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59 #include "mtop_util.h"
61 #include "gmx_ga2la.h"
64 static void pull_print_x_grp(FILE *out,gmx_bool bRef,ivec dim,t_pullgrp *pgrp)
72 fprintf(out,"\t%g",bRef ? pgrp->x[m] : pgrp->dr[m]);
77 static void pull_print_x(FILE *out,t_pull *pull,double t)
81 fprintf(out, "%.4f", t);
85 for (g=1; g<1+pull->ngrp; g++)
87 pull_print_x_grp(out,TRUE ,pull->dim,&pull->dyna[g]);
88 pull_print_x_grp(out,FALSE,pull->dim,&pull->grp[g]);
93 for (g=0; g<1+pull->ngrp; g++)
95 if (pull->grp[g].nat > 0)
97 pull_print_x_grp(out,g==0,pull->dim,&pull->grp[g]);
104 static void pull_print_f(FILE *out,t_pull *pull,double t)
108 fprintf(out, "%.4f", t);
110 for(g=1; g<1+pull->ngrp; g++)
112 if (pull->eGeom == epullgPOS)
118 fprintf(out,"\t%g",pull->grp[g].f[d]);
124 fprintf(out,"\t%g",pull->grp[g].f_scal);
130 void pull_print_output(t_pull *pull, gmx_large_int_t step, double time)
132 if ((pull->nstxout != 0) && (step % pull->nstxout == 0))
134 pull_print_x(pull->out_x,pull,time);
137 if ((pull->nstfout != 0) && (step % pull->nstfout == 0))
139 pull_print_f(pull->out_f,pull,time);
143 static FILE *open_pull_out(const char *fn,t_pull *pull,const output_env_t oenv,
144 gmx_bool bCoord, unsigned long Flags)
148 char **setname,buf[10];
150 if(Flags & MD_APPENDFILES)
152 fp = gmx_fio_fopen(fn,"a+");
156 fp = gmx_fio_fopen(fn,"w+");
159 xvgr_header(fp,"Pull COM", "Time (ps)","Position (nm)",
164 xvgr_header(fp,"Pull force","Time (ps)","Force (kJ/mol/nm)",
168 snew(setname,(1+pull->ngrp)*DIM);
170 for(g=0; g<1+pull->ngrp; g++)
172 if (pull->grp[g].nat > 0 &&
173 (g > 0 || (bCoord && !PULL_CYL(pull))))
175 if (bCoord || pull->eGeom == epullgPOS)
183 sprintf(buf,"%d %s%c",g,"c",'X'+m);
184 setname[nsets] = strdup(buf);
193 sprintf(buf,"%d %s%c",
194 g,(bCoord && g > 0)?"d":"",'X'+m);
195 setname[nsets] = strdup(buf);
203 setname[nsets] = strdup(buf);
208 if (bCoord || nsets > 1)
210 xvgr_legend(fp,nsets,(const char**)setname,oenv);
212 for(g=0; g<nsets; g++)
222 /* Apply forces in a mass weighted fashion */
223 static void apply_forces_grp(t_pullgrp *pgrp, t_mdatoms * md,
225 dvec f_pull, int sign, rvec *f)
227 int i,ii,m,start,end;
231 end = md->homenr + start;
233 inv_wm = pgrp->wscale*pgrp->invtm;
235 for(i=0; i<pgrp->nat_loc; i++)
237 ii = pgrp->ind_loc[i];
238 wmass = md->massT[ii];
239 if (pgrp->weight_loc)
241 wmass *= pgrp->weight_loc[i];
246 f[ii][m] += sign * wmass * f_pull[m] * inv_wm;
251 /* Apply forces in a mass weighted fashion */
252 static void apply_forces(t_pull * pull, t_mdatoms * md, gmx_ga2la_t ga2la,
