Add conserved quantity for Berendsen P-couple

[gromacs.git] / src / gromacs / tools / check.cpp

/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
 * Copyright (c) 2001-2013, The GROMACS development team.
 * Copyright (c) 2013,2014,2015,2016,2017, by the GROMACS development team, led by
 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
 * and including many others, as listed in the AUTHORS file in the
 * top-level source directory and at http://www.gromacs.org.
 *
 * GROMACS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
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 */
#include "gmxpre.h"

#include <cmath>
#include <cstdio>
#include <cstring>

#include "gromacs/commandline/pargs.h"
#include "gromacs/fileio/confio.h"
#include "gromacs/fileio/enxio.h"
#include "gromacs/fileio/gmxfio.h"
#include "gromacs/fileio/tpxio.h"
#include "gromacs/fileio/trxio.h"
#include "gromacs/fileio/xtcio.h"
#include "gromacs/math/functions.h"
#include "gromacs/math/units.h"
#include "gromacs/math/vec.h"
#include "gromacs/mdrunutility/mdmodules.h"
#include "gromacs/mdtypes/inputrec.h"
#include "gromacs/mdtypes/md_enums.h"
#include "gromacs/mdtypes/state.h"
#include "gromacs/pbcutil/pbc.h"
#include "gromacs/topology/atomprop.h"
#include "gromacs/topology/block.h"
#include "gromacs/topology/ifunc.h"
#include "gromacs/topology/index.h"
#include "gromacs/topology/mtop_util.h"
#include "gromacs/topology/topology.h"
#include "gromacs/trajectory/trajectoryframe.h"
#include "gromacs/utility/arraysize.h"
#include "gromacs/utility/fatalerror.h"
#include "gromacs/utility/futil.h"
#include "gromacs/utility/smalloc.h"

typedef struct {
    int bStep;
    int bTime;
    int bLambda;
    int bX;
    int bV;
    int bF;
    int bBox;
} t_count;

typedef struct {
    float bStep;
    float bTime;
    float bLambda;
    float bX;
    float bV;
    float bF;
    float bBox;
} t_fr_time;

static void comp_tpx(const char *fn1, const char *fn2,
                     gmx_bool bRMSD, real ftol, real abstol)
{
    const char    *ff[2];
    t_inputrec    *ir[2];
    t_state        state[2];
    gmx_mtop_t     mtop[2];
    t_topology     top[2];
    int            i;

    ff[0] = fn1;
    ff[1] = fn2;
    for (i = 0; i < (fn2 ? 2 : 1); i++)
    {
        ir[i] = new t_inputrec();
        read_tpx_state(ff[i], ir[i], &state[i], &(mtop[i]));
        gmx::MDModules().adjustInputrecBasedOnModules(ir[i]);
    }
    if (fn2)
    {
        cmp_inputrec(stdout, ir[0], ir[1], ftol, abstol);
        /* Convert gmx_mtop_t to t_topology.
         * We should implement direct mtop comparison,
         * but it might be useful to keep t_topology comparison as an option.
         */
        top[0] = gmx_mtop_t_to_t_topology(&mtop[0], false);
        top[1] = gmx_mtop_t_to_t_topology(&mtop[1], false);
        cmp_top(stdout, &top[0], &top[1], ftol, abstol);
        cmp_groups(stdout, &mtop[0].groups, &mtop[1].groups,
                   mtop[0].natoms, mtop[1].natoms);
        comp_state(&state[0], &state[1], bRMSD, ftol, abstol);
    }
    else
    {
        if (ir[0]->efep == efepNO)
        {
            fprintf(stdout, "inputrec->efep = %s\n", efep_names[ir[0]->efep]);
        }
        else
        {
            if (ir[0]->bPull)
            {
                comp_pull_AB(stdout, ir[0]->pull, ftol, abstol);
            }
            /* Convert gmx_mtop_t to t_topology.
             * We should implement direct mtop comparison,
             * but it might be useful to keep t_topology comparison as an option.
             */
            top[0] = gmx_mtop_t_to_t_topology(&mtop[0], true);
            cmp_top(stdout, &top[0], nullptr, ftol, abstol);
        }
    }
}

