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41 #include "gromacs/utility/smalloc.h"
42 #include "gromacs/utility/futil.h"
43 #include "gromacs/math/utilities.h"
44 #include "gromacs/utility/fatalerror.h"
45 #include "gromacs/math/vec.h"
47 #include "gromacs/topology/index.h"
48 #include "gromacs/fileio/strdb.h"
49 #include "gromacs/fileio/tpxio.h"
50 #include "gromacs/fileio/trxio.h"
53 #include "gromacs/fileio/gmxfio.h"
54 #include "gromacs/fileio/xvgr.h"
59 typedef struct gmx_structurefactors {
61 int *p; /* proton number */
62 int *n; /* neutron number */
63 /* Parameters for the Cromer Mann fit */
64 real **a; /* parameter a */
65 real **b; /* parameter b */
66 real *c; /* parameter c */
67 char **atomnm; /* atomname */
69 } gmx_structurefactors;
71 typedef struct reduced_atom{
77 typedef struct structure_factor
91 extern int * create_indexed_atom_type (reduced_atom_t * atm, int size)
94 * create an index of the atom types found in a group
95 * i.e.: for water index_atp[0]=type_number_of_O and
96 * index_atp[1]=type_number_of_H
98 * the last element is set to 0
100 int *index_atp, i, i_tmp, j;
102 reduced_atom *att = (reduced_atom *)atm;
106 index_atp[0] = att[0].t;
107 for (i = 1; i < size; i++)
109 for (j = 0; j < i_tmp; j++)
111 if (att[i].t == index_atp[j])
116 if (j == i_tmp) /* i.e. no indexed atom type is == to atm[i].t */
119 srenew (index_atp, i_tmp * sizeof (int));
120 index_atp[i_tmp - 1] = att[i].t;
124 srenew (index_atp, i_tmp * sizeof (int));
125 index_atp[i_tmp - 1] = 0;
131 extern t_complex *** rc_tensor_allocation(int x, int y, int z)
138 snew(t[0][0], x*y*z);
140 for (j = 1; j < y; j++)
142 t[0][j] = t[0][j-1] + z;
144 for (i = 1; i < x; i++)
147 t[i][0] = t[i-1][0] + y*z;
148 for (j = 1; j < y; j++)
150 t[i][j] = t[i][j-1] + z;
157 extern void compute_structure_factor (structure_factor_t * sft, matrix box,
158 reduced_atom_t * red, int isize, real start_q,
159 real end_q, int group, real **sf_table)
161 structure_factor *sf = (structure_factor *)sft;
162 reduced_atom *redt = (reduced_atom *)red;
166 real kdotx, asf, kx, ky, kz, krr;
167 int kr, maxkx, maxky, maxkz, i, j, k, p, *counter;
170 k_factor[XX] = 2 * M_PI / box[XX][XX];
171 k_factor[YY] = 2 * M_PI / box[YY][YY];
172 k_factor[ZZ] = 2 * M_PI / box[ZZ][ZZ];
174 maxkx = (int) (end_q / k_factor[XX] + 0.5);
175 maxky = (int) (end_q / k_factor[YY] + 0.5);
176 maxkz = (int) (end_q / k_factor[ZZ] + 0.5);
178 snew (counter, sf->n_angles);
180 tmpSF = rc_tensor_allocation(maxkx, maxky, maxkz);
183 * compute real and imaginary part of the structure factor for every
186 fprintf(stderr, "\n");
187 for (i = 0; i < maxkx; i++)
189 fprintf (stderr, "\rdone %3.1f%% ", (double)(100.0*(i+1))/maxkx);
190 kx = i * k_factor[XX];
191 for (j = 0; j < maxky; j++)
193 ky = j * k_factor[YY];
194 for (k = 0; k < maxkz; k++)
196 if (i != 0 || j != 0 || k != 0)
198 kz = k * k_factor[ZZ];
199 krr = sqrt (sqr (kx) + sqr (ky) + sqr (kz));
200 if (krr >= start_q && krr <= end_q)