258 for(i=1; i<pull->ngrp+1; i++)
260 pgrp = &(pull->grp[i]);
261 apply_forces_grp(pgrp,md,ga2la,pgrp->f,1,f);
262 if (pull->grp[0].nat)
266 apply_forces_grp(&(pull->dyna[i]),md,ga2la,pgrp->f,-1,f);
270 apply_forces_grp(&(pull->grp[0]),md,ga2la,pgrp->f,-1,f);
276 static double max_pull_distance2(const t_pull *pull,const t_pbc *pbc)
281 max_d2 = GMX_DOUBLE_MAX;
283 if (pull->eGeom != epullgDIRPBC)
285 for(m=0; m<pbc->ndim_ePBC; m++)
287 if (pull->dim[m] != 0)
289 max_d2 = min(max_d2,norm2(pbc->box[m]));
297 static void get_pullgrps_dr(const t_pull *pull,const t_pbc *pbc,int g,double t,
298 dvec xg,dvec xref,double max_dist2,
301 t_pullgrp *pref,*pgrp;
303 dvec xrefr,dref={0,0,0};
306 pgrp = &pull->grp[g];
308 copy_dvec(xref,xrefr);
310 if (pull->eGeom == epullgDIRPBC)
314 dref[m] = (pgrp->init[0] + pgrp->rate*t)*pull->grp[g].vec[m];
316 /* Add the reference position, so we use the correct periodic image */
317 dvec_inc(xrefr,dref);
320 pbc_dx_d(pbc, xg, xrefr, dr);
324 dr[m] *= pull->dim[m];
327 if (max_dist2 >= 0 && dr2 > 0.98*0.98*max_dist2)
329 gmx_fatal(FARGS,"Distance of pull group %d (%f nm) is larger than 0.49 times the box size (%f)",g,sqrt(dr2),sqrt(max_dist2));
332 if (pull->eGeom == epullgDIRPBC)
338 static void get_pullgrp_dr(const t_pull *pull,const t_pbc *pbc,int g,double t,
343 if (pull->eGeom == epullgDIRPBC)
349 md2 = max_pull_distance2(pull,pbc);
352 get_pullgrps_dr(pull,pbc,g,t,
354 PULL_CYL(pull) ? pull->dyna[g].x : pull->grp[0].x,
359 void get_pullgrp_distance(t_pull *pull,t_pbc *pbc,int g,double t,
362 static gmx_bool bWarned=FALSE; /* TODO: this should be fixed for thread-safety,
363 but is fairly benign */
369 pgrp = &pull->grp[g];
371 get_pullgrp_dr(pull,pbc,g,t,dr);
373 if (pull->eGeom == epullgPOS)
377 ref[m] = pgrp->init[m] + pgrp->rate*t*pgrp->vec[m];
382 ref[0] = pgrp->init[0] + pgrp->rate*t;
388 /* Pull along the vector between the com's */
389 if (ref[0] < 0 && !bWarned)
391 fprintf(stderr,"\nPull reference distance for group %d is negative (%f)\n",g,ref[0]);
397 /* With no vector we can not determine the direction for the force,
398 * so we set the force to zero.
404 /* Determine the deviation */
405 dev[0] = drs - ref[0];
415 inpr += pgrp->vec[m]*dr[m];
417 dev[0] = inpr - ref[0];
420 /* Determine the difference of dr and ref along each dimension */
423 dev[m] = (dr[m] - ref[m])*pull->dim[m];
429 void clear_pull_forces(t_pull *pull)
433 /* Zeroing the forces is only required for constraint pulling.
434 * It can happen that multiple constraint steps need to be applied
435 * and therefore the constraint forces need to be accumulated.
