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texprint.c

/*
 *  Copyright (c) by Ramu Ramanathan and Allin Cottrell
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

/* texprint.c for gretl - LaTeX output from modeling */

#include "libgretl.h"
#include "johansen.h"

#define tex_screen_zero(x)  ((fabs(x) > 1.0e-17)? x : 0.0)

static void tex_modify_exponent (char *numstr)
{
    char *p = strchr(numstr, 'e');

    if (p != NULL) {
      int expon = atoi(p + 1);
#if 0
      sprintf(p, "\\times 10^{%d}", expon);
#else
      sprintf(p, "\\mbox{e%s%d}", (expon > 0)? "+" : "", expon);
#endif
    }
}

/* prints a floating point number as a TeX math string.  if tab != 0,
   print the sign in front, separated by a tab symbol (for
   equation-style regression printout).
*/

static void tex_print_float (double x, PRN *prn)
{
    char number[48];

    x = tex_screen_zero(x);

    sprintf(number, "%#.*g", GRETL_DIGITS, x);
    tex_modify_exponent(number);
    pprintf(prn, "%s", (x < 0.0)? (number + 1) : number);
}

static void tex_print_signed_float (double x, PRN *prn)
{
    char number[48];

    x = tex_screen_zero(x);

    sprintf(number, "%#.*g", GRETL_DIGITS, x);
    tex_modify_exponent(number);

    if (x < 0.0) {
      pprintf(prn, "$-$%s", number + 1);
    } else {
      pputs(prn, number);
    }
}

static void tex_print_math_float (double x, PRN *prn)
{
    char number[48];

    x = tex_screen_zero(x);

    sprintf(number, "%#.*g", GRETL_DIGITS, x);
    tex_modify_exponent(number);

    pprintf(prn, "$%s$", number);
}

/**
 * tex_escape:
 * @targ: target string (must be pre-allocated)
 * @src: source string.
 *
 * Copies from @src to @targ, escaping any characters in @src that are 
 * special to TeX (by inserting a leading backslash).
 * 
 * Returns: the transformed copy of the string
 */

char *tex_escape (char *targ, const char *src)
{
    char *p = targ;

    while (*src) {
      if (*src == '$' || *src == '&' || *src == '_' || 
          *src == '%' || *src == '#')
          *targ++ = '\\';
      *targ++ = *src++;
    }
    *targ = '\0';

    return p;
}

#define UPPER_F_LIMIT (pow(10, GRETL_DIGITS))
#define LOWER_F_LIMIT (pow(10, -4))

static void cut_extra_zero (char *numstr)
{
    int s = strspn(numstr, "-.,0");
    int p = (s == 0 && (strchr(numstr, '.') || strchr(numstr, ',')));

    numstr[s + p + GRETL_DIGITS] = '\0';
}

void tex_dcolumn_double (double xx, char *numstr)
{
    double a;

    if (na(xx)) {
      strcpy(numstr, "\\multicolumn{1}{c}{}");
      return;
    }

    xx = screen_zero(xx);
    a = fabs(xx);

    sprintf(numstr, "%#.*g", GRETL_DIGITS, xx);

    if (a != 0.0 && (a >= UPPER_F_LIMIT || a < LOWER_F_LIMIT)) {
      int expon;
      char *p, exponstr[8];

      p = strchr(numstr, 'e');
      expon = atoi(p + 2);
      strcpy(p, "\\mbox{e");
      sprintf(exponstr, "%s%02d}", (xx > 10)? "+" : "-", expon);
      strcat(numstr, exponstr);
    } else {
      cut_extra_zero(numstr);
    }
}

static void tex_make_cname (char *cname, const char *src)
{
    char *p;
    unsigned char c;

    if (src == NULL || *src == '\0') return;

    p = strrchr(src, '_');
    if (p == NULL) {
      tex_escape(cname, src);
      return;
    }

    c = (unsigned char) *(p + 1);

    if (isdigit(c)) {
      int lag = atoi(++p);

      sprintf(cname, "$u_{t-%d}^2$", lag);
    } else {
      tex_escape(cname, src);
    }
}

