Cleaned up memory usage in gmx traj and trjconv

[gromacs.git] / src / gromacs / gmxana / gmx_traj.cpp

/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright (c) 1991-2000, University of Groningen, The Netherlands.
 * Copyright (c) 2001-2004, 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 <cstdlib>
#include <cstring>

#include <algorithm>
#include <string>

#include "gromacs/commandline/pargs.h"
#include "gromacs/commandline/viewit.h"
#include "gromacs/fileio/confio.h"
#include "gromacs/fileio/trxio.h"
#include "gromacs/fileio/xvgr.h"
#include "gromacs/gmxana/gmx_ana.h"
#include "gromacs/linearalgebra/nrjac.h"
#include "gromacs/math/functions.h"
#include "gromacs/math/units.h"
#include "gromacs/math/vec.h"
#include "gromacs/mdtypes/md_enums.h"
#include "gromacs/pbcutil/pbc.h"
#include "gromacs/pbcutil/rmpbc.h"
#include "gromacs/topology/index.h"
#include "gromacs/topology/topology.h"
#include "gromacs/trajectory/trajectoryframe.h"
#include "gromacs/utility/arraysize.h"
#include "gromacs/utility/cstringutil.h"
#include "gromacs/utility/fatalerror.h"
#include "gromacs/utility/futil.h"
#include "gromacs/utility/smalloc.h"

static void low_print_data(FILE *fp, real time, rvec x[], int n, int *index,
                           gmx_bool bDim[], const char *sffmt)
{
    int i, ii, d;

    fprintf(fp, " %g", time);
    for (i = 0; i < n; i++)
    {
        if (index != nullptr)
        {
            ii = index[i];
        }
        else
        {
            ii = i;
        }
        for (d = 0; d < DIM; d++)
        {
            if (bDim[d])
            {
                fprintf(fp, sffmt, x[ii][d]);
            }
        }
        if (bDim[DIM])
        {
            fprintf(fp, sffmt, norm(x[ii]));
        }
    }
    fprintf(fp, "\n");
}

static void average_data(rvec x[], rvec xav[], real *mass,
                         int ngrps, int isize[], int **index)
{
    int    g, i, ind, d;
    real   m;
    rvec   tmp;
    double sum[DIM], mtot;

    for (g = 0; g < ngrps; g++)
    {
        clear_dvec(sum);
        clear_rvec(xav[g]);
        mtot = 0;
        for (i = 0; i < isize[g]; i++)
        {
            ind = index[g][i];
            if (mass != nullptr)
            {
                m = mass[ind];
                svmul(m, x[ind], tmp);
                for (d = 0; d < DIM; d++)
                {
                    sum[d] += tmp[d];
                }
                mtot += m;
            }
            else
            {
                for (d = 0; d < DIM; d++)
                {
                    sum[d] += x[ind][d];
                }
            }
        }
        if (mass != nullptr)
        {
            for (d = 0; d < DIM; d++)
            {
                xav[g][d] = sum[d]/mtot;
            }
        }
        else
        {
            /* mass=NULL, so these are forces: sum only (do not average) */
            for (d = 0; d < DIM; d++)
            {
                xav[g][d] = sum[d];
            }
        }
    }
}

static void print_data(FILE *fp, real time, rvec x[], real *mass, gmx_bool bCom,
                       int ngrps, int isize[], int **index, gmx_bool bDim[],
                       const char *sffmt)
{
    static rvec *xav = nullptr;

    if (bCom)
    {
        if (xav == nullptr)
        {
            snew(xav, ngrps);
        }
        average_data(x, xav, mass, ngrps, isize, index);
        low_print_data(fp, time, xav, ngrps, nullptr, bDim, sffmt);
    }
    else
    {
        low_print_data(fp, time, x, isize[0], index[0], bDim, sffmt);
    }
}

static void write_trx_x(t_trxstatus *status, const t_trxframe *fr, real *mass, gmx_bool bCom,
                        int ngrps, int isize[], int **index)
{
    static rvec    *xav   = nullptr;
    static t_atoms *atoms = nullptr;
    t_trxframe      fr_av;
    int             i;

    if (bCom)
    {
        if (xav == nullptr)
        {
            snew(xav, ngrps);
            snew(atoms, 1);
            *atoms = *fr->atoms;
            snew(atoms->atom, ngrps);
            atoms->nr = ngrps;
            /* Note that atom and residue names will be the ones
             * of the first atom in each group.
             */
            for (i = 0; i < ngrps; i++)
            {
                atoms->atom[i]     = fr->atoms->atom[index[i][0]];
                atoms->atomname[i] = fr->atoms->atomname[index[i][0]];
            }
        }
        average_data(fr->x, xav, mass, ngrps, isize, index);
        fr_av        = *fr;
        fr_av.natoms = ngrps;
        fr_av.atoms  = atoms;
        fr_av.x      = xav;
        write_trxframe(status, &fr_av, nullptr);
    }
    else
    {
        write_trxframe_indexed(status, fr, isize[0], index[0], nullptr);
    }
}