437 for(i=0; i<1+pull->ngrp; i++)
439 clear_dvec(pull->grp[i].f);
440 pull->grp[i].f_scal = 0;
444 /* Apply constraint using SHAKE */
445 static void do_constraint(t_pull *pull, t_mdatoms *md, t_pbc *pbc,
447 gmx_bool bMaster, tensor vir,
451 dvec *r_ij; /* x[i] com of i in prev. step. Obeys constr. -> r_ij[i] */
452 dvec unc_ij; /* xp[i] com of i this step, before constr. -> unc_ij */
454 dvec *rinew; /* current 'new' position of group i */
455 dvec *rjnew; /* current 'new' position of group j */
458 double lambda, rm, mass, invdt=0;
459 gmx_bool bConverged_all,bConverged=FALSE;
460 int niter=0,g,ii,j,m,max_iter=100;
461 double q,a,b,c; /* for solving the quadratic equation,
462 see Num. Recipes in C ed 2 p. 184 */
463 dvec *dr; /* correction for group i */
464 dvec ref_dr; /* correction for group j */
465 dvec f; /* the pull force */
467 t_pullgrp *pdyna,*pgrp,*pref;
469 snew(r_ij,pull->ngrp+1);
472 snew(rjnew,pull->ngrp+1);
478 snew(dr,pull->ngrp+1);
479 snew(rinew,pull->ngrp+1);
481 /* copy the current unconstrained positions for use in iterations. We
482 iterate until rinew[i] and rjnew[j] obey the constraints. Then
483 rinew - pull.x_unc[i] is the correction dr to group i */
484 for(g=1; g<1+pull->ngrp; g++)
486 copy_dvec(pull->grp[g].xp,rinew[g]);
490 for(g=1; g<1+pull->ngrp; g++)
492 copy_dvec(pull->dyna[g].xp,rjnew[g]);
497 copy_dvec(pull->grp[0].xp,rjnew[0]);
500 /* Determine the constraint directions from the old positions */
501 for(g=1; g<1+pull->ngrp; g++)
503 get_pullgrp_dr(pull,pbc,g,t,r_ij[g]);
504 /* Store the difference vector at time t for printing */
505 copy_dvec(r_ij[g],pull->grp[g].dr);
508 fprintf(debug,"Pull group %d dr %f %f %f\n",
509 g,r_ij[g][XX],r_ij[g][YY],r_ij[g][ZZ]);
512 if (pull->eGeom == epullgDIR || pull->eGeom == epullgDIRPBC)
514 /* Select the component along vec */
518 a += pull->grp[g].vec[m]*r_ij[g][m];
522 r_ij[g][m] = a*pull->grp[g].vec[m];
527 bConverged_all = FALSE;
528 while (!bConverged_all && niter < max_iter)
530 bConverged_all = TRUE;
532 /* loop over all constraints */
533 for(g=1; g<1+pull->ngrp; g++)
535 pgrp = &pull->grp[g];
537 pref = &pull->dyna[g];
539 pref = &pull->grp[0];
541 /* Get the current difference vector */
542 get_pullgrps_dr(pull,pbc,g,t,rinew[g],rjnew[PULL_CYL(pull) ? g : 0],
545 if (pull->eGeom == epullgPOS)
549 ref[m] = pgrp->init[m] + pgrp->rate*t*pgrp->vec[m];
554 ref[0] = pgrp->init[0] + pgrp->rate*t;
555 /* Keep the compiler happy */
562 fprintf(debug,"Pull group %d, iteration %d\n",g,niter);
565 rm = 1.0/(pull->grp[g].invtm + pref->invtm);
572 gmx_fatal(FARGS,"The pull constraint reference distance for group %d is <= 0 (%f)",g,ref[0]);
575 a = diprod(r_ij[g],r_ij[g]);
576 b = diprod(unc_ij,r_ij[g])*2;
577 c = diprod(unc_ij,unc_ij) - dsqr(ref[0]);
581 q = -0.5*(b - sqrt(b*b - 4*a*c));
586 q = -0.5*(b + sqrt(b*b - 4*a*c));
593 "Pull ax^2+bx+c=0: a=%e b=%e c=%e lambda=%e\n",
597 /* The position corrections dr due to the constraints */
598 dsvmul(-lambda*rm*pgrp->invtm, r_ij[g], dr[g]);
599 dsvmul( lambda*rm*pref->invtm, r_ij[g], ref_dr);
604 /* A 1-dimensional constraint along a vector */