static int tex_greek_param (char *targ, const char *src)
{
    *targ = 0;

    if (!strcmp(src, "alpha")) {
      strcpy(targ, "$\\alpha$");
    } else if (!strcmp(src, "beta")) {
      strcpy(targ, "$\\beta$");
    } else if (!strcmp(src, "gamma")) {
      strcpy(targ, "$\\gamma$");
    } else if (!strcmp(src, "delta")) {
      strcpy(targ, "$\\delta$");
    } else if (!strcmp(src, "pi")) {
      strcpy(targ, "$\\pi$");
    } else if (!strcmp(src, "lambda")) {
      strcpy(targ, "$\\lambda$");
    }

    return (*targ != 0);
}

static void tex_garch_coeff_name (char *targ, const char *src,
                          int inmath)
{
    char vname[VNAMELEN], vnesc[16];
    int lag;

    if (sscanf(src, "%[^(](%d)", vname, &lag) == 2) {
      /* e.g. "alpha(0)" */
      if (!inmath) {
          sprintf(targ, "$\\%s_%d$", vname, lag);
      } else {
          sprintf(targ, "\\%s_%d", vname, lag);
      }
    } else {
      /* regular variable name */
      tex_escape(vnesc, src);
      if (inmath) {
          sprintf(targ, "\\mbox{%s}", vnesc);
      } else {
          strcpy(targ, vnesc);
      }
    }
}

static void tex_arma_coeff_name (char *targ, const char *src,
                         int inmath)
{
    char vname[VNAMELEN], vnesc[16], texname[24];
    int lag;

    if (sscanf(src, "%[^(](-%d)", vname, &lag) == 2) {
      if (!strcmp(vname, "e")) {
          if (!inmath) {
            strcpy(texname, "$\\varepsilon$");
          } else {
            strcpy(texname, "\\varepsilon");
          }
      } else if (!strcmp(vname, "y")) {
          strcpy(texname, "y");
      } else {
          tex_escape(vnesc, vname);
          if (!inmath) {
            strcpy(texname, vnesc);
          } else {
            sprintf(texname, "\\mbox{%s}", vnesc);
          }
      }
      if (!inmath) {
          sprintf(targ, "%s$_{t-%d}$", texname, lag);
      } else {
          sprintf(targ, "%s_{t-%d}", texname, lag);
      }
    } else {
      tex_escape(vnesc, src);
      strcpy(targ, vnesc);
    }
}

static void tex_lagname (char *s, const DATAINFO *pdinfo, int v)
{
    const char *lbl = VARLABEL(pdinfo, v);
    int gotit = 0;

    if (strlen(lbl) > 2) {
      char myvar[24], tmp[9];
      int lag;

      lbl += 2;
      if (sscanf(lbl, "%8[^(](t - %d)", tmp, &lag) == 2) {
          tex_escape(myvar, tmp);
          sprintf(s, "%s$_{t-%d}$", myvar, lag);
          gotit = 1;
      }
    }
      
    if (!gotit) {
      tex_escape(s, pdinfo->varname[v]); 
    }
}

static void tex_vecm_varname (char *s, const DATAINFO *pdinfo, int v)
{
    const char *lbl = VARLABEL(pdinfo, v);
    int cvnum;
    int gotit = 0;

    if (sscanf(pdinfo->varname[v], "EC%d", &cvnum)) {
      sprintf(s, "EC%d$_{t-1}$", cvnum);
      gotit = 1;
    } else if (strlen(lbl) > 2) {
      char myvar[24], tmp[9];
      int lag;

      lbl += 2;
      if (sscanf(lbl, "d_%8[^(](t - %d)", tmp, &lag) == 2) {
          tex_escape(myvar, tmp);
          sprintf(s, "$\\Delta$%s$_{t-%d}$", myvar, lag);
          gotit = 1;
      }
    }

    if (!gotit) {
      tex_escape(s, pdinfo->varname[v]); 
    }
}

int tex_print_coeff (const DATAINFO *pdinfo, const MODEL *pmod, 
                 int i, PRN *prn)
{
    char tmp[24], coeff[64], sderr[64], tratio[64], pval[64];