static void make_legend(FILE *fp, int ngrps, int isize, int index[],
                        char **name, gmx_bool bCom, gmx_bool bMol, gmx_bool bDim[],
                        const gmx_output_env_t *oenv)
{
    char      **leg;
    const char *dimtxt[] = { " X", " Y", " Z", "" };
    int         n, i, j, d;

    if (bCom)
    {
        n = ngrps;
    }
    else
    {
        n = isize;
    }

    snew(leg, 4*n);
    j = 0;
    for (i = 0; i < n; i++)
    {
        for (d = 0; d <= DIM; d++)
        {
            if (bDim[d])
            {
                snew(leg[j], STRLEN);
                if (bMol)
                {
                    sprintf(leg[j], "mol %d%s", index[i]+1, dimtxt[d]);
                }
                else if (bCom)
                {
                    sprintf(leg[j], "%s%s", name[i], dimtxt[d]);
                }
                else
                {
                    sprintf(leg[j], "atom %d%s", index[i]+1, dimtxt[d]);
                }
                j++;
            }
        }
    }
    xvgr_legend(fp, j, (const char**)leg, oenv);

    for (i = 0; i < j; i++)
    {
        sfree(leg[i]);
    }
    sfree(leg);
}

static real ekrot(rvec x[], rvec v[], real mass[], int isize, int index[])
{
    static real **TCM = nullptr, **L;
    double        tm, m0, lxx, lxy, lxz, lyy, lyz, lzz, ekrot;
    rvec          a0, ocm;
    dvec          dx, b0;
    dvec          xcm, vcm, acm;
    int           i, j, m, n;

    if (TCM == nullptr)
    {
        snew(TCM, DIM);
        for (i = 0; i < DIM; i++)
        {
            snew(TCM[i], DIM);
        }
        snew(L, DIM);
        for (i = 0; i < DIM; i++)
        {
            snew(L[i], DIM);
        }
    }

    clear_dvec(xcm);
    clear_dvec(vcm);
    clear_dvec(acm);
    tm = 0.0;
    for (i = 0; i < isize; i++)
    {
        j   = index[i];
        m0  = mass[j];
        tm += m0;
        cprod(x[j], v[j], a0);
        for (m = 0; (m < DIM); m++)
        {
            xcm[m] += m0*x[j][m]; /* c.o.m. position */
            vcm[m] += m0*v[j][m]; /* c.o.m. velocity */
            acm[m] += m0*a0[m];   /* rotational velocity around c.o.m. */
        }
    }
    dcprod(xcm, vcm, b0);
    for (m = 0; (m < DIM); m++)
    {
        xcm[m] /= tm;
        vcm[m] /= tm;
        acm[m] -= b0[m]/tm;
    }

    lxx = lxy = lxz = lyy = lyz = lzz = 0.0;
    for (i = 0; i < isize; i++)
    {
        j  = index[i];
        m0 = mass[j];
        for (m = 0; m < DIM; m++)
        {
            dx[m] = x[j][m] - xcm[m];
        }
        lxx += dx[XX]*dx[XX]*m0;
        lxy += dx[XX]*dx[YY]*m0;
        lxz += dx[XX]*dx[ZZ]*m0;
        lyy += dx[YY]*dx[YY]*m0;
        lyz += dx[YY]*dx[ZZ]*m0;
        lzz += dx[ZZ]*dx[ZZ]*m0;
    }

    L[XX][XX] =  lyy + lzz;
    L[YY][XX] = -lxy;
    L[ZZ][XX] = -lxz;
    L[XX][YY] = -lxy;
    L[YY][YY] =  lxx + lzz;
    L[ZZ][YY] = -lyz;
    L[XX][ZZ] = -lxz;
    L[YY][ZZ] = -lyz;
    L[ZZ][ZZ] =  lxx + lyy;

    m_inv_gen(L, DIM, TCM);

