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Peter W. Draper authoredPeter W. Draper authored
histogram.h 1.65 KiB
/*******************************************************************************
* This file is part of SWIFT.
* Copyright (c) 2021 Peter W. Draper (p.w.draper@durham.ac.uk)
*
* This program 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 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
******************************************************************************/
#ifndef SWIFT_HISTOGRAM_H
#define SWIFT_HISTOGRAM_H
/* Bins in a histogram. Note this must be an even number. */
#define NHIST 65536
/** Histogram structure. */
struct histogram {
/* Raw histogram. NHIST counts in hist and the value associated with a bin
* is index*width+zero. */
double width;
double zero;
int hist[NHIST];
/* Normalized cumulative histogram. Empty bins are joined into a larger one,
* so values are the bin centre, sums the sum to that bin and nvalues the
* number of bins that have been populated, can be less than NHIST. */
double values[NHIST];
double sums[NHIST];
int nvalues;
};
int histread(const char *file, double **values, int *nvalues);
void histmake(int nvalues, double *values, struct histogram *h);
#endif