    if (isnan(pmod->coeff[i]) || na(pmod->coeff[i])) {
      sprintf(coeff, "\\multicolumn{1}{c}{\\rm %s}", I_("undefined"));
    } else {
      tex_dcolumn_double(pmod->coeff[i], coeff);
    }

    if (isnan(pmod->sderr[i]) || na(pmod->sderr[i])) {
      sprintf(sderr, "\\multicolumn{1}{c}{\\rm %s}", I_("undefined"));
      sprintf(tratio, "\\multicolumn{1}{c}{\\rm %s}", I_("undefined"));
      sprintf(pval, "\\multicolumn{1}{c}{\\rm %s}", I_("undefined"));
    } else {
      tex_dcolumn_double(pmod->sderr[i], sderr);
      sprintf(tratio, "%.4f", pmod->coeff[i] / pmod->sderr[i]);
      sprintf(pval, "%.4f", coeff_pval(pmod, pmod->coeff[i] / pmod->sderr[i], 
                               pmod->dfd));
    }    

    *tmp = 0;
    if (pmod->aux == AUX_ARCH) {
      tex_make_cname(tmp, pdinfo->varname[pmod->list[i+2]]);
    } else if (pmod->ci == NLS) {
      if (!tex_greek_param(tmp, pmod->params[i+1])) {
          tex_escape(tmp, pmod->params[i+1]);
      }
    } else if (pmod->ci == ARMA) {
      tex_arma_coeff_name(tmp, pmod->params[i+1], 0);
    } else if (pmod->ci == GARCH) {
      tex_garch_coeff_name(tmp, pmod->params[i+1], 0);
    } else if (pmod->ci == VAR) {
      tex_lagname(tmp, pdinfo, pmod->list[i+2]);
    } else if (pmod->aux == AUX_VECM) {
      tex_vecm_varname(tmp, pdinfo, pmod->list[i+2]);
    } else {
      tex_escape(tmp, pdinfo->varname[pmod->list[i+2]]);
    }
      
    if (pmod->ci != LOGIT && pmod->ci != PROBIT) {
      pprintf(prn, "%s &\n"
            "  %s &\n"
            "    %s &\n"
            "      %s &\n"
            "        %s \\\\\n",  
            tmp,
            coeff,
            sderr,
            tratio,
            pval);      
    } else { 
      /* LOGIT, PROBIT */
      double *slopes = gretl_model_get_data(pmod, "slopes");
      char slope[32];

      if (pmod->list[i+2]) {
          tex_dcolumn_double(slopes[i], slope);
      }
      pprintf(prn, "%s &\n"
            "  %s &\n"
            "    %s &\n"
            "      %s &\n"
            "        %s \\\\\n",  
            tmp,
            coeff,
            sderr,
            tratio,
            (pmod->list[i+2])? slope : "");
    }

    return 0;
}

void tex_print_VECM_omega (GRETL_VAR *vecm, const DATAINFO *pdinfo, PRN *prn)
{
    char vname[32];
    const int *list = vecm->jinfo->list;
    double x;
    int i, j;

    pprintf(prn, "%s\n\n", I_("Cross-equation covariance matrix"));
    pputs(prn, "\\vspace{1em}\n");

    pputs(prn, "\\begin{tabular}{");
    pputs(prn, "l");
    for (i=0; i<vecm->neqns; i++) {
      pputs(prn, "r");
    }
    pputs(prn, "}\n & ");

    for (i=0; i<vecm->neqns; i++) {
      tex_escape(vname, pdinfo->varname[list[i+1]]);
      pprintf(prn, "$\\Delta$%s ", vname);
      if (i == vecm->neqns - 1) {
          pputs(prn, "\\\\\n");
      } else {
          pputs(prn, "& ");
      }
    }
    pputc(prn, '\n');

    for (i=0; i<vecm->neqns; i++) {
      tex_escape(vname, pdinfo->varname[list[i+1]]);
      pprintf(prn, "$\\Delta$%s & ", vname);
      for (j=0; j<vecm->neqns; j++) {
          x = gretl_matrix_get(vecm->S, i, j);
          tex_print_math_float(x, prn);
          if (j == vecm->neqns - 1) {
            pputs(prn, "\\\\\n");
          } else {
            pputs(prn, " & ");
          }
      }
    }

