Average Library

This is a collection of routines for performing mathematical analysis of arrays of numbers.

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Current function support:

• Rolling average
• Mean
• Mode
• Minimum
• Maximum
• Standard Deviation

All the functions are fully overloaded to support the following data types:

• char
• unsigned char
• int
• unsigned int
• long
• unsigned long
• float

With the exception of stddev() they all return the same data type as the array. An array of int values returns a single int. stddev() always returns a float.

All the functions except rollingAverage() take two arguments. The first is the array to work on. The second is the number of entries in the array. rollingAverage() takes a third argument - the new entry to add to the array.

Rolling average

Format: average = rollingAverage(history_array, slice_count, value);

Adds value to the array history_array shifting all the values down one place. The mean average is then returned.

Mean

Format: average = mean(array, slice_count);

Calculates the mean average of the values in array. slice_count is the number of entries in the array.

Mode

Format: average = mode(array,slice_count);

Finds the most common number in the array.

Maximum

Format: max = maximum(array,slice_count);

Finds the largest value in the array.

Minimum

Format: min = minimum(array,slice_count);

Finds the smallest value in the array.

Standard Deviation

Format: deviation = stddev(array,slice_count);

The standard deviation is the square root of the mean of the sum of the squares of the difference between each data point and the array mean average.

This is the only function which does not return the same data type as the array. The standard deviation is always returned as a float.

Example:

#include <Average.h>

#define CNT 600
int d[CNT];

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  int i;

  for(i=0; i<CNT; i++)
  {
    d[i] = random(500);
  }  

  Serial.print("Mean: ");
  Serial.print(mean(d,CNT),DEC);
  Serial.print(" Mode: ");
  Serial.print(mode(d,CNT),DEC);
  Serial.print(" Max: ");
  Serial.print(maximum(d,CNT),DEC);
  Serial.print(" Min: ");
  Serial.print(minimum(d,CNT),DEC);
  Serial.print(" Standard deviation: ");
  Serial.print(stddev(d,CNT),4);
  Serial.println("");
  Serial.println("");

  delay(5000);
}