Arduino colde help needed!!

int heart_high, heart_low;
int data[200], i, mapped;
void setup(){
  for(i=2; i<12; i++)//LEDs
    pinMode(i, OUTPUT);
  Serial.begin(115200);//for the processing sketch

}//setup


void loop(){

  heart_high=0;//reset the high before we look for it,  everything is higher than 0
  heart_low = 1023;//reset the low before we look for it, everything is lower than 1023

  for(i=200; i>0; i--){              //search for the low and high out of the last 200 samples
             data[i] = data[i-1];    // move everything back one, this will leave data[0] empty, but we put the next read there after this

        if(data[i]>heart_high)      //check to see if we have something higher than the current high
             
             heart_high=data[i];    //if it is higher, write the new value in
        
        if(data[i]<heart_low)       //same idea as the high check
                    
             heart_low=data[i];
  }//for loop

  data[0] = analogRead(0);    //now write the next analog value to data[0]

  mapped = map(data[0], 0, 1023, 0, 600);
  
  Serial.println(mapped);     //send over the current value to the processing sketch, but scale it to match the screen height

  delay(5);                   //delay in here is important, we need enough samples to catch an entire waveform, so at least 1 sec of samples should be tored in data[0], 
                              //so 5ms x 200 = 1000, we're good


  //This code is where we control the LEDs
  
  if((heart_high-heart_low)>150){       //first, don't even go in here unless the span of the high and low is greater than 150.  This is important, so the LEDs don't go crazy 
    //if you're flat lined

    //I'll explain how one of these works
    //There is an 'if' check for each of the LEDs
    //Basically, how this works is we want the LEDs turn represent the entire span of a heart beat, which is why we get the lowest and highest value
    //this gives us the span, which can be used to take a percentage of, and that's exactly how all these statements work
    
    if(data[0] > (heart_high-.95*(heart_high-heart_low)))    //this is true if the read is greater than 95% of the span
      digitalWrite(2, HIGH);
    else
      digitalWrite(2,LOW); 

    if(data[0] > (heart_high-.9*(heart_high-heart_low)))     // greater than 90% of the span and so on
      digitalWrite(3, HIGH);
    else
      digitalWrite(3,LOW); 

    if(data[0] > (heart_high-.8*(heart_high-heart_low)))
      digitalWrite(4, HIGH);
    else
      digitalWrite(4,LOW); 
    if(data[0] > (heart_high-.7*(heart_high-heart_low)))
      digitalWrite(5, HIGH);
    else
      digitalWrite(5,LOW); 
    if(data[0] > (heart_high-.6*(heart_high-heart_low)))
      digitalWrite(6, HIGH);
    else
      digitalWrite(6,LOW); 
    if(data[0] > (heart_high-.5*(heart_high-heart_low)))
      digitalWrite(7, HIGH);
    else
      digitalWrite(7,LOW); 
    if(data[0] > (heart_high-.4*(heart_high-heart_low)))
      digitalWrite(8, HIGH);
    else
      digitalWrite(8,LOW); 
    if(data[0] > (heart_high-.3*(heart_high-heart_low)))
      digitalWrite(9, HIGH);
    else
      digitalWrite(9,LOW); 
    if(data[0] > (heart_high-.2*(heart_high-heart_low)))
      digitalWrite(10, HIGH);
    else
      digitalWrite(10,LOW); 
    if(data[0] > (heart_high-.1*(heart_high-heart_low)))
      digitalWrite(11, HIGH);
    else
      digitalWrite(11,LOW);  

  }    //span check
  else
    for(i=2; i<12; i++)//turn all the LEDs off if we're flatlined
      digitalWrite(i,LOW);





}   //loop