    /* Compute omega (hoeksnelheid) */
    clear_rvec(ocm);
    ekrot = 0;
    for (m = 0; m < DIM; m++)
    {
        for (n = 0; n < DIM; n++)
        {
            ocm[m] += TCM[m][n]*acm[n];
        }
        ekrot += 0.5*ocm[m]*acm[m];
    }

    return ekrot;
}

static real ektrans(rvec v[], real mass[], int isize, int index[])
{
    dvec   mvcom;
    double mtot;
    int    i, j, d;

    clear_dvec(mvcom);
    mtot = 0;
    for (i = 0; i < isize; i++)
    {
        j = index[i];
        for (d = 0; d < DIM; d++)
        {
            mvcom[d] += mass[j]*v[j][d];
        }
        mtot += mass[j];
    }

    return dnorm2(mvcom)/(mtot*2);
}

static real temp(rvec v[], real mass[], int isize, int index[])
{
    double ekin2;
    int    i, j;

    ekin2 = 0;
    for (i = 0; i < isize; i++)
    {
        j      = index[i];
        ekin2 += mass[j]*norm2(v[j]);
    }

    return ekin2/(3*isize*BOLTZ);
}

static void remove_jump(matrix box, int natoms, rvec xp[], rvec x[])
{
    rvec hbox;
    int  d, i, m;

    for (d = 0; d < DIM; d++)
    {
        hbox[d] = 0.5*box[d][d];
    }
    for (i = 0; i < natoms; i++)
    {
        for (m = DIM-1; m >= 0; m--)
        {
            while (x[i][m]-xp[i][m] <= -hbox[m])
            {
                for (d = 0; d <= m; d++)
                {
                    x[i][d] += box[m][d];
                }
            }
            while (x[i][m]-xp[i][m] > hbox[m])
            {
                for (d = 0; d <= m; d++)
                {
                    x[i][d] -= box[m][d];
                }
            }
        }
    }
}

static void write_pdb_bfac(const char *fname, const char *xname,
                           const char *title, t_atoms *atoms, int ePBC, matrix box,
                           int isize, int *index, int nfr_x, rvec *x,
                           int nfr_v, rvec *sum,
                           gmx_bool bDim[], real scale_factor,
                           const gmx_output_env_t *oenv)
{
    FILE       *fp;
    real        max, len2, scale;
    int         maxi;
    int         i, m, onedim;

    if ((nfr_x == 0) || (nfr_v == 0))
    {
        fprintf(stderr, "No frames found for %s, will not write %s\n",
                title, fname);
    }
    else
    {
        fprintf(stderr, "Used %d frames for %s\n", nfr_x, "coordinates");
        fprintf(stderr, "Used %d frames for %s\n", nfr_v, title);
        onedim = -1;
        if (!bDim[DIM])
        {
            m = 0;
            for (i = 0; i < DIM; i++)
            {
                if (bDim[i])
                {
                    onedim = i;
                    m++;
                }
            }
            if (m != 1)
            {
                onedim = -1;
            }
        }
        scale = 1.0/nfr_v;
        for (i = 0; i < isize; i++)
        {
            svmul(scale, sum[index[i]], sum[index[i]]);
        }

        fp = xvgropen(xname, title, "Atom", "Spatial component", oenv);
        for (i = 0; i < isize; i++)
        {
            fprintf(fp, "%-5d  %10.3f  %10.3f  %10.3f\n", 1+i,
                    sum[index[i]][XX], sum[index[i]][YY], sum[index[i]][ZZ]);
        }
        xvgrclose(fp);
        max  = 0;
        maxi = 0;
        for (i = 0; i < isize; i++)
        {
            len2 = 0;
            for (m = 0; m < DIM; m++)
            {
                if (bDim[m] || bDim[DIM])
                {
                    len2 += gmx::square(sum[index[i]][m]);
                }
            }
            if (len2 > max)
            {
                max  = len2;
                maxi = index[i];
            }
        }
        if (scale_factor != 0)
        {
            scale = scale_factor;
        }
        else
        {
            if (max == 0)
            {
                scale = 1;
            }
            else
            {
                scale = 10.0/std::sqrt(max);
            }
        }

        printf("Maximum %s is %g on atom %d %s, res. %s %d\n",
               title, std::sqrt(max), maxi+1, *(atoms->atomname[maxi]),
               *(atoms->resinfo[atoms->atom[maxi].resind].name),
               atoms->resinfo[atoms->atom[maxi].resind].nr);

        if (atoms->pdbinfo == nullptr)
        {
            snew(atoms->pdbinfo, atoms->nr);
        }
        atoms->havePdbInfo = TRUE;

