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94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
#pragma once
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//
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// FILE: RunningMedian.h
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// AUTHOR: Rob Tillaart
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// PURPOSE: RunningMedian library for Arduino
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// VERSION: 0.3.3
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// URL: https://github.com/RobTillaart/RunningMedian
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// URL: http://arduino.cc/playground/Main/RunningMedian
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// HISTORY: See RunningMedian.cpp
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//
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#include "Arduino.h"
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#define RUNNING_MEDIAN_VERSION (F("0.3.3"))
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// fall back to fixed storage for dynamic version => remove true
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#define RUNNING_MEDIAN_USE_MALLOC true
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// MEDIAN_MIN_SIZE should at least be 3 to be practical,
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#define MEDIAN_MIN_SIZE 3
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#ifdef RUNNING_MEDIAN_USE_MALLOC
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// max 250 to not overflow uint8_t internal vars
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#define MEDIAN_MAX_SIZE 255
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#else
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// using fixed memory will be limited to 19 elements.
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#define MEDIAN_MAX_SIZE 19
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#endif
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class RunningMedian
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{
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public:
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// # elements in the internal buffer
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// odd sizes results in a 'real' middle element and will be a bit faster.
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// even sizes takes the average of the two middle elements as median
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explicit RunningMedian(const uint8_t size);
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~RunningMedian();
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// resets internal buffer and var
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void clear();
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// adds a new value to internal buffer, optionally replacing the oldest element.
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void add(const float value);
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// returns the median == middle element
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float getMedian();
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// returns the Quantile
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float getQuantile(const float q);
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// returns average of the values in the internal buffer
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float getAverage();
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// returns average of the middle nMedian values, removes noise from outliers
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float getAverage(uint8_t nMedian);
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float getHighest() { return getSortedElement(_count - 1); };
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float getLowest() { return getSortedElement(0); };
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// get n'th element from the values in time order
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float getElement(const uint8_t n);
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// get n'th element from the values in size order
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float getSortedElement(const uint8_t n);
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// predict the max change of median after n additions
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float predict(const uint8_t n);
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uint8_t getSize() { return _size; };
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// returns current used elements, getCount() <= getSize()
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uint8_t getCount() { return _count; };
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bool isFull() { return (_count == _size); }
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protected:
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boolean _sorted; // _sortIdx{} is up to date
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uint8_t _size; // max number of values
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uint8_t _count; // current number of values
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uint8_t _index; // next index to add.
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// _values holds the elements themself
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// _p holds the index for sorted
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#ifdef RUNNING_MEDIAN_USE_MALLOC
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float * _values;
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uint8_t * _sortIdx;
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#else
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float _values[MEDIAN_MAX_SIZE];
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uint8_t _p[MEDIAN_MAX_SIZE];
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#endif
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void sort();
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};
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// END OF FILE
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