static void comp_trx(const gmx_output_env_t *oenv, const char *fn1, const char *fn2,
                     gmx_bool bRMSD, real ftol, real abstol)
{
    int          i;
    const char  *fn[2];
    t_trxframe   fr[2];
    t_trxstatus *status[2];
    gmx_bool     b[2];

    fn[0] = fn1;
    fn[1] = fn2;
    fprintf(stderr, "Comparing trajectory files %s and %s\n", fn1, fn2);
    for (i = 0; i < 2; i++)
    {
        b[i] = read_first_frame(oenv, &status[i], fn[i], &fr[i], TRX_READ_X|TRX_READ_V|TRX_READ_F);
    }

    if (b[0] && b[1])
    {
        do
        {
            comp_frame(stdout, &(fr[0]), &(fr[1]), bRMSD, ftol, abstol);

            for (i = 0; i < 2; i++)
            {
                b[i] = read_next_frame(oenv, status[i], &fr[i]);
            }
        }
        while (b[0] && b[1]);

        for (i = 0; i < 2; i++)
        {
            if (b[i] && !b[1-i])
            {
                fprintf(stdout, "\nEnd of file on %s but not on %s\n", fn[1-i], fn[i]);
            }
            close_trx(status[i]);
        }
    }
    if (!b[0] && !b[1])
    {
        fprintf(stdout, "\nBoth files read correctly\n");
    }
}

static void tpx2system(FILE *fp, const gmx_mtop_t *mtop)
{
    int                       nmol, nvsite = 0;
    gmx_mtop_atomloop_block_t aloop;
    const t_atom             *atom;

    fprintf(fp, "\\subsection{Simulation system}\n");
    aloop = gmx_mtop_atomloop_block_init(mtop);
    while (gmx_mtop_atomloop_block_next(aloop, &atom, &nmol))
    {
        if (atom->ptype == eptVSite)
        {
            nvsite += nmol;
        }
    }
    fprintf(fp, "A system of %d molecules (%d atoms) was simulated.\n",
            mtop->mols.nr, mtop->natoms-nvsite);
    if (nvsite)
    {
        fprintf(fp, "Virtual sites were used in some of the molecules.\n");
    }
    fprintf(fp, "\n\n");
}

static void tpx2params(FILE *fp, const t_inputrec *ir)
{
    fprintf(fp, "\\subsection{Simulation settings}\n");
    fprintf(fp, "A total of %g ns were simulated with a time step of %g fs.\n",
            ir->nsteps*ir->delta_t*0.001, 1000*ir->delta_t);
    fprintf(fp, "Neighbor searching was performed every %d steps.\n", ir->nstlist);
    fprintf(fp, "The %s algorithm was used for electrostatic interactions.\n",
            EELTYPE(ir->coulombtype));
    fprintf(fp, "with a cut-off of %g nm.\n", ir->rcoulomb);
    if (ir->coulombtype == eelPME)
    {
        fprintf(fp, "A reciprocal grid of %d x %d x %d cells was used with %dth order B-spline interpolation.\n", ir->nkx, ir->nky, ir->nkz, ir->pme_order);
    }
    if (ir->rvdw > ir->rlist)
    {
        fprintf(fp, "A twin-range Van der Waals cut-off (%g/%g nm) was used, where the long range forces were updated during neighborsearching.\n", ir->rlist, ir->rvdw);
    }
    else
    {
        fprintf(fp, "A single cut-off of %g was used for Van der Waals interactions.\n", ir->rlist);
    }
    if (ir->etc != 0)
    {
        fprintf(fp, "Temperature coupling was done with the %s algorithm.\n",
                etcoupl_names[ir->etc]);
    }
    if (ir->epc != 0)
    {
        fprintf(fp, "Pressure coupling was done with the %s algorithm.\n",
                epcoupl_names[ir->epc]);
    }
    fprintf(fp, "\n\n");
}

static void tpx2methods(const char *tpx, const char *tex)
{
    FILE          *fp;
    t_state        state;
    gmx_mtop_t     mtop;

    t_inputrec     ir;
    read_tpx_state(tpx, &ir, &state, &mtop);
    fp = gmx_fio_fopen(tex, "w");
    fprintf(fp, "\\section{Methods}\n");
    tpx2system(fp, &mtop);
    tpx2params(fp, &ir);
    gmx_fio_fclose(fp);
}

