/**
   This class collects a number of values and counts the peaks and valleys.
*/
public class DataSet
{
   private double lastValue;
   private int wasCanidate;
   private double precedingValue;
   private int count;
   public int peaks;
   public int valleys;

   /**
      Constructs a new data set with no data.
   */
   public DataSet()
   {
      lastValue = 0;
      wasCanidate = 0;
      precedingValue = 0;
      count = 0;
      peaks = 0;
      valleys = 0;
   }

   /**
      Adds a value to this data set.
      @param valueToAdd the value to add to this data set
   */
   public void add(double valueToAdd)
   {
      if(count == 0){lastValue = valueToAdd; count++; return;}
      else if(valueToAdd < lastValue && precedingValue < lastValue)
      {
         peaks++;
         precedingValue = lastValue;
         lastValue = valueToAdd;
         count++;
         return;
      }
      else if(valueToAdd > lastValue && precedingValue > lastValue)
      {
         valleys++;
         precedingValue = lastValue;
         lastValue = valueToAdd;
         count++;
         return;
      }
      precedingValue = lastValue;
      lastValue = valueToAdd;
   }

   /**
      Gets the number of peaks in this data set.
      @return the number of peaks in this data set
   */
   public int getPeakCount()
   {
      return peaks;
   }

   /**
      Gets the number of valleys in this data set.
      @return the number of valleys in this data set
   */
   public int getValleyCount()
   {
      return valleys;
   }
}