202 kr = (int) (krr/sf->ref_k + 0.5);
203 if (kr < sf->n_angles)
205 counter[kr]++; /* will be used for the copmutation
207 for (p = 0; p < isize; p++)
209 asf = sf_table[redt[p].t][kr];
211 kdotx = kx * redt[p].x[XX] +
212 ky * redt[p].x[YY] + kz * redt[p].x[ZZ];
214 tmpSF[i][j][k].re += cos (kdotx) * asf;
215 tmpSF[i][j][k].im += sin (kdotx) * asf;
222 } /* end loop on i */
224 * compute the square modulus of the structure factor, averaging on the surface
225 * kx*kx + ky*ky + kz*kz = krr*krr
226 * note that this is correct only for a (on the macroscopic scale)
229 for (i = 0; i < maxkx; i++)
231 kx = i * k_factor[XX]; for (j = 0; j < maxky; j++)
233 ky = j * k_factor[YY]; for (k = 0; k < maxkz; k++)
235 kz = k * k_factor[ZZ]; krr = sqrt (sqr (kx) + sqr (ky)
236 + sqr (kz)); if (krr >= start_q && krr <= end_q)
238 kr = (int) (krr / sf->ref_k + 0.5);
239 if (kr < sf->n_angles && counter[kr] != 0)
242 (sqr (tmpSF[i][j][k].re) +
243 sqr (tmpSF[i][j][k].im))/ counter[kr];
256 extern gmx_structurefactors_t *gmx_structurefactors_init(const char *datfn)
259 /* Read the database for the structure factor of the different atoms */
263 gmx_structurefactors *gsf;
264 double a1, a2, a3, a4, b1, b2, b3, b4, c;
274 snew(gsf->atomnm, nralloc);
275 snew(gsf->a, nralloc);
276 snew(gsf->b, nralloc);
277 snew(gsf->c, nralloc);
278 snew(gsf->p, nralloc);
280 gsf->nratoms = line_no;
281 while (get_a_line(fp, line, STRLEN))
284 if (sscanf(line, "%s %d %lf %lf %lf %lf %lf %lf %lf %lf %lf",
285 atomn, &p, &a1, &a2, &a3, &a4, &b1, &b2, &b3, &b4, &c) == 11)
287 gsf->atomnm[i] = strdup(atomn);
301 gsf->nratoms = line_no;
302 if (line_no == nralloc)
305 srenew(gsf->atomnm, nralloc);
306 srenew(gsf->a, nralloc);
307 srenew(gsf->b, nralloc);
308 srenew(gsf->c, nralloc);
309 srenew(gsf->p, nralloc);
314 fprintf(stderr, "WARNING: Error in file %s at line %d ignored\n",
319 srenew(gsf->atomnm, gsf->nratoms);
320 srenew(gsf->a, gsf->nratoms);
321 srenew(gsf->b, gsf->nratoms);
322 srenew(gsf->c, gsf->nratoms);
323 srenew(gsf->p, gsf->nratoms);
327 return (gmx_structurefactors_t *) gsf;
332 extern void rearrange_atoms (reduced_atom_t * positions, t_trxframe *fr, atom_id * index,
333 int isize, t_topology * top, gmx_bool flag, gmx_structurefactors_t *gsf)
334 /* given the group's index, return the (continuous) array of atoms */
338 reduced_atom *pos = (reduced_atom *)positions;
342 for (i = 0; i < isize; i++)
345 return_atom_type (*(top->atoms.atomname[index[i]]), gsf);
348 for (i = 0; i < isize; i++)
350 copy_rvec (fr->x[index[i]], pos[i].x);
355 extern int return_atom_type (const char *name, gmx_structurefactors_t *gsf)
362 { "CH1", 1 }, { "CH2", 2 }, { "CH3", 3 },
363 { "CS1", 1 }, { "CS2", 2 }, { "CS3", 3 },
364 { "CP1", 1 }, { "CP2", 2 }, { "CP3", 3 }
372 gmx_structurefactors *gsft = (gmx_structurefactors *)gsf;
374 NCMT = gsft->nratoms;
378 for (i = 0; (i < asize(uh)); i++)
380 if (strcmp(name, uh[i].name) == 0)
382 return NCMT-1+uh[i].nh;