static void chk_coords(int frame, int natoms, rvec *x, matrix box, real fac, real tol)
{
    int  i, j;
    int  nNul = 0;
    real vol  = det(box);

    for (i = 0; (i < natoms); i++)
    {
        for (j = 0; (j < DIM); j++)
        {
            if ((vol > 0) && (fabs(x[i][j]) > fac*box[j][j]))
            {
                printf("Warning at frame %d: coordinates for atom %d are large (%g)\n",
                       frame, i, x[i][j]);
            }
        }
        if ((fabs(x[i][XX]) < tol) &&
            (fabs(x[i][YY]) < tol) &&
            (fabs(x[i][ZZ]) < tol))
        {
            nNul++;
        }
    }
    if (nNul > 0)
    {
        printf("Warning at frame %d: there are %d particles with all coordinates zero\n",
               frame, nNul);
    }
}

static void chk_vels(int frame, int natoms, rvec *v)
{
    int i, j;

    for (i = 0; (i < natoms); i++)
    {
        for (j = 0; (j < DIM); j++)
        {
            if (fabs(v[i][j]) > 500)
            {
                printf("Warning at frame %d. Velocities for atom %d are large (%g)\n",
                       frame, i, v[i][j]);
            }
        }
    }
}

static void chk_forces(int frame, int natoms, rvec *f)
{
    int i, j;

    for (i = 0; (i < natoms); i++)
    {
        for (j = 0; (j < DIM); j++)
        {
            if (fabs(f[i][j]) > 10000)
            {
                printf("Warning at frame %d. Forces for atom %d are large (%g)\n",
                       frame, i, f[i][j]);
            }
        }
    }
}

static void chk_bonds(t_idef *idef, int ePBC, rvec *x, matrix box, real tol)
{
    int   ftype, k, ai, aj, type;
    real  b0, blen, deviation;
    t_pbc pbc;
    rvec  dx;

    set_pbc(&pbc, ePBC, box);
    for (ftype = 0; (ftype < F_NRE); ftype++)
    {
        if ((interaction_function[ftype].flags & IF_CHEMBOND) == IF_CHEMBOND)
        {
            for (k = 0; (k < idef->il[ftype].nr); )
            {
                type = idef->il[ftype].iatoms[k++];
                ai   = idef->il[ftype].iatoms[k++];
                aj   = idef->il[ftype].iatoms[k++];
                b0   = 0;
                switch (ftype)
                {
                    case F_BONDS:
                        b0 = idef->iparams[type].harmonic.rA;
                        break;
                    case F_G96BONDS:
                        b0 = std::sqrt(idef->iparams[type].harmonic.rA);
                        break;
                    case F_MORSE:
                        b0 = idef->iparams[type].morse.b0A;
                        break;
                    case F_CUBICBONDS:
                        b0 = idef->iparams[type].cubic.b0;
                        break;
                    case F_CONSTR:
                        b0 = idef->iparams[type].constr.dA;
                        break;
                    default:
                        break;
                }
                if (b0 != 0)
                {
                    pbc_dx(&pbc, x[ai], x[aj], dx);
                    blen      = norm(dx);
                    deviation = gmx::square(blen-b0);
                    if (std::sqrt(deviation/gmx::square(b0)) > tol)
                    {
                        fprintf(stderr, "Distance between atoms %d and %d is %.3f, should be %.3f\n", ai+1, aj+1, blen, b0);
                    }
                }
            }
        }
    }
}

void chk_trj(const gmx_output_env_t *oenv, const char *fn, const char *tpr, real tol)
{
    t_trxframe       fr;
    t_count          count;
    t_fr_time        first, last;
    int              j = -1, new_natoms, natoms;
    real             old_t1, old_t2;
    gmx_bool         bShowTimestep = TRUE, newline = FALSE;
    t_trxstatus     *status;
    gmx_mtop_t       mtop;
    gmx_localtop_t  *top = nullptr;
    t_state          state;
    t_inputrec       ir;