    pputs(prn, "\\end{tabular}\n\n");
    pputs(prn, "\\vspace{1em}\n");

    pputs(prn, "\\noindent\n");
    pprintf(prn, "%s = ", I_("determinant"));
    tex_print_math_float(exp(vecm->ldet), prn);
    pputs(prn, "\\\\\n");
}

void tex_print_VECM_coint_eqns (GRETL_VAR *vecm, const DATAINFO *pdinfo, PRN *prn)
{
    char s[16];
    JohansenInfo *jv = vecm->jinfo;
    int rows = gretl_matrix_rows(jv->Beta);
    int i, j;
    double x;

    pputs(prn, "\\noindent\n");
    pputs(prn, _("Cointegrating vectors"));
    if (jv->Bse != NULL) {
      pprintf(prn, " (%s)\n", _("standard errors in parentheses"));
    } 

    pputs(prn, "\n\\vspace{1em}\n");

    pputs(prn, "\\begin{tabular}{");
    pputs(prn, "l");
    for (i=0; i<jv->rank; i++) {
      pputs(prn, "r");
    }
    pputs(prn, "}\n");

    for (i=0; i<rows; i++) {
      if (i < jv->list[0]) {
          tex_escape(s, pdinfo->varname[jv->list[i+1]]);
          pprintf(prn, "%s$_{t-1}$ & ", s);
      } else if (jv->code == J_REST_CONST) {
          pputs(prn, "const & ");
      } else if (jv->code == J_REST_TREND) {
          pputs(prn, "trend & ");
      }

      /* coefficients */
      for (j=0; j<jv->rank; j++) {
          x = gretl_matrix_get(jv->Beta, i, j);
          if (jv->Bse == NULL) {
            x /= gretl_matrix_get(jv->Beta, j, j);
          }
          tex_print_signed_float(x, prn);
          if (j == jv->rank - 1) {
            pputs(prn, "\\\\\n");
          } else {
            pputs(prn, "& ");
          }     
      }

      if (jv->Bse != NULL) {
          /* standard errors */
          pputs(prn, " & ");
          for (j=0; j<jv->rank; j++) {
            if (i < jv->rank) {
                x = 0.0;
            } else {
                x = gretl_matrix_get(jv->Bse, i - jv->rank, j);
            }
            pputc(prn, '(');
            tex_print_float(x, prn);
            pputc(prn, ')');
            if (j == jv->rank - 1) {
                pputs(prn, "\\\\\n");
            } else {
                pputs(prn, "& ");
            }
          }
      }
    }

    pputs(prn, "\\end{tabular}\n\n\\vspace{1em}\n");
}

void tex_print_VAR_ll_stats (GRETL_VAR *var, PRN *prn)
{
    pprintf(prn, "\\noindent\n%s = ", I_("Log-likelihood"));
    tex_print_math_float(var->ll, prn);
    pputs(prn, "\\par\n");

    pprintf(prn, "\\noindent\n%s = ", I_("Determinant of covariance matrix"));
    tex_print_math_float(exp(var->ldet), prn);
    pputs(prn, "\\par\n");

    pprintf(prn, "\\noindent\n%s $= %.4f$ \\par\n", I_("AIC"), var->AIC);
    pprintf(prn, "\\noindent\n%s $= %.4f$ \\par\n", I_("BIC"), var->BIC);
}

static PRN *make_tex_prn (int ID, char *texfile,
                    int eqn, int doc)
{
    PrnFormat fmt = GRETL_FORMAT_TEX;
    PRN *prn;

    if (*texfile == '\0') {
      sprintf(texfile, "%s%s_%d.tex", gretl_user_dir(),
            (eqn)? "equation" : "model", ID);
    }

    prn = gretl_print_new_with_filename(texfile);
    if (prn != NULL) {
      if (eqn) {
          fmt |= GRETL_FORMAT_EQN;
      }
      if (doc) {
          fmt |= GRETL_FORMAT_DOC;
      }
      gretl_print_set_format(prn, fmt);
    }

    return prn;
}

/* mechanism for customizing gretl's tex preamble */

static char tex_preamble_file[MAXLEN];