608 vec[m] = pgrp->vec[m];
609 a += unc_ij[m]*vec[m];
611 /* Select only the component along the vector */
612 dsvmul(a,vec,unc_ij);
616 fprintf(debug,"Pull inpr %e lambda: %e\n",a,lambda);
619 /* The position corrections dr due to the constraints */
620 dsvmul(-lambda*rm*pull->grp[g].invtm, vec, dr[g]);
621 dsvmul( lambda*rm* pref->invtm, vec,ref_dr);
628 lambda = r_ij[g][m] - ref[m];
629 /* The position corrections dr due to the constraints */
630 dr[g][m] = -lambda*rm*pull->grp[g].invtm;
631 ref_dr[m] = lambda*rm*pref->invtm;
645 j = (PULL_CYL(pull) ? g : 0);
646 get_pullgrps_dr(pull,pbc,g,t,rinew[g],rjnew[j],-1,tmp);
647 get_pullgrps_dr(pull,pbc,g,t,dr[g] ,ref_dr ,-1,tmp3);
649 "Pull cur %8.5f %8.5f %8.5f j:%8.5f %8.5f %8.5f d: %8.5f\n",
650 rinew[g][0],rinew[g][1],rinew[g][2],
651 rjnew[j][0],rjnew[j][1],rjnew[j][2], dnorm(tmp));
652 if (pull->eGeom == epullgPOS)
655 "Pull ref %8.5f %8.5f %8.5f\n",
656 pgrp->vec[0],pgrp->vec[1],pgrp->vec[2]);
661 "Pull ref %8s %8s %8s %8s %8s %8s d: %8.5f %8.5f %8.5f\n",
662 "","","","","","",ref[0],ref[1],ref[2]);
665 "Pull cor %8.5f %8.5f %8.5f j:%8.5f %8.5f %8.5f d: %8.5f\n",
666 dr[g][0],dr[g][1],dr[g][2],
667 ref_dr[0],ref_dr[1],ref_dr[2],
670 "Pull cor %10.7f %10.7f %10.7f\n",
671 dr[g][0],dr[g][1],dr[g][2]);
674 /* Update the COMs with dr */
675 dvec_inc(rinew[g], dr[g]);
676 dvec_inc(rjnew[PULL_CYL(pull) ? g : 0],ref_dr);
679 /* Check if all constraints are fullfilled now */
680 for(g=1; g<1+pull->ngrp; g++)
682 pgrp = &pull->grp[g];
684 get_pullgrps_dr(pull,pbc,g,t,rinew[g],rjnew[PULL_CYL(pull) ? g : 0],
690 bConverged = fabs(dnorm(unc_ij) - ref[0]) < pull->constr_tol;
697 vec[m] = pgrp->vec[m];
699 inpr = diprod(unc_ij,vec);
700 dsvmul(inpr,vec,unc_ij);
702 fabs(diprod(unc_ij,vec) - ref[0]) < pull->constr_tol;
709 fabs(unc_ij[m] - ref[m]) >= pull->constr_tol)
721 fprintf(debug,"NOT CONVERGED YET: Group %d:"
722 "d_ref = %f %f %f, current d = %f\n",
723 g,ref[0],ref[1],ref[2],dnorm(unc_ij));
726 bConverged_all = FALSE;
731 /* if after all constraints are dealt with and bConverged is still TRUE
732 we're finished, if not we do another iteration */
734 if (niter > max_iter)
736 gmx_fatal(FARGS,"Too many iterations for constraint run: %d",niter);
739 /* DONE ITERATING, NOW UPDATE COORDINATES AND CALC. CONSTRAINT FORCES */
746 /* update the normal groups */
747 for(g=1; g<1+pull->ngrp; g++)
749 pgrp = &pull->grp[g];
750 /* get the final dr and constraint force for group i */
751 dvec_sub(rinew[g],pgrp->xp,dr[g]);
752 /* select components of dr */
755 dr[g][m] *= pull->dim[m];
757 dsvmul(1.0/(pgrp->invtm*dt*dt),dr[g],f);
764 pgrp->f_scal += r_ij[g][m]*f[m]/dnorm(r_ij[g]);
772 pgrp->f_scal += pgrp->vec[m]*f[m];
779 if (vir && bMaster) {
780 /* Add the pull contribution to the virial */
785 vir[j][m] -= 0.5*f[j]*r_ij[g][m];
790 /* update the atom positions */
791 copy_dvec(dr[g],tmp);
792 for(j=0;j<pgrp->nat_loc;j++)
794 ii = pgrp->ind_loc[j];
795 if (pgrp->weight_loc)
797 dsvmul(pgrp->wscale*pgrp->weight_loc[j],dr[g],tmp);
807 v[ii][m] += invdt*tmp[m];
813 /* update the reference groups */