    if (tpr)
    {
        read_tpx_state(tpr, &ir, &state, &mtop);
        top = gmx_mtop_generate_local_top(&mtop, ir.efep != efepNO);
    }
    new_natoms = -1;
    natoms     = -1;

    printf("Checking file %s\n", fn);

    j      =  0;
    old_t2 = -2.0;
    old_t1 = -1.0;

    count.bStep   = 0;
    count.bTime   = 0;
    count.bLambda = 0;
    count.bX      = 0;
    count.bV      = 0;
    count.bF      = 0;
    count.bBox    = 0;

    first.bStep   = 0;
    first.bTime   = 0;
    first.bLambda = 0;
    first.bX      = 0;
    first.bV      = 0;
    first.bF      = 0;
    first.bBox    = 0;

    last.bStep   = 0;
    last.bTime   = 0;
    last.bLambda = 0;
    last.bX      = 0;
    last.bV      = 0;
    last.bF      = 0;
    last.bBox    = 0;

    read_first_frame(oenv, &status, fn, &fr, TRX_READ_X | TRX_READ_V | TRX_READ_F);

    do
    {
        if (j == 0)
        {
            fprintf(stderr, "\n# Atoms  %d\n", fr.natoms);
            if (fr.bPrec)
            {
                fprintf(stderr, "Precision %g (nm)\n", 1/fr.prec);
            }
        }
        newline = TRUE;
        if ((natoms > 0) && (new_natoms != natoms))
        {
            fprintf(stderr, "\nNumber of atoms at t=%g don't match (%d, %d)\n",
                    old_t1, natoms, new_natoms);
            newline = FALSE;
        }
        if (j >= 2)
        {
            if (fabs((fr.time-old_t1)-(old_t1-old_t2)) >
                0.1*(fabs(fr.time-old_t1)+fabs(old_t1-old_t2)) )
            {
                bShowTimestep = FALSE;
                fprintf(stderr, "%sTimesteps at t=%g don't match (%g, %g)\n",
                        newline ? "\n" : "", old_t1, old_t1-old_t2, fr.time-old_t1);
            }
        }
        natoms = new_natoms;
        if (tpr)
        {
            chk_bonds(&top->idef, ir.ePBC, fr.x, fr.box, tol);
        }
        if (fr.bX)
        {
            chk_coords(j, natoms, fr.x, fr.box, 1e5, tol);
        }
        if (fr.bV)
        {
            chk_vels(j, natoms, fr.v);
        }
        if (fr.bF)
        {
            chk_forces(j, natoms, fr.f);
        }

        old_t2 = old_t1;
        old_t1 = fr.time;
        j++;
        new_natoms = fr.natoms;
#define INC(s, n, f, l, item) if (s.item != 0) { if (n.item == 0) { first.item = fr.time; } last.item = fr.time; n.item++; \
}
        INC(fr, count, first, last, bStep);
        INC(fr, count, first, last, bTime);
        INC(fr, count, first, last, bLambda);
        INC(fr, count, first, last, bX);
        INC(fr, count, first, last, bV);
        INC(fr, count, first, last, bF);
        INC(fr, count, first, last, bBox);
#undef INC
    }
    while (read_next_frame(oenv, status, &fr));

    fprintf(stderr, "\n");

    close_trx(status);

    fprintf(stderr, "\nItem        #frames");
    if (bShowTimestep)
    {
        fprintf(stderr, " Timestep (ps)");
    }
    fprintf(stderr, "\n");
#define PRINTITEM(label, item) fprintf(stderr, "%-10s  %6d", label, count.item); if ((bShowTimestep) && (count.item > 1)) {fprintf(stderr, "    %g\n", (last.item-first.item)/(count.item-1)); }else fprintf(stderr, "\n")
    PRINTITEM ( "Step",       bStep );
    PRINTITEM ( "Time",       bTime );
    PRINTITEM ( "Lambda",     bLambda );
    PRINTITEM ( "Coords",     bX );
    PRINTITEM ( "Velocities", bV );
    PRINTITEM ( "Forces",     bF );
    PRINTITEM ( "Box",        bBox );
}