#ifdef ENABLE_NLS
static const char *get_gretltex_local (void)
{
    static char localtex[16] = {0};
    char *lang = getenv("LANG");

    if (lang != NULL) {
      char lstr[3] = {0};

      strncat(lstr, lang, 2);
      sprintf(localtex, "gretlpre_%s.tex", lstr);
    }

    return localtex;
}
#endif

void set_gretl_tex_preamble (void)
{
    FILE *fp;
    const char *gretltex = "gretlpre.tex";
#ifdef ENABLE_NLS
    const char *localtex = get_gretltex_local();

    /* first choice: localized preamble file */
    sprintf(tex_preamble_file, "%s%s", gretl_user_dir(), localtex);
    fp = gretl_fopen(tex_preamble_file, "r");
    if (fp == NULL) {
      tex_preamble_file[0] = '\0';
    } else {
      fclose(fp);
      return;
    }    
#endif

    /* preamble file on disk */
    sprintf(tex_preamble_file, "%s%s", gretl_user_dir(), gretltex);
    fp = gretl_fopen(tex_preamble_file, "r");
    if (fp == NULL) {
      tex_preamble_file[0] = '\0';
    } else {
      fclose(fp);
    }
}

void gretl_tex_preamble (PRN *prn, int ams)
{
    FILE *fp = NULL;
    int userfile = 0;

    if (tex_preamble_file[0] != '\0') {
      fp = gretl_fopen(tex_preamble_file, "r");
      if (fp != NULL) {
          char line[128];

          while (fgets(line, sizeof line, fp)) {
            pputs(prn, line);
          }
          userfile = 1;
          fclose(fp);
      }
    }

    if (!userfile) {
      pputs(prn, "\\documentclass[11pt]{article}\n");

#ifdef ENABLE_NLS
      pputs(prn, "\\usepackage[latin1]{inputenc}\n\n");
#endif
      if (ams) {
          pputs(prn, "\\usepackage{amsmath}\n\n");
      } else {
          pputs(prn, "\\usepackage{dcolumn,longtable}\n\n");
      }

      pputs(prn, "\\begin{document}\n\n"
            "\\thispagestyle{empty}\n\n");
    }
}

#define MAXCOEFF 4

/**
 * tex_print_equation:
 * @pmod:  pointer to gretl MODEL struct.
 * @pdinfo:  information regarding the data set.
 * @standalone: print as full doc (1) or fragment (0).
 * @prn: gretl printing struct.
 *
 * Prints to @prn a gretl model in the form of a LaTeX equation, either as
 * a stand-alone document or as a fragment of LaTeX source for
 * insertion into a document.
 * 
 * Returns: 0 on successful completion.
 */

int tex_print_equation (const MODEL *pmod, const DATAINFO *pdinfo, 
                  int standalone, PRN *prn)
{
    double tstat;
    char tmp[48];
    int i, nc = pmod->ncoeff;
    int split = 0, offvar = 0;
    int cchars = 0, ccount = 0;

    if (pmod->ci == POISSON) {
      offvar = gretl_model_get_int(pmod, "offset_var");
      if (offvar > 0) {
          nc++;
      }
    }

    split = (nc > MAXCOEFF);

    if (standalone) {
      gretl_tex_preamble(prn, 1);
    } else{
      pputs(prn, "%%% the following needs the amsmath LaTeX package\n\n");
    }

    /* initial setup */
    pputs(prn, "\\begin{gather}\n");
    if (split) {
      pputs(prn, "\\begin{split}\n");
    }