816 /* update the dynamic reference groups */
817 for(g=1; g<1+pull->ngrp; g++)
819 pdyna = &pull->dyna[g];
820 dvec_sub(rjnew[g],pdyna->xp,ref_dr);
821 /* select components of ref_dr */
824 ref_dr[m] *= pull->dim[m];
827 for(j=0;j<pdyna->nat_loc;j++)
829 /* reset the atoms with dr, weighted by w_i */
830 dsvmul(pdyna->wscale*pdyna->weight_loc[j],ref_dr,tmp);
831 ii = pdyna->ind_loc[j];
840 v[ii][m] += invdt*tmp[m];
848 pgrp = &pull->grp[0];
849 /* update the reference group */
850 dvec_sub(rjnew[0],pgrp->xp, ref_dr);
851 /* select components of ref_dr */
854 ref_dr[m] *= pull->dim[m];
857 copy_dvec(ref_dr,tmp);
858 for(j=0; j<pgrp->nat_loc;j++)
860 ii = pgrp->ind_loc[j];
861 if (pgrp->weight_loc)
863 dsvmul(pgrp->wscale*pgrp->weight_loc[j],ref_dr,tmp);
873 v[ii][m] += invdt*tmp[m];
879 /* finished! I hope. Give back some memory */
886 /* Pulling with a harmonic umbrella potential or constant force */
887 static void do_pull_pot(int ePull,
888 t_pull *pull, t_pbc *pbc, double t, real lambda,
889 real *V, tensor vir, real *dVdl)
897 /* loop over the groups that are being pulled */
900 for(g=1; g<1+pull->ngrp; g++)
902 pgrp = &pull->grp[g];
903 get_pullgrp_distance(pull,pbc,g,t,pgrp->dr,dev);
905 k = (1.0 - lambda)*pgrp->k + lambda*pgrp->kB;
906 dkdl = pgrp->kB - pgrp->k;
911 ndr = dnorm(pgrp->dr);
913 if (ePull == epullUMBRELLA)
915 pgrp->f_scal = -k*dev[0];
916 *V += 0.5* k*dsqr(dev[0]);
917 *dVdl += 0.5*dkdl*dsqr(dev[0]);
927 pgrp->f[m] = pgrp->f_scal*pgrp->dr[m]*invdr;
933 if (ePull == epullUMBRELLA)
935 pgrp->f_scal = -k*dev[0];
936 *V += 0.5* k*dsqr(dev[0]);
937 *dVdl += 0.5*dkdl*dsqr(dev[0]);
944 ndr += pgrp->vec[m]*pgrp->dr[m];
952 pgrp->f[m] = pgrp->f_scal*pgrp->vec[m];
958 if (ePull == epullUMBRELLA)
960 pgrp->f[m] = -k*dev[m];
961 *V += 0.5* k*dsqr(dev[m]);
962 *dVdl += 0.5*dkdl*dsqr(dev[m]);
966 pgrp->f[m] = -k*pull->dim[m];
967 *V += k*pgrp->dr[m]*pull->dim[m];
968 *dVdl += dkdl*pgrp->dr[m]*pull->dim[m];
976 /* Add the pull contribution to the virial */
981 vir[j][m] -= 0.5*pgrp->f[j]*pgrp->dr[m];
988 real pull_potential(int ePull,t_pull *pull, t_mdatoms *md, t_pbc *pbc,
989 t_commrec *cr, double t, real lambda,
990 rvec *x, rvec *f, tensor vir, real *dvdlambda)
994 pull_calc_coms(cr,pull,md,pbc,t,x,NULL);
996 do_pull_pot(ePull,pull,pbc,t,lambda,
997 &V,pull->bVirial && MASTER(cr) ? vir : NULL,&dVdl);
999 /* Distribute forces over pulled groups */
1000 apply_forces(pull, md, DOMAINDECOMP(cr) ? cr->dd->ga2la : NULL, f);
1006 return (MASTER(cr) ? V : 0.0);
1009 void pull_constraint(t_pull *pull, t_mdatoms *md, t_pbc *pbc,
1010 t_commrec *cr, double dt, double t,
1011 rvec *x, rvec *xp, rvec *v, tensor vir)
1013 pull_calc_coms(cr,pull,md,pbc,t,x,xp);
1015 do_constraint(pull,md,pbc,xp,v,pull->bVirial && MASTER(cr),vir,dt,t);
1018 static void make_local_pull_group(gmx_ga2la_t ga2la,
1019 t_pullgrp *pg,int start,int end)
1024 for(i=0; i<pg->nat; i++) {
1027 if (!ga2la_get_home(ga2la,ii,&ii)) {
1031 if (ii >= start && ii < end) {
1032 /* This is a home atom, add it to the local pull group */
1033 if (pg->nat_loc >= pg->nalloc_loc) {
