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/*****************************************************************************
* *
* UNURAN -- Universal Non-Uniform Random number generator *
* *
*****************************************************************************
* *
* FILE: test_functionparser *
* *
* Compare evaluation result of function parser with those of *
* Mathematica(TM) *
* *
* *
*****************************************************************************
* *
* Copyright (c) 2000-2006 Wolfgang Hoermann and Josef Leydold *
* Department of Statistics and Mathematics, WU Wien, Austria *
* *
* 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., *
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA *
* *
*****************************************************************************/
/*---------------------------------------------------------------------------*/
/* #define DEBUG 1 */
/*---------------------------------------------------------------------------*/
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <config.h>
#include <unuran.h>
/* macros and functions for handling floats */
#include <src/utils/unur_fp_source.h>
#include <src/utils/unur_fp_const_source.h>
/*---------------------------------------------------------------------------*/
/* name of data file */
static const char datafile[] = "t_functionparser.data";
/* number of failed tests */
static int n_failed = 0;
/* file handles */
FILE *DATA; /* file with data */
FILE *UNURANLOG; /* unuran log file */
FILE *TESTLOG; /* test log file */
/*---------------------------------------------------------------------------*/
static int _unur_test_function (void);
/*---------------------------------------------------------------------------*/
int main(void)
{
/* open log file for unuran and set output stream for unuran messages */
if ( (UNURANLOG = fopen( "t_functionparser_unuran.log","w" )) == NULL )
exit (EXIT_FAILURE);
unur_set_stream( UNURANLOG );
/* open log file for testing */
if ( (TESTLOG = fopen( "t_functionparser_test.log","w" )) == NULL )
exit (EXIT_FAILURE);
/* write header into log file */
{
time_t started;
fprintf(TESTLOG,"\nUNU.RAN - Universal Non-Uniform RANdom number generator\n\n");
if (time( &started ) != -1)
fprintf(TESTLOG,"%s",ctime(&started));
fprintf(TESTLOG,"\n=======================================================\n\n");
/* fprintf(TESTLOG,"(Search for string \"data\" to find new section.)\n\n"); */
}
/* open data file */
if ( (DATA = fopen( datafile,"r" )) == NULL ) {
printf("ERROR: could not open file %s \n", datafile);
fprintf(TESTLOG,"ERROR: could not open file %s \n", datafile);
exit (77); /* ignore this error */
}
while (_unur_test_function()==TRUE);
/* close files */
fclose (UNURANLOG);
fclose (TESTLOG);
fclose (DATA);
/* end */
if (n_failed > 0) {
printf("[function parser --> failed]\n");
exit (EXIT_FAILURE);
}
else {
printf("[function parser --> ok]\n");
exit (EXIT_SUCCESS);
}
} /* end of main() */
/*---------------------------------------------------------------------------*/
int
_unur_test_function (void)
{
#define BUFSIZE 1024 /* size of line buffer */
char buffer[BUFSIZE]; /* buffer for reading line */
char *ptr_buffer; /* pointer into buffer */
char fstr[BUFSIZE]; /* function string */
double x; /* argument x */
double fx_exp, dfx_exp; /* expected values for f(x) and f'(x) */
double fx_obs, dfx_obs; /* observed values for f(x) and f'(x) */
double fx_rep, dfx_rep; /* observed values for f(x) and f'(x)
for reparsed string */
double diff;
char *repstr = NULL; /* string generated from parsed tree */
UNUR_DISTR *distr, *rep;
int failed = 0;
/* find next function string */
while (1) {
/* read next line */
fgets(buffer, BUFSIZE, DATA);
if (feof(DATA)) return FALSE;
if (strncmp(buffer,"function=",8)==0) break;
}
/* get function string */
strcpy( fstr, buffer+9 );
/* remove newline character */
fstr[strlen(fstr)-1] = '\0';
/* print info into log file */
fprintf(TESTLOG,"function = \"%s\"\n", fstr);
/* make distribution object with given function as PDF */
distr = unur_distr_cont_new();
if (unur_distr_cont_set_pdfstr(distr,fstr)!=UNUR_SUCCESS) {
printf("ERROR: syntax error in \"%s\"\n", fstr);
fprintf(TESTLOG,"ERROR: syntax error in \"%s\"\n", fstr);
exit (EXIT_FAILURE);
}
/* reparse function string and make duplicate distribution object */
repstr = unur_distr_cont_get_pdfstr(distr);
fprintf(TESTLOG,"parsed = \"%s\"\n", repstr);
rep = unur_distr_cont_new();
if (unur_distr_cont_set_pdfstr(rep,repstr)!=UNUR_SUCCESS) {
printf("ERROR: syntax error in \"%s\"\n", repstr);
fprintf(TESTLOG,"ERROR: syntax error in reparsed string \"%s\"\n", repstr);
exit (EXIT_FAILURE);
}
/* read all the data */
while (1) {
/* read next line */
fgets(buffer, BUFSIZE, DATA);
if (feof(DATA)) break;
/* stop if blank line */
if (isspace(buffer[0]))
break;
/* read x and expected values for f(x) and f'(x) */
ptr_buffer = buffer;
x = strtod( ptr_buffer, &ptr_buffer );
fx_exp = strtod( ptr_buffer, &ptr_buffer );
dfx_exp = strtod( ptr_buffer, &ptr_buffer );
/* compute function values for function tree */
fx_obs = unur_distr_cont_eval_pdf(x,distr);
dfx_obs = unur_distr_cont_eval_dpdf(x,distr);
/* compute function values for reparsed function tree */
fx_rep = unur_distr_cont_eval_pdf(x,rep);
dfx_rep = unur_distr_cont_eval_dpdf(x,rep);
/* compare */
if (!(_unur_FP_approx(fx_exp,fx_obs))) {
++failed;
diff = fx_obs - fx_exp;
fprintf(TESTLOG,"[fx]\tx = %g:\t(exp) = %g\t(obs) = %g\tdiff = %g --> error\n",
x,fx_exp,fx_obs,diff);
}
if (!(_unur_FP_approx(fx_obs,fx_rep))) {
++failed;
diff = fx_rep - fx_obs;
fprintf(TESTLOG,"[fx]\tx = %g:\t(obs) = %g\t(rep) = %g\tdiff = %g --> error\n",
x,fx_obs,fx_rep,diff);
}
if (!(_unur_FP_approx(dfx_exp,dfx_obs))) {
++failed;
diff = dfx_obs - dfx_exp;
fprintf(TESTLOG,"[dfx]\tx = %g:\t(exp) = %g\t(obs) = %g\tdiff = %g --> error\n",
x,dfx_exp,dfx_obs,diff);
}
if (!(_unur_FP_approx(dfx_obs,dfx_rep))) {
++failed;
diff = dfx_rep - dfx_obs;
fprintf(TESTLOG,"[dfx]\tx = %g:\t(obs) = %g\t(rep) = %g\tdiff = %g --> error\n",
x,dfx_obs,dfx_rep,diff);
}
}
/* free memory */
unur_distr_free(distr);
unur_distr_free(rep);
if (repstr) free(repstr);
/* write result */
if (failed) {
fprintf(TESTLOG,"\t--> FAILED\n\n");
++n_failed;
}
else {
fprintf(TESTLOG,"\t--> OK\n\n");
}
return TRUE;
#undef BUFSIZE
} /* end of _unur_test_function() */
/*---------------------------------------------------------------------------*/
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