    /* dependent variable */
    *tmp = '\0';
    if (pmod->ci == POISSON) {
      char vname[24];

      tex_escape(vname, pdinfo->varname[pmod->list[1]]);
      sprintf(tmp, "log(%s)", vname);
    } else if (pmod->ci == ARMA || pmod->ci == GARCH) {
      tex_escape(tmp, pdinfo->varname[pmod->list[4]]);
    } else {
      tex_escape(tmp, pdinfo->varname[pmod->list[1]]);
    }

    pprintf(prn, "\\widehat{\\rm %s} %s= \n", tmp, (split? "&" : ""));

    if (pmod->ci == GARCH) {
      nc -= (1 + pmod->list[1] + pmod->list[2]);
    }

    /* coefficients times indep vars */
    for (i=0; i<nc; i++) {
      if (offvar > 0 && i == nc - 1) {
          pputc(prn, '+');
          tex_print_float(1.0, prn);
      } else {
          tstat = pmod->coeff[i] / pmod->sderr[i];
          pprintf(prn, "%s\\underset{(%.3f)}{", 
                (pmod->coeff[i] < 0.0)? "-" :
                (i > 0)? "+" : "", tstat);
          tex_print_float(pmod->coeff[i], prn);
          pputc(prn, '}');
      }
      if (i > 0 || pmod->ifc == 0) {
          pputs(prn, "\\,");
          if (pmod->ci == ARMA) {
            cchars += strlen(pmod->params[i+1]);
            tex_arma_coeff_name(tmp, pmod->params[i+1], 1);
            pputs(prn, tmp);
          } else if (pmod->ci == GARCH) {
            cchars += strlen(pmod->params[i+1]);
            tex_garch_coeff_name(tmp, pmod->params[i+1], 1);
            pputs(prn, tmp);
          } else if (offvar > 0 && i == nc - 1) {
            cchars += strlen(pdinfo->varname[offvar]);
            tex_escape(tmp, pdinfo->varname[offvar]);
            pprintf(prn, "\\mbox{%s}", tmp);
          } else {
            cchars += strlen(pdinfo->varname[pmod->list[i+2]]);
            tex_escape(tmp, pdinfo->varname[pmod->list[i+2]]);
            pprintf(prn, "\\mbox{%s}", tmp);
          }
      }
      ccount++;
      if (split && (cchars > 30 || ccount > 3)) {
          pputs(prn, "\\\\\n& ");
          cchars = ccount = 0;
      } else {
          pputc(prn, '\n');
      }
    }

    if (split) {
      pputs(prn, "\\end{split}\n");
    }

    pputs(prn, " \\notag \\\\\n");

    if (pmod->ci == GARCH) {
      int q = pmod->list[1];
      int p = pmod->list[2];
      int r = pmod->list[0] - 4;

      tstat = pmod->coeff[r] / pmod->sderr[r];

      pprintf(prn, "\\hat{\\sigma}^2_t = \\underset{(%.3f)}{%g} ", 
            tstat, pmod->coeff[r]);

      for (i=1; i<=q; i++) {
          tstat = pmod->coeff[r+i] / pmod->sderr[r+i];
          pprintf(prn, "%s\\underset{(%.3f)}{", 
                (pmod->coeff[r+i] < 0.0)? "-" : "+", tstat);
          tex_print_float(pmod->coeff[r+i], prn);
          pputs(prn, "}\\,");
          pprintf(prn, "\\varepsilon^2_{t-%d}", i);
      }

      for (i=1; i<=p; i++) {
          tstat = pmod->coeff[q+r+i] / pmod->sderr[q+r+i];
          pprintf(prn, "%s\\underset{(%.3f)}{", 
                (pmod->coeff[q+r+i] < 0.0)? "-" : "+", tstat);
          tex_print_float(pmod->coeff[q+r+i], prn);
          pputs(prn, "}\\,");
          pprintf(prn, "\\sigma^2_{t-%d}", i);
      }

      pputs(prn, "\\notag \\\\\n");
    }     

    /* additional info (R^2 etc) */
    if (pmod->ci == LAD) { 
      sprintf(tmp, "%g", pmod->rho);
      tex_modify_exponent(tmp);
      pprintf(prn, "T = %d \\quad \\sum |\\hat{u}_t| = %s",
            pmod->nobs, tmp);
    } else {
      if (!na(pmod->adjrsq)) {
          pprintf(prn, "T = %d \\quad \\bar{R}^2 = %.4f ",
                pmod->nobs, pmod->adjrsq);
      } else if (!na(pmod->lnL)) {
          pprintf(prn, "T = %d \\quad \\mbox{ln}L = %.4f ",
                pmod->nobs, pmod->lnL);
      }