void chk_tps(const char *fn, real vdw_fac, real bon_lo, real bon_hi)
{
    int            natom, i, j, k;
    t_topology     top;
    int            ePBC;
    t_atoms       *atoms;
    rvec          *x, *v;
    rvec           dx;
    matrix         box;
    t_pbc          pbc;
    gmx_bool       bV, bX, bB, bFirst, bOut;
    real           r2, ekin, temp1, temp2, dist2, vdwfac2, bonlo2, bonhi2;
    real          *atom_vdw;
    gmx_atomprop_t aps;

    fprintf(stderr, "Checking coordinate file %s\n", fn);
    read_tps_conf(fn, &top, &ePBC, &x, &v, box, TRUE);
    atoms = &top.atoms;
    natom = atoms->nr;
    fprintf(stderr, "%d atoms in file\n", atoms->nr);

    /* check coordinates and box */
    bV = FALSE;
    bX = FALSE;
    for (i = 0; (i < natom) && !(bV && bX); i++)
    {
        for (j = 0; (j < DIM) && !(bV && bX); j++)
        {
            bV = bV || (v[i][j] != 0);
            bX = bX || (x[i][j] != 0);
        }
    }
    bB = FALSE;
    for (i = 0; (i < DIM) && !bB; i++)
    {
        for (j = 0; (j < DIM) && !bB; j++)
        {
            bB = bB || (box[i][j] != 0);
        }
    }

    fprintf(stderr, "coordinates %s\n", bX ? "found" : "absent");
    fprintf(stderr, "box         %s\n", bB ? "found" : "absent");
    fprintf(stderr, "velocities  %s\n", bV ? "found" : "absent");
    fprintf(stderr, "\n");

    /* check velocities */
    if (bV)
    {
        ekin = 0.0;
        for (i = 0; (i < natom); i++)
        {
            for (j = 0; (j < DIM); j++)
            {
                ekin += 0.5*atoms->atom[i].m*v[i][j]*v[i][j];
            }
        }
        temp1 = (2.0*ekin)/(natom*DIM*BOLTZ);
        temp2 = (2.0*ekin)/(natom*(DIM-1)*BOLTZ);
        fprintf(stderr, "Kinetic energy: %g (kJ/mol)\n", ekin);
        fprintf(stderr, "Assuming the number of degrees of freedom to be "
                "Natoms * %d or Natoms * %d,\n"
                "the velocities correspond to a temperature of the system\n"
                "of %g K or %g K respectively.\n\n", DIM, DIM-1, temp1, temp2);
    }

    /* check coordinates */
    if (bX)
    {
        vdwfac2 = gmx::square(vdw_fac);
        bonlo2  = gmx::square(bon_lo);
        bonhi2  = gmx::square(bon_hi);

        fprintf(stderr,
                "Checking for atoms closer than %g and not between %g and %g,\n"
                "relative to sum of Van der Waals distance:\n",
                vdw_fac, bon_lo, bon_hi);
        snew(atom_vdw, natom);
        aps = gmx_atomprop_init();
        for (i = 0; (i < natom); i++)
        {
            gmx_atomprop_query(aps, epropVDW,
                               *(atoms->resinfo[atoms->atom[i].resind].name),
                               *(atoms->atomname[i]), &(atom_vdw[i]));
            if (debug)
            {
                fprintf(debug, "%5d %4s %4s %7g\n", i+1,
                        *(atoms->resinfo[atoms->atom[i].resind].name),
                        *(atoms->atomname[i]),
                        atom_vdw[i]);
            }
        }
        gmx_atomprop_destroy(aps);
        if (bB)
        {
            set_pbc(&pbc, ePBC, box);
        }

