Gathering Mean and StDev from multiple inputs at once

Projects Programming
4

For future reference, here is how I did it. Once you have the statistics library added it is very simple.

#include "Statistic.h"  // without trailing s

Statistic a0;
Statistic a1; 
Statistic a2;
Statistic a3;
Statistic a4;
Statistic a5;
Statistic a6;
Statistic a7;
const int flipCount = 10000;

void setup(void) 
{
  Serial.begin(9600);
  void clear(); //explicitly start clean
  Serial.print ("time(s) ");
  Serial.print ("a0AVG ");
  Serial.print ("a1AVG ");
  Serial.print ("a2AVG ");
  Serial.print ("a3AVG ");
  Serial.print ("a4AVG ");
  Serial.print ("a5AVG ");
  Serial.print ("a6AVG ");
  Serial.print ("a7AVG ");  

  Serial.print ("a0StDev ");
  Serial.print ("a1StDev ");
  Serial.print ("a2StDev ");
  Serial.print ("a3StDev ");
  Serial.print ("a4StDev ");
  Serial.print ("a5StDev ");
  Serial.print ("a6StDev ");
  Serial.println ("a7StDev "); 
}

void loop(void) 
{
//measure voltage for each pin
  float vA0 = analogRead(A0) * (5.0 / 1023.0);
  float vA1 = analogRead(A1) * (5.0 / 1023.0);
  float vA2 = analogRead(A2) * (5.0 / 1023.0);
  float vA3 = analogRead(A3) * (5.0 / 1023.0);
  float vA4 = analogRead(A4) * (5.0 / 1023.0);
  float vA5 = analogRead(A5) * (5.0 / 1023.0);
  float vA6 = analogRead(A6) * (5.0 / 1023.0);
  float vA7 = analogRead(A7) * (5.0 / 1023.0);
  
 //add measured voltage to database for each pin
  a0.add(vA0);
  a1.add(vA1);
  a2.add(vA2);
  a3.add(vA3);
  a4.add(vA4);
  a5.add(vA5);
  a6.add(vA6);
  a7.add(vA7); 
  //delay (1);
 

  if (a0.count() == flipCount)
  {
  Serial.print (millis()/1000); Serial.print(" ");
  Serial.print(a0.average(), 4); Serial.print(" ");
  Serial.print(a1.average(), 4); Serial.print(" ");
  Serial.print(a2.average(), 4); Serial.print(" ");
  Serial.print(a3.average(), 4); Serial.print(" ");
  Serial.print(a4.average(), 4); Serial.print(" ");
  Serial.print(a5.average(), 4); Serial.print(" ");
  Serial.print(a6.average(), 4); Serial.print(" ");
  Serial.print(a7.average(), 4); Serial.print(" ");
   
  Serial.print(a0.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a1.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a2.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a3.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a4.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a5.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a6.pop_stdev(), 4); Serial.print(" ");
  Serial.print(a7.pop_stdev(), 4); Serial.print(" ");
  
  Serial.println();
  a0.clear();
  a1.clear();
  a2.clear();
  a3.clear();
  a4.clear();
  a5.clear();
  a6.clear();
  a7.clear();
  }
}