        if (onedim == -1)
        {
            for (i = 0; i < isize; i++)
            {
                len2 = 0;
                for (m = 0; m < DIM; m++)
                {
                    if (bDim[m] || bDim[DIM])
                    {
                        len2 += gmx::square(sum[index[i]][m]);
                    }
                }
                atoms->pdbinfo[index[i]].bfac = std::sqrt(len2)*scale;
            }
        }
        else
        {
            for (i = 0; i < isize; i++)
            {
                atoms->pdbinfo[index[i]].bfac = sum[index[i]][onedim]*scale;
            }
        }
        write_sto_conf_indexed(fname, title, atoms, x, nullptr, ePBC, box, isize, index);
    }
}

static void update_histo(int gnx, int index[], rvec v[],
                         int *nhisto, int **histo, real binwidth)
{
    int  i, m, in, nnn;
    real vn, vnmax;

    if (*histo == nullptr)
    {
        vnmax = 0;
        for (i = 0; (i < gnx); i++)
        {
            vn    = norm(v[index[i]]);
            vnmax = std::max(vn, vnmax);
        }
        vnmax  *= 2;
        *nhisto = static_cast<int>(1+(vnmax/binwidth));
        snew(*histo, *nhisto);
    }
    for (i = 0; (i < gnx); i++)
    {
        vn = norm(v[index[i]]);
        in = static_cast<int>(vn/binwidth);
        if (in >= *nhisto)
        {
            nnn = in+100;
            fprintf(stderr, "Extending histogram from %d to %d\n", *nhisto, nnn);

            srenew(*histo, nnn);
            for (m = *nhisto; (m < nnn); m++)
            {
                (*histo)[m] = 0;
            }
            *nhisto = nnn;
        }
        (*histo)[in]++;
    }
}

static void print_histo(const char *fn, int nhisto, int histo[], real binwidth,
                        const gmx_output_env_t *oenv)
{
    FILE *fp;
    int   i;

    fp = xvgropen(fn, "Velocity distribution", "V (nm/ps)", "arbitrary units",
                  oenv);
    for (i = 0; (i < nhisto); i++)
    {
        fprintf(fp, "%10.3e  %10d\n", i*binwidth, histo[i]);
    }
    xvgrclose(fp);
}