386 for (i = 0; (i < NCMT); i++)
388 if (strncmp (name, gsft->atomnm[i], strlen(gsft->atomnm[i])) == 0)
397 gmx_fatal(FARGS, "\nError: atom (%s) not in list (%d types checked)!\n",
403 for (i = 0; i < cnt; i++)
405 if (strlen(gsft->atomnm[tndx[i]]) > (size_t)nrc)
407 nrc = strlen(gsft->atomnm[tndx[i]]);
418 extern int gmx_structurefactors_get_sf(gmx_structurefactors_t *gsf, int elem, real a[4], real b[4], real *c)
423 gmx_structurefactors *gsft = (gmx_structurefactors *)gsf;
426 for (i = 0; i < 4; i++)
428 a[i] = gsft->a[elem][i];
429 b[i] = gsft->b[elem][i];
437 extern int do_scattering_intensity (const char* fnTPS, const char* fnNDX,
438 const char* fnXVG, const char *fnTRX,
440 real start_q, real end_q,
441 real energy, int ng, const output_env_t oenv)
443 int i, *isize, flags = TRX_READ_X, **index_atp;
445 char **grpname, title[STRLEN];
450 reduced_atom_t **red;
451 structure_factor *sf;
458 gmx_structurefactors_t *gmx_sf;
466 gmx_sf = gmx_structurefactors_init(fnDAT);
468 success = gmx_structurefactors_get_sf(gmx_sf, 0, a, b, &c);
473 /* Read the topology informations */
474 read_tps_conf (fnTPS, title, &top, &ePBC, &xtop, NULL, box, TRUE);
477 /* groups stuff... */
482 fprintf (stderr, "\nSelect %d group%s\n", ng,
486 get_index (&top.atoms, fnNDX, ng, isize, index, grpname);
490 rd_index (fnNDX, ng, isize, index, grpname);
493 /* The first time we read data is a little special */
494 read_first_frame (oenv, &status, fnTRX, &fr, flags);
496 sf->total_n_atoms = fr.natoms;
499 snew (index_atp, ng);
501 r_tmp = max (box[XX][XX], box[YY][YY]);
502 r_tmp = (double) max (box[ZZ][ZZ], r_tmp);
504 sf->ref_k = (2.0 * M_PI) / (r_tmp);
505 /* ref_k will be the reference momentum unit */
506 sf->n_angles = (int) (end_q / sf->ref_k + 0.5);
509 for (i = 0; i < ng; i++)
511 snew (sf->F[i], sf->n_angles);
513 for (i = 0; i < ng; i++)
515 snew (red[i], isize[i]);
516 rearrange_atoms (red[i], &fr, index[i], isize[i], &top, TRUE, gmx_sf);
517 index_atp[i] = create_indexed_atom_type (red[i], isize[i]);
520 sf_table = compute_scattering_factor_table (gmx_sf, (structure_factor_t *)sf);
523 /* This is the main loop over frames */
528 for (i = 0; i < ng; i++)
530 rearrange_atoms (red[i], &fr, index[i], isize[i], &top, FALSE, gmx_sf);
532 compute_structure_factor ((structure_factor_t *)sf, box, red[i], isize[i],
533 start_q, end_q, i, sf_table);
537 while (read_next_frame (oenv, status, &fr));
539 save_data ((structure_factor_t *)sf, fnXVG, ng, start_q, end_q, oenv);
545 gmx_structurefactors_done(gmx_sf);
551 extern void save_data (structure_factor_t *sft, const char *file, int ngrps,
552 real start_q, real end_q, const output_env_t oenv)
557 double *tmp, polarization_factor, A;
559 structure_factor *sf = (structure_factor *)sft;
561 fp = xvgropen (file, "Scattering Intensity", "q (1/nm)",
562 "Intensity (a.u.)", oenv);
566 for (g = 0; g < ngrps; g++)
568 for (i = 0; i < sf->n_angles; i++)
572 * theta is half the angle between incoming and scattered vectors.