1034 pg->nalloc_loc = over_alloc_dd(pg->nat_loc+1);
1035 srenew(pg->ind_loc,pg->nalloc_loc);
1036 if (pg->epgrppbc == epgrppbcCOS || pg->weight) {
1037 srenew(pg->weight_loc,pg->nalloc_loc);
1040 pg->ind_loc[pg->nat_loc] = ii;
1042 pg->weight_loc[pg->nat_loc] = pg->weight[i];
1049 void dd_make_local_pull_groups(gmx_domdec_t *dd,t_pull *pull,t_mdatoms *md)
1060 if (pull->grp[0].nat > 0)
1061 make_local_pull_group(ga2la,&pull->grp[0],md->start,md->start+md->homenr);
1062 for(g=1; g<1+pull->ngrp; g++)
1063 make_local_pull_group(ga2la,&pull->grp[g],md->start,md->start+md->homenr);
1066 static void init_pull_group_index(FILE *fplog,t_commrec *cr,
1068 int g,t_pullgrp *pg,ivec pulldims,
1069 gmx_mtop_t *mtop,t_inputrec *ir, real lambda)
1071 int i,ii,d,nfrozen,ndim;
1073 double tmass,wmass,wwmass;
1075 gmx_ga2la_t ga2la=NULL;
1076 gmx_groups_t *groups;
1077 gmx_mtop_atomlookup_t alook;
1080 bDomDec = (cr && DOMAINDECOMP(cr));
1082 ga2la = cr->dd->ga2la;
1085 if (EI_ENERGY_MINIMIZATION(ir->eI) || ir->eI == eiBD) {
1086 /* There are no masses in the integrator.
1087 * But we still want to have the correct mass-weighted COMs.
1088 * So we store the real masses in the weights.
1089 * We do not set nweight, so these weights do not end up in the tpx file.
1091 if (pg->nweight == 0) {
1092 snew(pg->weight,pg->nat);
1096 if (cr && PAR(cr)) {
1100 pg->weight_loc = NULL;
1102 pg->nat_loc = pg->nat;
1103 pg->ind_loc = pg->ind;
1104 if (pg->epgrppbc == epgrppbcCOS) {
1105 snew(pg->weight_loc,pg->nat);
1107 pg->weight_loc = pg->weight;
1111 groups = &mtop->groups;
1113 alook = gmx_mtop_atomlookup_init(mtop);
1119 for(i=0; i<pg->nat; i++) {
1121 gmx_mtop_atomnr_to_atom(alook,ii,&atom);
1122 if (cr && PAR(cr) && !bDomDec && ii >= start && ii < end)
1123 pg->ind_loc[pg->nat_loc++] = ii;
1124 if (ir->opts.nFreeze) {
1125 for(d=0; d<DIM; d++)
1126 if (pulldims[d] && ir->opts.nFreeze[ggrpnr(groups,egcFREEZE,ii)][d])
1129 if (ir->efep == efepNO) {
1132 m = (1 - lambda)*atom->m + lambda*atom->mB;
1134 if (pg->nweight > 0) {
1139 if (EI_ENERGY_MINIMIZATION(ir->eI)) {
1140 /* Move the mass to the weight */
1144 } else if (ir->eI == eiBD) {
1146 mbd = ir->bd_fric*ir->delta_t;
1148 if (groups->grpnr[egcTC] == NULL) {
1149 mbd = ir->delta_t/ir->opts.tau_t[0];
1151 mbd = ir->delta_t/ir->opts.tau_t[groups->grpnr[egcTC][ii]];
1163 gmx_mtop_atomlookup_destroy(alook);
1166 gmx_fatal(FARGS,"The total%s mass of pull group %d is zero",
1167 pg->weight ? " weighted" : "",g);
1171 "Pull group %d: %5d atoms, mass %9.3f",g,pg->nat,tmass);
1172 if (pg->weight || EI_ENERGY_MINIMIZATION(ir->eI) || ir->eI == eiBD) {
1173 fprintf(fplog,", weighted mass %9.3f",wmass*wmass/wwmass);
1175 if (pg->epgrppbc == epgrppbcCOS) {
1176 fprintf(fplog,", cosine weighting will be used");
1178 fprintf(fplog,"\n");
1182 /* A value > 0 signals not frozen, it is updated later */
1186 for(d=0; d<DIM; d++)
1187 ndim += pulldims[d]*pg->nat;
1188 if (fplog && nfrozen > 0 && nfrozen < ndim) {
1190 "\nWARNING: In pull group %d some, but not all of the degrees of freedom\n"
1191 " that are subject to pulling are frozen.\n"