int gmx_traj(int argc, char *argv[])
{
    const char       *desc[] = {
        "[THISMODULE] plots coordinates, velocities, forces and/or the box.",
        "With [TT]-com[tt] the coordinates, velocities and forces are",
        "calculated for the center of mass of each group.",
        "When [TT]-mol[tt] is set, the numbers in the index file are",
        "interpreted as molecule numbers and the same procedure as with",
        "[TT]-com[tt] is used for each molecule.[PAR]",
        "Option [TT]-ot[tt] plots the temperature of each group,",
        "provided velocities are present in the trajectory file.",
        "No corrections are made for constrained degrees of freedom!",
        "This implies [TT]-com[tt].[PAR]",
        "Options [TT]-ekt[tt] and [TT]-ekr[tt] plot the translational and",
        "rotational kinetic energy of each group,",
        "provided velocities are present in the trajectory file.",
        "This implies [TT]-com[tt].[PAR]",
        "Options [TT]-cv[tt] and [TT]-cf[tt] write the average velocities",
        "and average forces as temperature factors to a [REF].pdb[ref] file with",
        "the average coordinates or the coordinates at [TT]-ctime[tt].",
        "The temperature factors are scaled such that the maximum is 10.",
        "The scaling can be changed with the option [TT]-scale[tt].",
        "To get the velocities or forces of one",
        "frame set both [TT]-b[tt] and [TT]-e[tt] to the time of",
        "desired frame. When averaging over frames you might need to use",
        "the [TT]-nojump[tt] option to obtain the correct average coordinates.",
        "If you select either of these option the average force and velocity",
        "for each atom are written to an [REF].xvg[ref] file as well",
        "(specified with [TT]-av[tt] or [TT]-af[tt]).[PAR]",
        "Option [TT]-vd[tt] computes a velocity distribution, i.e. the",
        "norm of the vector is plotted. In addition in the same graph",
        "the kinetic energy distribution is given.",
        "",
        "See [gmx-trajectory] for plotting similar data for selections."
    };
    static gmx_bool   bMol    = FALSE, bCom = FALSE, bPBC = TRUE, bNoJump = FALSE;
    static gmx_bool   bX      = TRUE, bY = TRUE, bZ = TRUE, bNorm = FALSE, bFP = FALSE;
    static int        ngroups = 1;
    static real       ctime   = -1, scale = 0, binwidth = 1;
    t_pargs           pa[]    = {
        { "-com", FALSE, etBOOL, {&bCom},
          "Plot data for the com of each group" },
        { "-pbc", FALSE, etBOOL, {&bPBC},
          "Make molecules whole for COM" },
        { "-mol", FALSE, etBOOL, {&bMol},
          "Index contains molecule numbers iso atom numbers" },
        { "-nojump", FALSE, etBOOL, {&bNoJump},
          "Remove jumps of atoms across the box" },
        { "-x", FALSE, etBOOL, {&bX},
          "Plot X-component" },
        { "-y", FALSE, etBOOL, {&bY},
          "Plot Y-component" },
        { "-z", FALSE, etBOOL, {&bZ},
          "Plot Z-component" },
        { "-ng",       FALSE, etINT, {&ngroups},
          "Number of groups to consider" },
        { "-len", FALSE, etBOOL, {&bNorm},
          "Plot vector length" },
        { "-fp", FALSE, etBOOL, {&bFP},
          "Full precision output" },
        { "-bin", FALSE, etREAL, {&binwidth},
          "Binwidth for velocity histogram (nm/ps)" },
        { "-ctime", FALSE, etREAL, {&ctime},
          "Use frame at this time for x in [TT]-cv[tt] and [TT]-cf[tt] instead of the average x" },
        { "-scale", FALSE, etREAL, {&scale},
          "Scale factor for [REF].pdb[ref] output, 0 is autoscale" }
    };
    FILE             *outx   = nullptr, *outv = nullptr, *outf = nullptr, *outb = nullptr, *outt = nullptr;
    FILE             *outekt = nullptr, *outekr = nullptr;
    t_topology        top;
    int               ePBC;
    real             *mass, time;
    const char       *indexfn;
    t_trxframe        fr;
    int               flags, nvhisto = 0, *vhisto = nullptr;
    rvec             *xtop, *xp = nullptr;
    rvec             *sumx = nullptr, *sumv = nullptr, *sumf = nullptr;
    matrix            topbox;
    t_trxstatus      *status;
    t_trxstatus      *status_out = nullptr;
    gmx_rmpbc_t       gpbc       = nullptr;
    int               i, j;
    int               nr_xfr, nr_vfr, nr_ffr;
    char            **grpname;
    int              *isize0, *isize;
    int             **index0, **index;
    int              *atndx;
    t_block          *mols;
    gmx_bool          bTop, bOX, bOXT, bOV, bOF, bOB, bOT, bEKT, bEKR, bCV, bCF;
    gmx_bool          bDim[4], bDum[4], bVD;
    char              sffmt[STRLEN], sffmt6[STRLEN];
    const char       *box_leg[6] = { "XX", "YY", "ZZ", "YX", "ZX", "ZY" };
    gmx_output_env_t *oenv;

    t_filenm          fnm[] = {
        { efTRX, "-f", nullptr, ffREAD },
        { efTPS, nullptr, nullptr, ffREAD },
        { efNDX, nullptr, nullptr, ffOPTRD },
        { efXVG, "-ox",  "coord",     ffOPTWR },
        { efTRX, "-oxt", "coord",     ffOPTWR },
        { efXVG, "-ov",  "veloc",     ffOPTWR },
        { efXVG, "-of",  "force",     ffOPTWR },
        { efXVG, "-ob",  "box",       ffOPTWR },
        { efXVG, "-ot",  "temp",      ffOPTWR },
        { efXVG, "-ekt", "ektrans",   ffOPTWR },
        { efXVG, "-ekr", "ekrot",     ffOPTWR },
        { efXVG, "-vd",  "veldist",   ffOPTWR },
        { efPDB, "-cv",  "veloc",     ffOPTWR },
        { efPDB, "-cf",  "force",     ffOPTWR },
        { efXVG, "-av",  "all_veloc", ffOPTWR },
        { efXVG, "-af",  "all_force", ffOPTWR }
    };
#define NFILE asize(fnm)

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

    if (bMol)
    {
        fprintf(stderr, "Interpreting indexfile entries as molecules.\n"
                "Using center of mass.\n");
    }

    bOX  = opt2bSet("-ox", NFILE, fnm);
    bOXT = opt2bSet("-oxt", NFILE, fnm);
    bOV  = opt2bSet("-ov", NFILE, fnm);
    bOF  = opt2bSet("-of", NFILE, fnm);
    bOB  = opt2bSet("-ob", NFILE, fnm);
    bOT  = opt2bSet("-ot", NFILE, fnm);
    bEKT = opt2bSet("-ekt", NFILE, fnm);
    bEKR = opt2bSet("-ekr", NFILE, fnm);
    bCV  = opt2bSet("-cv", NFILE, fnm) || opt2bSet("-av", NFILE, fnm);
    bCF  = opt2bSet("-cf", NFILE, fnm) || opt2bSet("-af", NFILE, fnm);
    bVD  = opt2bSet("-vd", NFILE, fnm) || opt2parg_bSet("-bin", asize(pa), pa);
    if (bMol || bOT || bEKT || bEKR)
    {
        bCom = TRUE;
    }

