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/* histogram/ntuple.c
*
* Copyright (C) 2000 Simone Piccardi
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* Jan/2001 Modified by Brian Gough. Minor changes for GSL */
#include <config.h>
#include <errno.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_ntuple.h>
/*
* gsl_ntuple_open:
* Initialize an ntuple structure and create the related file
*/
gsl_ntuple *
gsl_ntuple_create (char *filename, void *ntuple_data, size_t size)
{
gsl_ntuple *ntuple = (gsl_ntuple *)malloc (sizeof (gsl_ntuple));
if (ntuple == 0)
{
GSL_ERROR_VAL ("failed to allocate space for ntuple struct",
GSL_ENOMEM, 0);
}
ntuple->ntuple_data = ntuple_data;
ntuple->size = size;
ntuple->file = fopen (filename, "wb");
if (ntuple->file == 0)
{
free (ntuple);
GSL_ERROR_VAL ("unable to create ntuple file", GSL_EFAILED, 0);
}
return ntuple;
}
/*
* gsl_ntuple_open:
* Initialize an ntuple structure and open the related file
*/
gsl_ntuple *
gsl_ntuple_open (char *filename, void *ntuple_data, size_t size)
{
gsl_ntuple *ntuple = (gsl_ntuple *)malloc (sizeof (gsl_ntuple));
if (ntuple == 0)
{
GSL_ERROR_VAL ("failed to allocate space for ntuple struct",
GSL_ENOMEM, 0);
}
ntuple->ntuple_data = ntuple_data;
ntuple->size = size;
ntuple->file = fopen (filename, "rb");
if (ntuple->file == 0)
{
free (ntuple);
GSL_ERROR_VAL ("unable to open ntuple file for reading",
GSL_EFAILED, 0);
}
return ntuple;
}
/*
* gsl_ntuple_write:
* write to file a data row, must be used in a loop!
*/
int
gsl_ntuple_write (gsl_ntuple * ntuple)
{
size_t nwrite;
nwrite = fwrite (ntuple->ntuple_data, ntuple->size,
1, ntuple->file);
if (nwrite != 1)
{
GSL_ERROR ("failed to write ntuple entry to file", GSL_EFAILED);
}
return GSL_SUCCESS;
}
/* the following function is a synonym for gsl_ntuple_write */
int
gsl_ntuple_bookdata (gsl_ntuple * ntuple)
{
return gsl_ntuple_write (ntuple);
}
/*
* gsl_ntuple_read:
* read form file a data row, must be used in a loop!
*/
int
gsl_ntuple_read (gsl_ntuple * ntuple)
{
size_t nread;
nread = fread (ntuple->ntuple_data, ntuple->size, 1, ntuple->file);
if (nread == 0 && feof(ntuple->file))
{
return GSL_EOF;
}
if (nread != 1)
{
GSL_ERROR ("failed to read ntuple entry from file", GSL_EFAILED);
}
return GSL_SUCCESS;
}
/*
* gsl_ntuple_project:
* fill an histogram with an ntuple file contents, use
* SelVal and SelFunc user defined functions to get
* the value to book and the selection funtion
*/
#define EVAL(f,x) ((*((f)->function))(x,(f)->params))
int
gsl_ntuple_project (gsl_histogram * h, gsl_ntuple * ntuple,
gsl_ntuple_value_fn * value_func,
gsl_ntuple_select_fn * select_func)
{
size_t nread;
do
{
nread = fread (ntuple->ntuple_data, ntuple->size,
1, ntuple->file);
if (nread == 0 && feof(ntuple->file))
{
break ;
}
if (nread != 1)
{
GSL_ERROR ("failed to read ntuple for projection", GSL_EFAILED);
}
if (EVAL(select_func, ntuple->ntuple_data))
{
gsl_histogram_increment (h, EVAL(value_func, ntuple->ntuple_data));
}
}
while (1);
return GSL_SUCCESS;
}
/*
* gsl_ntuple_close:
* close the ntuple file and free the memory
*/
int
gsl_ntuple_close (gsl_ntuple * ntuple)
{
int status = fclose (ntuple->file);
if (status)
{
GSL_ERROR ("failed to close ntuple file", GSL_EFAILED);
}
free (ntuple);
return GSL_SUCCESS;
}
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