1192 " For pulling the whole group will be frozen.\n\n",
1200 void init_pull(FILE *fplog,t_inputrec *ir,int nfile,const t_filenm fnm[],
1201 gmx_mtop_t *mtop,t_commrec *cr,const output_env_t oenv, real lambda,
1202 gmx_bool bOutFile, unsigned long Flags)
1206 int g,start=0,end=0,m;
1211 pull->ePBC = ir->ePBC;
1214 case epbcNONE: pull->npbcdim = 0; break;
1215 case epbcXY: pull->npbcdim = 2; break;
1216 default: pull->npbcdim = 3; break;
1221 fprintf(fplog,"\nWill apply %s COM pulling in geometry '%s'\n",
1222 EPULLTYPE(ir->ePull),EPULLGEOM(pull->eGeom));
1223 if (pull->grp[0].nat > 0)
1225 fprintf(fplog,"between a reference group and %d group%s\n",
1226 pull->ngrp,pull->ngrp==1 ? "" : "s");
1230 fprintf(fplog,"with an absolute reference on %d group%s\n",
1231 pull->ngrp,pull->ngrp==1 ? "" : "s");
1234 for(g=0; g<pull->ngrp+1; g++)
1236 if (pull->grp[g].nat > 1 &&
1237 pull->grp[g].pbcatom < 0)
1239 /* We are using cosine weighting */
1240 fprintf(fplog,"Cosine weighting is used for group %d\n",g);
1246 please_cite(fplog,"Engin2010");
1250 /* We always add the virial contribution,
1251 * except for geometry = direction_periodic where this is impossible.
1253 pull->bVirial = (pull->eGeom != epullgDIRPBC);
1254 if (getenv("GMX_NO_PULLVIR") != NULL)
1258 fprintf(fplog,"Found env. var., will not add the virial contribution of the COM pull forces\n");
1260 pull->bVirial = FALSE;
1263 if (cr && PARTDECOMP(cr))
1265 pd_at_range(cr,&start,&end);
1269 pull->dbuf_cyl=NULL;
1270 pull->bRefAt = FALSE;
1272 for(g=0; g<pull->ngrp+1; g++)
1274 pgrp = &pull->grp[g];
1275 pgrp->epgrppbc = epgrppbcNONE;
1278 /* Determine if we need to take PBC into account for calculating
1279 * the COM's of the pull groups.
1281 for(m=0; m<pull->npbcdim; m++)
1283 if (pull->dim[m] && pgrp->nat > 1)
1285 if (pgrp->pbcatom >= 0)
1287 pgrp->epgrppbc = epgrppbcREFAT;
1288 pull->bRefAt = TRUE;
1294 gmx_fatal(FARGS,"Pull groups can not have relative weights and cosine weighting at same time");
1296 pgrp->epgrppbc = epgrppbcCOS;
1297 if (pull->cosdim >= 0 && pull->cosdim != m)
1299 gmx_fatal(FARGS,"Can only use cosine weighting with pulling in one dimension (use mdp option pull_dim)");
1305 /* Set the indices */
1306 init_pull_group_index(fplog,cr,start,end,g,pgrp,pull->dim,mtop,ir,lambda);
1307 if (PULL_CYL(pull) && pgrp->invtm == 0)
1309 gmx_fatal(FARGS,"Can not have frozen atoms in a cylinder pull group");
1314 /* Absolute reference, set the inverse mass to zero */
1320 /* if we use dynamic reference groups, do some initialising for them */
1323 if (pull->grp[0].nat == 0)
1325 gmx_fatal(FARGS, "Dynamic reference groups are not supported when using absolute reference!\n");
1327 snew(pull->dyna,pull->ngrp+1);
1330 /* Only do I/O when we are doing dynamics and if we are the MASTER */
1335 if (pull->nstxout > 0)
1337 pull->out_x = open_pull_out(opt2fn("-px",nfile,fnm),pull,oenv,TRUE,Flags);
1339 if (pull->nstfout > 0)
1341 pull->out_f = open_pull_out(opt2fn("-pf",nfile,fnm),pull,oenv,
1347 void finish_pull(FILE *fplog,t_pull *pull)
1351 gmx_fio_fclose(pull->out_x);
1355 gmx_fio_fclose(pull->out_f);