        bFirst = TRUE;
        for (i = 0; (i < natom); i++)
        {
            if (((i+1)%10) == 0)
            {
                fprintf(stderr, "\r%5d", i+1);
                fflush(stderr);
            }
            for (j = i+1; (j < natom); j++)
            {
                if (bB)
                {
                    pbc_dx(&pbc, x[i], x[j], dx);
                }
                else
                {
                    rvec_sub(x[i], x[j], dx);
                }
                r2    = iprod(dx, dx);
                dist2 = gmx::square(atom_vdw[i]+atom_vdw[j]);
                if ( (r2 <= dist2*bonlo2) ||
                     ( (r2 >= dist2*bonhi2) && (r2 <= dist2*vdwfac2) ) )
                {
                    if (bFirst)
                    {
                        fprintf(stderr, "\r%5s %4s %8s %5s  %5s %4s %8s %5s  %6s\n",
                                "atom#", "name", "residue", "r_vdw",
                                "atom#", "name", "residue", "r_vdw", "distance");
                        bFirst = FALSE;
                    }
                    fprintf(stderr,
                            "\r%5d %4s %4s%4d %-5.3g  %5d %4s %4s%4d %-5.3g  %-6.4g\n",
                            i+1, *(atoms->atomname[i]),
                            *(atoms->resinfo[atoms->atom[i].resind].name),
                            atoms->resinfo[atoms->atom[i].resind].nr,
                            atom_vdw[i],
                            j+1, *(atoms->atomname[j]),
                            *(atoms->resinfo[atoms->atom[j].resind].name),
                            atoms->resinfo[atoms->atom[j].resind].nr,
                            atom_vdw[j],
                            std::sqrt(r2) );
                }
            }
        }
        if (bFirst)
        {
            fprintf(stderr, "\rno close atoms found\n");
        }
        fprintf(stderr, "\r      \n");

        if (bB)
        {
            /* check box */
            bFirst = TRUE;
            k      = 0;
            for (i = 0; (i < natom) && (k < 10); i++)
            {
                bOut = FALSE;
                for (j = 0; (j < DIM) && !bOut; j++)
                {
                    bOut = bOut || (x[i][j] < 0) || (x[i][j] > box[j][j]);
                }
                if (bOut)
                {
                    k++;
                    if (bFirst)
                    {
                        fprintf(stderr, "Atoms outside box ( ");
                        for (j = 0; (j < DIM); j++)
                        {
                            fprintf(stderr, "%g ", box[j][j]);
                        }
                        fprintf(stderr, "):\n"
                                "(These may occur often and are normally not a problem)\n"
                                "%5s %4s %8s %5s  %s\n",
                                "atom#", "name", "residue", "r_vdw", "coordinate");
                        bFirst = FALSE;
                    }
                    fprintf(stderr,
                            "%5d %4s %4s%4d %-5.3g",
                            i, *(atoms->atomname[i]),
                            *(atoms->resinfo[atoms->atom[i].resind].name),
                            atoms->resinfo[atoms->atom[i].resind].nr, atom_vdw[i]);
                    for (j = 0; (j < DIM); j++)
                    {
                        fprintf(stderr, " %6.3g", x[i][j]);
                    }
                    fprintf(stderr, "\n");
                }
            }
            if (k == 10)
            {
                fprintf(stderr, "(maybe more)\n");
            }
            if (bFirst)
            {
                fprintf(stderr, "no atoms found outside box\n");
            }
            fprintf(stderr, "\n");
        }
    }
}

void chk_ndx(const char *fn)
{
    t_blocka *grps;
    char    **grpname;
    int       i;

    grps = init_index(fn, &grpname);
    if (debug)
    {
        pr_blocka(debug, 0, fn, grps, FALSE);
    }
    else
    {
        printf("Contents of index file %s\n", fn);
        printf("--------------------------------------------------\n");
        printf("Nr.   Group               #Entries   First    Last\n");
        for (i = 0; (i < grps->nr); i++)
        {
            printf("%4d  %-20s%8d%8d%8d\n", i, grpname[i],
                   grps->index[i+1]-grps->index[i],
                   grps->a[grps->index[i]]+1,
                   grps->a[grps->index[i+1]-1]+1);
        }
    }
    for (i = 0; (i < grps->nr); i++)
    {
        sfree(grpname[i]);
    }
    sfree(grpname);
    done_blocka(grps);
}

void chk_enx(const char *fn)
{
    int            nre, fnr;
    ener_file_t    in;
    gmx_enxnm_t   *enm = nullptr;
    t_enxframe    *fr;
    gmx_bool       bShowTStep;
    gmx_bool       timeSet;
    real           t0, old_t1, old_t2;
    char           buf[22];

    fprintf(stderr, "Checking energy file %s\n\n", fn);