    bDim[XX]  = bX;
    bDim[YY]  = bY;
    bDim[ZZ]  = bZ;
    bDim[DIM] = bNorm;

    if (bFP)
    {
        sprintf(sffmt, "\t%s", gmx_real_fullprecision_pfmt);
    }
    else
    {
        sprintf(sffmt, "\t%%g");
    }
    sprintf(sffmt6, "%s%s%s%s%s%s", sffmt, sffmt, sffmt, sffmt, sffmt, sffmt);

    bTop = read_tps_conf(ftp2fn(efTPS, NFILE, fnm), &top, &ePBC,
                         &xtop, nullptr, topbox,
                         bCom && (bOX || bOXT || bOV || bOT || bEKT || bEKR));
    sfree(xtop);
    if ((bMol || bCV || bCF) && !bTop)
    {
        gmx_fatal(FARGS, "Need a run input file for option -mol, -cv or -cf");
    }

    if (bMol)
    {
        indexfn = ftp2fn(efNDX, NFILE, fnm);
    }
    else
    {
        indexfn = ftp2fn_null(efNDX, NFILE, fnm);
    }

    if (!(bCom && !bMol))
    {
        ngroups = 1;
    }
    snew(grpname, ngroups);
    snew(isize0, ngroups);
    snew(index0, ngroups);
    get_index(&(top.atoms), indexfn, ngroups, isize0, index0, grpname);

    if (bMol)
    {
        mols    = &(top.mols);
        atndx   = mols->index;
        ngroups = isize0[0];
        snew(isize, ngroups);
        snew(index, ngroups);
        for (i = 0; i < ngroups; i++)
        {
            if (index0[0][i] < 0 || index0[0][i] >= mols->nr)
            {
                gmx_fatal(FARGS, "Molecule index (%d) is out of range (%d-%d)",
                          index0[0][i]+1, 1, mols->nr);
            }
            isize[i] = atndx[index0[0][i]+1] - atndx[index0[0][i]];
            snew(index[i], isize[i]);
            for (j = 0; j < isize[i]; j++)
            {
                index[i][j] = atndx[index0[0][i]] + j;
            }
        }
    }
    else
    {
        isize = isize0;
        index = index0;
    }
    if (bCom)
    {
        snew(mass, top.atoms.nr);
        for (i = 0; i < top.atoms.nr; i++)
        {
            mass[i] = top.atoms.atom[i].m;
        }
    }
    else
    {
        mass = nullptr;
    }

    flags = 0;
    std::string label(output_env_get_xvgr_tlabel(oenv));
    if (bOX)
    {
        flags = flags | TRX_READ_X;
        outx  = xvgropen(opt2fn("-ox", NFILE, fnm),
                         bCom ? "Center of mass" : "Coordinate",
                         label, "Coordinate (nm)", oenv);
        make_legend(outx, ngroups, isize0[0], index0[0], grpname, bCom, bMol, bDim, oenv);
    }
    if (bOXT)
    {
        flags      = flags | TRX_READ_X;
        status_out = open_trx(opt2fn("-oxt", NFILE, fnm), "w");
    }
    if (bOV)
    {
        flags = flags | TRX_READ_V;
        outv  = xvgropen(opt2fn("-ov", NFILE, fnm),
                         bCom ? "Center of mass velocity" : "Velocity",
                         label, "Velocity (nm/ps)", oenv);
        make_legend(outv, ngroups, isize0[0], index0[0], grpname, bCom, bMol, bDim, oenv);
    }
    if (bOF)
    {
        flags = flags | TRX_READ_F;
        outf  = xvgropen(opt2fn("-of", NFILE, fnm), "Force",
                         label, "Force (kJ mol\\S-1\\N nm\\S-1\\N)",
                         oenv);
        make_legend(outf, ngroups, isize0[0], index0[0], grpname, bCom, bMol, bDim, oenv);
    }
    if (bOB)
    {
        outb = xvgropen(opt2fn("-ob", NFILE, fnm), "Box vector elements",
                        label, "(nm)", oenv);