      if (pmod->ci != LOGIT && pmod->ci != PROBIT && !na(pmod->fstt)) {
          sprintf(tmp, "%.5g", pmod->fstt);
          tex_modify_exponent(tmp);
          pprintf(prn, "\\quad F(%d,%d) = %s ", 
                pmod->dfn, pmod->dfd, tmp);
      }

      if (!na(pmod->sigma)) {
          sprintf(tmp, "%.5g", pmod->sigma);
          tex_modify_exponent(tmp);
          pprintf(prn, "\\quad \\hat{\\sigma} = %s", tmp);
      }

      if (!na(gretl_model_get_double(pmod, "rho_in"))) {
          double r = gretl_model_get_double(pmod, "rho_in");

          sprintf(tmp, "%.5g", r);
          tex_modify_exponent(tmp);
          pprintf(prn, " \\quad \\rho = %s", tmp);
      }
    }

    pputs(prn, "\\notag \\\\\n");
    pprintf(prn, "\\centerline{(%s)} \\notag\n",
        I_("$t$-statistics in parentheses"));
    pputs(prn, "\\end{gather}\n");

    if (standalone) {
      pputs(prn, "\n\\end{document}\n");
    }

    return 0;
}

/**
 * tex_print_model:
 * @pmod:  pointer to gretl MODEL struct.
 * @pdinfo: information regarding the data set.
 * @prn: gretl printing struct.
 *
 * Prints to @prn a gretl model in the form of either a LaTeX 
 * table or an equation, and either as a stand-alone document or 
 * as a fragment of LaTeX source for insertion into a document.
 *
 * The options are read from the format field of @prn --
 * gretl_print_set_format().
 * 
 * Returns: 0 on successful completion.
 */

int tex_print_model (MODEL *pmod, const DATAINFO *pdinfo, PRN *prn)
{
    int docopt = tex_doc_format(prn);
    int ret;

    if (tex_eqn_format(prn)) { 
      ret = tex_print_equation(pmod, pdinfo, docopt, prn);
    } else {
      ret = printmodel(pmod, pdinfo, OPT_NONE, prn);
    }

    return ret;
}

/**
 * texprint:
 * @pmod: pointer to model.
 * @pdinfo: information regarding the data set.
 * @texfile: name of file to save.
 * @opt: if opt & %OPT_O, complete doc, else fragment;
 * if opt & %OPT_E print as equation, otherwise use tabular
 * format.
 *
 * Prints to file a gretl model in the form of a LaTeX table or
 * equation, either as a stand-alone document or as a fragment 
 * of LaTeX source for insertion into a document.
 * 
 * Returns: 0 on successful completion, 1 on error.
 */

int texprint (MODEL *pmod, const DATAINFO *pdinfo,
            char *texfile, gretlopt opt)
{
    PRN *prn;
    int eqn = (opt & OPT_E);
    int doc = (opt & OPT_O);
    int err = 0;

    prn = make_tex_prn(pmod->ID, texfile, eqn, doc);
    if (prn == NULL) {
      err = 1;
    } else {
      err = tex_print_model(pmod, pdinfo, prn);
      gretl_print_destroy(prn);
    }

    return err;
}

/**
 * tex_print_obs_marker:
 * @t: observation number.
 * @pdinfo: data information struct.
 * @prn: gretl printing struct.
 *
 * Print a string (label, date or obs number) representing the given @t.
 */

void tex_print_obs_marker (int t, const DATAINFO *pdinfo, PRN *prn)
{
    if (pdinfo->markers) { 
      pprintf(prn, "\\texttt{%s} ", pdinfo->S[t]); 
    } else {
      char tmp[OBSLEN]; 

      ntodate(tmp, t, pdinfo);
      pprintf(prn, "%8s ", tmp);
    }
}

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