    in = open_enx(fn, "r");
    do_enxnms(in, &nre, &enm);
    fprintf(stderr, "%d groups in energy file", nre);
    snew(fr, 1);
    old_t2     = -2.0;
    old_t1     = -1.0;
    fnr        = 0;
    t0         = 0;
    timeSet    = FALSE;
    bShowTStep = TRUE;

    while (do_enx(in, fr))
    {
        if (fnr >= 2)
        {
            if (fabs((fr->t-old_t1)-(old_t1-old_t2)) >
                0.1*(fabs(fr->t-old_t1)+fabs(old_t1-old_t2)) )
            {
                bShowTStep = FALSE;
                fprintf(stderr, "\nTimesteps at t=%g don't match (%g, %g)\n",
                        old_t1, old_t1-old_t2, fr->t-old_t1);
            }
        }
        old_t2 = old_t1;
        old_t1 = fr->t;
        if (!timeSet)
        {
            t0      = fr->t;
            timeSet = TRUE;
        }
        if (fnr == 0)
        {
            fprintf(stderr, "\rframe: %6s (index %6d), t: %10.3f\n",
                    gmx_step_str(fr->step, buf), fnr, fr->t);
        }
        fnr++;
    }
    fprintf(stderr, "\n\nFound %d frames", fnr);
    if (bShowTStep && fnr > 1)
    {
        fprintf(stderr, " with a timestep of %g ps", (old_t1-t0)/(fnr-1));
    }
    fprintf(stderr, ".\n");

    free_enxframe(fr);
    free_enxnms(nre, enm);
    sfree(fr);
}

int gmx_check(int argc, char *argv[])
{
    const char       *desc[] = {
        "[THISMODULE] reads a trajectory ([REF].tng[ref], [REF].trr[ref] or ",
        "[REF].xtc[ref]), an energy file ([REF].edr[ref])",
        "or an index file ([REF].ndx[ref])",
        "and prints out useful information about them.[PAR]",
        "Option [TT]-c[tt] checks for presence of coordinates,",
        "velocities and box in the file, for close contacts (smaller than",
        "[TT]-vdwfac[tt] and not bonded, i.e. not between [TT]-bonlo[tt]",
        "and [TT]-bonhi[tt], all relative to the sum of both Van der Waals",
        "radii) and atoms outside the box (these may occur often and are",
        "no problem). If velocities are present, an estimated temperature",
        "will be calculated from them.[PAR]",
        "If an index file, is given its contents will be summarized.[PAR]",
        "If both a trajectory and a [REF].tpr[ref] file are given (with [TT]-s1[tt])",
        "the program will check whether the bond lengths defined in the tpr",
        "file are indeed correct in the trajectory. If not you may have",
        "non-matching files due to e.g. deshuffling or due to problems with",
        "virtual sites. With these flags, [TT]gmx check[tt] provides a quick check for such problems.[PAR]",
        "The program can compare two run input ([REF].tpr[ref])",
        "files",
        "when both [TT]-s1[tt] and [TT]-s2[tt] are supplied.",
        "Similarly a pair of trajectory files can be compared (using the [TT]-f2[tt]",
        "option), or a pair of energy files (using the [TT]-e2[tt] option).[PAR]",
        "For free energy simulations the A and B state topology from one",
        "run input file can be compared with options [TT]-s1[tt] and [TT]-ab[tt].[PAR]",
        "In case the [TT]-m[tt] flag is given a LaTeX file will be written",
        "consisting of a rough outline for a methods section for a paper."
    };
    t_filenm          fnm[] = {
        { efTRX, "-f",  nullptr, ffOPTRD },
        { efTRX, "-f2",  nullptr, ffOPTRD },
        { efTPR, "-s1", "top1", ffOPTRD },
        { efTPR, "-s2", "top2", ffOPTRD },
        { efTPS, "-c",  nullptr, ffOPTRD },
        { efEDR, "-e",  nullptr, ffOPTRD },
        { efEDR, "-e2", "ener2", ffOPTRD },
        { efNDX, "-n",  nullptr, ffOPTRD },
        { efTEX, "-m",  nullptr, ffOPTWR }
    };
#define NFILE asize(fnm)
    const char       *fn1 = nullptr, *fn2 = nullptr, *tex = nullptr;