        xvgr_legend(outb, 6, box_leg, oenv);
    }
    if (bOT)
    {
        bDum[XX]  = FALSE;
        bDum[YY]  = FALSE;
        bDum[ZZ]  = FALSE;
        bDum[DIM] = TRUE;
        flags     = flags | TRX_READ_V;
        outt      = xvgropen(opt2fn("-ot", NFILE, fnm), "Temperature",
                             label, "(K)", oenv);
        make_legend(outt, ngroups, isize[0], index[0], grpname, bCom, bMol, bDum, oenv);
    }
    if (bEKT)
    {
        bDum[XX]  = FALSE;
        bDum[YY]  = FALSE;
        bDum[ZZ]  = FALSE;
        bDum[DIM] = TRUE;
        flags     = flags | TRX_READ_V;
        outekt    = xvgropen(opt2fn("-ekt", NFILE, fnm), "Center of mass translation",
                             label, "Energy (kJ mol\\S-1\\N)", oenv);
        make_legend(outekt, ngroups, isize[0], index[0], grpname, bCom, bMol, bDum, oenv);
    }
    if (bEKR)
    {
        bDum[XX]  = FALSE;
        bDum[YY]  = FALSE;
        bDum[ZZ]  = FALSE;
        bDum[DIM] = TRUE;
        flags     = flags | TRX_READ_X | TRX_READ_V;
        outekr    = xvgropen(opt2fn("-ekr", NFILE, fnm), "Center of mass rotation",
                             label, "Energy (kJ mol\\S-1\\N)", oenv);
        make_legend(outekr, ngroups, isize[0], index[0], grpname, bCom, bMol, bDum, oenv);
    }
    if (bVD)
    {
        flags = flags | TRX_READ_V;
    }
    if (bCV)
    {
        flags = flags | TRX_READ_X | TRX_READ_V;
    }
    if (bCF)
    {
        flags = flags | TRX_READ_X | TRX_READ_F;
    }
    if ((flags == 0) && !bOB)
    {
        fprintf(stderr, "Please select one or more output file options\n");
        exit(0);
    }

    read_first_frame(oenv, &status, ftp2fn(efTRX, NFILE, fnm), &fr, flags);


    if ((bOV || bOF) && fn2ftp(ftp2fn(efTRX, NFILE, fnm)) == efXTC)
    {
        gmx_fatal(FARGS, "Cannot extract velocities or forces since your input XTC file does not contain them.");
    }

    if (bCV || bCF)
    {
        snew(sumx, fr.natoms);
    }
    if (bCV)
    {
        snew(sumv, fr.natoms);
    }
    if (bCF)
    {
        snew(sumf, fr.natoms);
    }
    nr_xfr = 0;
    nr_vfr = 0;
    nr_ffr = 0;

    if (bCom && bPBC)
    {
        gpbc = gmx_rmpbc_init(&top.idef, ePBC, fr.natoms);
    }

    do
    {
        time = output_env_conv_time(oenv, fr.time);

        if (fr.bX && bNoJump && fr.bBox)
        {
            if (xp)
            {
                remove_jump(fr.box, fr.natoms, xp, fr.x);
            }
            else
            {
                snew(xp, fr.natoms);
            }
            for (i = 0; i < fr.natoms; i++)
            {
                copy_rvec(fr.x[i], xp[i]);
            }
        }

        if (fr.bX && bCom && bPBC)
        {
            gmx_rmpbc_trxfr(gpbc, &fr);
        }

        if (bVD && fr.bV)
        {
            update_histo(isize[0], index[0], fr.v, &nvhisto, &vhisto, binwidth);
        }

