t, gyro, gvec[XX], gvec[YY], gvec[ZZ]);
391 } while (read_next_x(oenv, status, &t, x, box));
395 gmx_rmpbc_done(gpbc);
402 int mode = eacVector;
404 do_autocorr(opt2fn("-acf", NFILE, fnm), oenv, "Moment of inertia vector ACF", j, 3,
405 moi_trans, (t - t0) / j, mode, FALSE);
406 do_view(oenv, opt2fn("-acf", NFILE, fnm), "-nxy");
409 do_view(oenv, ftp2fn(efXVG, NFILE, fnm), "-nxy");