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22 * @file testbed/testbed_api_sd.h
23 * @brief functions to calculate standard deviation
24 * @author Sree Harsha Totakura <sreeharsha@totakura.in>
27 #ifndef TESTBED_API_SD_H
28 #define TESTBED_API_SD_H
32 * Opaque handle for calculating SD
38 * Initialize standard deviation calculation handle
40 * @param max_cnt the maximum number of readings to keep
41 * @return the initialized handle
44 GNUNET_TESTBED_SD_init_ (unsigned int max_cnt);
48 * Frees the memory allocated to the SD handle
50 * @param h the SD handle
53 GNUNET_TESTBED_SD_destroy_ (struct SDHandle *h);
59 * @param h the SD handle
60 * @param amount the reading value
63 GNUNET_TESTBED_SD_add_data_ (struct SDHandle *h, unsigned int amount);
67 * Returns the factor by which the given amount differs from the standard deviation
69 * @param h the SDhandle
70 * @param amount the value for which the deviation is returned
71 * @param factor the factor by which the given amont differs
72 * @return the deviation from the average; GNUNET_SYSERR if the deviation cannot
73 * be calculated OR 0 if the deviation is less than the average; a
74 * maximum of 4 is returned for deviations equal to or larger than 4
77 GNUNET_TESTBED_SD_deviation_factor_ (struct SDHandle *h, unsigned int amount,
81 /* end of testbed_api.h */