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/*
This file is part of GNUnet
Copyright (C) 2008--2013 GNUnet e.V.
GNUnet is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
GNUnet 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
Affero General Public License for more details.
*/
/**
* @file testbed/testbed_api_sd.h
* @brief functions to calculate standard deviation
* @author Sree Harsha Totakura <sreeharsha@totakura.in>
*/
#ifndef TESTBED_API_SD_H
#define TESTBED_API_SD_H
/**
* Opaque handle for calculating SD
*/
struct SDHandle;
/**
* Initialize standard deviation calculation handle
*
* @param max_cnt the maximum number of readings to keep
* @return the initialized handle
*/
struct SDHandle *
GNUNET_TESTBED_SD_init_ (unsigned int max_cnt);
/**
* Frees the memory allocated to the SD handle
*
* @param h the SD handle
*/
void
GNUNET_TESTBED_SD_destroy_ (struct SDHandle *h);
/**
* Add a reading to SD
*
* @param h the SD handle
* @param amount the reading value
*/
void
GNUNET_TESTBED_SD_add_data_ (struct SDHandle *h, unsigned int amount);
/**
* Returns the factor by which the given amount differs from the standard deviation
*
* @param h the SDhandle
* @param amount the value for which the deviation is returned
* @param factor the factor by which the given amont differs
* @return the deviation from the average; GNUNET_SYSERR if the deviation cannot
* be calculated OR 0 if the deviation is less than the average; a
* maximum of 4 is returned for deviations equal to or larger than 4
*/
int
GNUNET_TESTBED_SD_deviation_factor_ (struct SDHandle *h, unsigned int amount,
int *factor);
#endif
/* end of testbed_api.h */
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