    gmx_output_env_t *oenv;
    static real       vdw_fac  = 0.8;
    static real       bon_lo   = 0.4;
    static real       bon_hi   = 0.7;
    static gmx_bool   bRMSD    = FALSE;
    static real       ftol     = 0.001;
    static real       abstol   = 0.001;
    static gmx_bool   bCompAB  = FALSE;
    static char      *lastener = nullptr;
    static t_pargs    pa[]     = {
        { "-vdwfac", FALSE, etREAL, {&vdw_fac},
          "Fraction of sum of VdW radii used as warning cutoff" },
        { "-bonlo",  FALSE, etREAL, {&bon_lo},
          "Min. fract. of sum of VdW radii for bonded atoms" },
        { "-bonhi",  FALSE, etREAL, {&bon_hi},
          "Max. fract. of sum of VdW radii for bonded atoms" },
        { "-rmsd",   FALSE, etBOOL, {&bRMSD},
          "Print RMSD for x, v and f" },
        { "-tol",    FALSE, etREAL, {&ftol},
          "Relative tolerance for comparing real values defined as [MATH]2*(a-b)/([MAG]a[mag]+[MAG]b[mag])[math]" },
        { "-abstol",    FALSE, etREAL, {&abstol},
          "Absolute tolerance, useful when sums are close to zero." },
        { "-ab",     FALSE, etBOOL, {&bCompAB},
          "Compare the A and B topology from one file" },
        { "-lastener", FALSE, etSTR,  {&lastener},
          "Last energy term to compare (if not given all are tested). It makes sense to go up until the Pressure." }
    };

    if (!parse_common_args(&argc, argv, 0, NFILE, fnm, asize(pa), pa,
                           asize(desc), desc, 0, nullptr, &oenv))
    {
        return 0;
    }

    fn1 = opt2fn_null("-f", NFILE, fnm);
    fn2 = opt2fn_null("-f2", NFILE, fnm);
    tex = opt2fn_null("-m", NFILE, fnm);
    if (fn1 && fn2)
    {
        comp_trx(oenv, fn1, fn2, bRMSD, ftol, abstol);
    }
    else if (fn1)
    {
        chk_trj(oenv, fn1, opt2fn_null("-s1", NFILE, fnm), ftol);
    }
    else if (fn2)
    {
        fprintf(stderr, "Please give me TWO trajectory (.xtc/.trr/.tng) files!\n");
    }

    fn1 = opt2fn_null("-s1", NFILE, fnm);
    fn2 = opt2fn_null("-s2", NFILE, fnm);
    if ((fn1 && fn2) || bCompAB)
    {
        if (bCompAB)
        {
            if (fn1 == nullptr)
            {
                gmx_fatal(FARGS, "With -ab you need to set the -s1 option");
            }
            fn2 = nullptr;
        }
        comp_tpx(fn1, fn2, bRMSD, ftol, abstol);
    }
    else if (fn1 && tex)
    {
        tpx2methods(fn1, tex);
    }
    else if ((fn1 && !opt2fn_null("-f", NFILE, fnm)) || (!fn1 && fn2))
    {
        fprintf(stderr, "Please give me TWO run input (.tpr) files\n"
                "or specify the -m flag to generate a methods.tex file\n");
    }

    fn1 = opt2fn_null("-e", NFILE, fnm);
    fn2 = opt2fn_null("-e2", NFILE, fnm);
    if (fn1 && fn2)
    {
        comp_enx(fn1, fn2, ftol, abstol, lastener);
    }
    else if (fn1)
    {
        chk_enx(ftp2fn(efEDR, NFILE, fnm));
    }
    else if (fn2)
    {
        fprintf(stderr, "Please give me TWO energy (.edr/.ene) files!\n");
    }

    if (ftp2bSet(efTPS, NFILE, fnm))
    {
        chk_tps(ftp2fn(efTPS, NFILE, fnm), vdw_fac, bon_lo, bon_hi);
    }

    if (ftp2bSet(efNDX, NFILE, fnm))
    {
        chk_ndx(ftp2fn(efNDX, NFILE, fnm));
    }

    return 0;
}