574 * polar. fact. = 0.5*(1+cos^2(2*theta)) = 1 - 0.5 * sin^2(2*theta)
576 * sin(theta) = q/(2k) := A -> sin^2(theta) = 4*A^2 (1-A^2) ->
577 * -> 0.5*(1+cos^2(2*theta)) = 1 - 2 A^2 (1-A^2)
579 A = (double) (i * sf->ref_k) / (2.0 * sf->momentum);
580 polarization_factor = 1 - 2.0 * sqr (A) * (1 - sqr (A));
581 sf->F[g][i] *= polarization_factor;
584 for (i = 0; i < sf->n_angles; i++)
586 if (i * sf->ref_k >= start_q && i * sf->ref_k <= end_q)
588 fprintf (fp, "%10.5f ", i * sf->ref_k);
589 for (g = 0; g < ngrps; g++)
591 fprintf (fp, " %10.5f ", (sf->F[g][i]) /( sf->total_n_atoms*
602 extern double CMSF (gmx_structurefactors_t *gsf, int type, int nh, double lambda, double sin_theta)
604 * return Cromer-Mann fit for the atomic scattering factor:
605 * sin_theta is the sine of half the angle between incoming and scattered
606 * vectors. See g_sq.h for a short description of CM fit.
610 double tmp = 0.0, k2;
619 * f0[k] = c + [SUM a_i*EXP(-b_i*(k^2)) ]
629 tmp = (CMSF (gsf, return_atom_type ("C", gsf), 0, lambda, sin_theta) +
630 nh*CMSF (gsf, return_atom_type ("H", gsf), 0, lambda, sin_theta));
635 k2 = (sqr (sin_theta) / sqr (10.0 * lambda));
636 success = gmx_structurefactors_get_sf(gsf, type, a, b, &c);
638 for (i = 0; (i < 4); i++)
640 tmp += a[i] * exp (-b[i] * k2);
648 extern real **gmx_structurefactors_table(gmx_structurefactors_t *gsf, real momentum, real ref_k, real lambda, int n_angles)
656 gmx_structurefactors *gsft = (gmx_structurefactors *)gsf;
658 NCMT = gsft->nratoms;
661 snew (sf_table, nsftable);
662 for (i = 0; (i < nsftable); i++)
664 snew (sf_table[i], n_angles);
665 for (j = 0; j < n_angles; j++)
667 q = ((double) j * ref_k);
668 /* theta is half the angle between incoming
669 and scattered wavevectors. */
670 sin_theta = q / (2.0 * momentum);
673 sf_table[i][j] = CMSF (gsf, i, 0, lambda, sin_theta);
677 sf_table[i][j] = CMSF (gsf, i, i-NCMT+1, lambda, sin_theta);
684 extern void gmx_structurefactors_done(gmx_structurefactors_t *gsf)
688 gmx_structurefactors *sf;
689 sf = (gmx_structurefactors *) gsf;
691 for (i = 0; i < sf->nratoms; i++)
695 sfree(sf->atomnm[i]);
708 extern real **compute_scattering_factor_table (gmx_structurefactors_t *gsf, structure_factor_t *sft)
711 * this function build up a table of scattering factors for every atom
712 * type and for every scattering angle.
715 double hc = 1239.842;
718 structure_factor *sf = (structure_factor *)sft;
721 /* \hbar \omega \lambda = hc = 1239.842 eV * nm */
722 sf->momentum = ((double) (2. * 1000.0 * M_PI * sf->energy) / hc);
723 sf->lambda = hc / (1000.0 * sf->energy);
724 fprintf (stderr, "\nwavelenght = %f nm\n", sf->lambda);
726 sf_table = gmx_structurefactors_table(gsf, sf->momentum, sf->ref_k, sf->lambda, sf->n_angles);