        if (bOX && fr.bX)
        {
            print_data(outx, time, fr.x, mass, bCom, ngroups, isize, index, bDim, sffmt);
        }
        if (bOXT && fr.bX)
        {
            t_trxframe frout = fr;
            if (!frout.bAtoms)
            {
                frout.atoms  = &top.atoms;
                frout.bAtoms = TRUE;
            }
            frout.bV = FALSE;
            frout.bF = FALSE;
            write_trx_x(status_out, &frout, mass, bCom, ngroups, isize, index);
        }
        if (bOV && fr.bV)
        {
            print_data(outv, time, fr.v, mass, bCom, ngroups, isize, index, bDim, sffmt);
        }
        if (bOF && fr.bF)
        {
            print_data(outf, time, fr.f, nullptr, bCom, ngroups, isize, index, bDim, sffmt);
        }
        if (bOB && fr.bBox)
        {
            fprintf(outb, "\t%g", fr.time);
            fprintf(outb, sffmt6,
                    fr.box[XX][XX], fr.box[YY][YY], fr.box[ZZ][ZZ],
                    fr.box[YY][XX], fr.box[ZZ][XX], fr.box[ZZ][YY]);
            fprintf(outb, "\n");
        }
        if (bOT && fr.bV)
        {
            fprintf(outt, " %g", time);
            for (i = 0; i < ngroups; i++)
            {
                fprintf(outt, sffmt, temp(fr.v, mass, isize[i], index[i]));
            }
            fprintf(outt, "\n");
        }
        if (bEKT && fr.bV)
        {
            fprintf(outekt, " %g", time);
            for (i = 0; i < ngroups; i++)
            {
                fprintf(outekt, sffmt, ektrans(fr.v, mass, isize[i], index[i]));
            }
            fprintf(outekt, "\n");
        }
        if (bEKR && fr.bX && fr.bV)
        {
            fprintf(outekr, " %g", time);
            for (i = 0; i < ngroups; i++)
            {
                fprintf(outekr, sffmt, ekrot(fr.x, fr.v, mass, isize[i], index[i]));
            }
            fprintf(outekr, "\n");
        }
        if ((bCV || bCF) && fr.bX &&
            (ctime < 0 || (fr.time >= ctime*0.999999 &&
                           fr.time <= ctime*1.000001)))
        {
            for (i = 0; i < fr.natoms; i++)
            {
                rvec_inc(sumx[i], fr.x[i]);
            }
            nr_xfr++;
        }
        if (bCV && fr.bV)
        {
            for (i = 0; i < fr.natoms; i++)
            {
                rvec_inc(sumv[i], fr.v[i]);
            }
            nr_vfr++;
        }
        if (bCF && fr.bF)
        {
            for (i = 0; i < fr.natoms; i++)
            {
                rvec_inc(sumf[i], fr.f[i]);
            }
            nr_ffr++;
        }

    }
    while (read_next_frame(oenv, status, &fr));

    if (gpbc != nullptr)
    {
        gmx_rmpbc_done(gpbc);
    }

    /* clean up a bit */
    close_trx(status);

    if (bOX)
    {
        xvgrclose(outx);
    }
    if (bOXT)
    {
        close_trx(status_out);
    }
    if (bOV)
    {
        xvgrclose(outv);
    }
    if (bOF)
    {
        xvgrclose(outf);
    }
    if (bOB)
    {
        xvgrclose(outb);
    }
    if (bOT)
    {
        xvgrclose(outt);
    }
    if (bEKT)
    {
        xvgrclose(outekt);
    }
    if (bEKR)
    {
        xvgrclose(outekr);
    }

    if (bVD)
    {
        print_histo(opt2fn("-vd", NFILE, fnm), nvhisto, vhisto, binwidth, oenv);
    }

    if (bCV || bCF)
    {
        if (nr_xfr > 1)
        {
            if (ePBC != epbcNONE && !bNoJump)
            {
                fprintf(stderr, "\nWARNING: More than one frame was used for option -cv or -cf\n"
                        "If atoms jump across the box you should use the -nojump or -ctime option\n\n");
            }
            for (i = 0; i < isize[0]; i++)
            {
                svmul(1.0/nr_xfr, sumx[index[0][i]], sumx[index[0][i]]);
            }
        }
        else if (nr_xfr == 0)
        {
            fprintf(stderr, "\nWARNING: No coordinate frames found for option -cv or -cf\n\n");
        }
    }
    if (bCV)
    {
        write_pdb_bfac(opt2fn("-cv", NFILE, fnm),
                       opt2fn("-av", NFILE, fnm), "average velocity", &(top.atoms),
                       ePBC, topbox, isize[0], index[0], nr_xfr, sumx,
                       nr_vfr, sumv, bDim, scale, oenv);
    }
    if (bCF)
    {
        write_pdb_bfac(opt2fn("-cf", NFILE, fnm),
                       opt2fn("-af", NFILE, fnm), "average force", &(top.atoms),
                       ePBC, topbox, isize[0], index[0], nr_xfr, sumx,
                       nr_ffr, sumf, bDim, scale, oenv);
    }

    /* view it */
    view_all(oenv, NFILE, fnm);

    done_top(&top);
    // Free index and isize only if they are distinct from index0 and isize0
    if (bMol)
    {
        for (int i = 0; i < ngroups; i++)
        {
            sfree(index[i]);
        }
        sfree(index);
        sfree(isize);
    }
    for (int i = 0; i < ngroups; i++)
    {
        sfree(index0[i]);
        sfree(grpname[i]);
    }
    sfree(index0);
    sfree(isize0);
    sfree(grpname);
    done_filenms(NFILE, fnm);
    done_frame(&fr);
    output_env_done(oenv);

    return 0;
}