84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
/** Histogram functions.
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*
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* @file
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2015, Steffen Vogel
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* @license GPLv3
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*********************************************************************************/
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#ifndef _HIST_H_
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#define _HIST_H_
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#include <stdio.h>
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#define HIST_HEIGHT 75
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#define HIST_SEQ 17
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typedef unsigned hist_cnt_t;
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/** Histogram structure used to collect statistics. */
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struct hist {
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/** The distance between two adjacent buckets. */
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double resolution;
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/** The value of the highest bucket. */
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double high;
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/** The value of the lowest bucket. */
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double low;
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/** The highest value observed (may be higher than #high). */
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double highest;
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/** The lowest value observed (may be lower than #low). */
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double lowest;
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/** The number of buckets in #data. */
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int length;
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/** Total number of counted values between #low and #high. */
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hist_cnt_t total;
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/** The number of values which are higher than #high. */
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hist_cnt_t higher;
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/** The number of values which are lower than #low. */
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hist_cnt_t lower;
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/** Pointer to dynamically allocated array of size length. */
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hist_cnt_t *data;
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/** Private variables for online variance calculation */
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double _m[2], _s[2];
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};
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/** Initialize struct hist with supplied values and allocate memory for buckets. */
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void hist_create(struct hist *h, double start, double end, double resolution);
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/** Free the dynamically allocated memory. */
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void hist_destroy(struct hist *h);
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/** Reset all counters and values back to zero. */
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void hist_reset(struct hist *h);
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/** Count a value within its corresponding bucket. */
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void hist_put(struct hist *h, double value);
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/** Calcluate the variance of all counted values. */
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double hist_var(struct hist *h);
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/** Calculate the mean average of all counted values. */
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double hist_mean(struct hist *h);
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/** Calculate the standard derivation of all counted values. */
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double hist_stddev(struct hist *h);
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/** Print all statistical properties of distribution including a graphilcal plot of the histogram. */
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void hist_print(struct hist *h);
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/** Print ASCII style plot of histogram */
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void hist_plot(struct hist *h);
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/** Dump histogram data in Matlab format to buf */
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void hist_dump(struct hist *h, char *buf, int len);
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/** Prints Matlab struct containing all infos to file. */
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void hist_matlab(struct hist *h, FILE *f);
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#endif /* _HIST_H_ */
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