Getting NAN for simple equation

Questions & Answers
1

I currently have 7 different PID controllers controlling a simulation, all with different tuning values. They are all coded the exact same aside from variable names and tuning values. The strangest thing is that the latest one I added is giving me NAN despite the simple equation outputting what I would think is a usable value.

Here is my code:

//Input Values in fixedUpdate
var dist : float = Vector3.Distance(pathpoint, uavPos);
var zVel : float = UAV.transform.InverseTransformDirection(GetComponent.<Rigidbody>().velocity).z;

//Runs through 2 PIDs in fixedUpdate
var distErr : float= locZError(0, dist);
var velErr : float = velZError(zVel, distErr);

//PID with NAN Error
private var errSumVelZ : float;
private var lastTimeVelZ : float;
private var lastErrVelZ : float;
function velZError(input : float, setPoint : float){
   //input=0.0001448985 setPoint= 181.3836
   var now : float = Time.time;
   var timeChange : float = (now - lastTimeVelZ);
   
   var error : float = setPoint - input;

   Debug.Log(error); // outputs 181.3835
   Debug.Log(timeChange); // outputs 0.01999998
   Debug.Log(error * timeChange); // outputs 3.627666
   errSumVelZ += (error * timeChange);
   Debug.Log(errSumVelZ); //outputs NAN

   var dErr : float = (error - lastErrVelZ) / timeChange;
   
   var Output : float = (.3 * error) + (0 * errSumVelZ) + (2 * dErr);
	
   lastErrVelZ = error;
   lastTimeVelZ = now;
   
   return Output;
}

What would cause ‘errSumVelZ += 3.627666’ to create NAN?

2

Initialize errSumVelZ
like

private var errSumVelZ : float =0.0;