rename noisevector class -> avgvector

The vectors feature is averaging, and not adding noise.

Change-Id: I05def8ab9ea7a2cece8db09c36c303e13ef40927

Transceiver52M/Transceiver.h

@@ -80,7 +80,7 @@ struct TransceiverState {
 
   /* Received noise energy levels */
   float mNoiseLev;
-  noiseVector mNoises;
+  avgVector mNoises;
 
   /* Shadowed downlink attenuation */
   int mPower;

Transceiver52M/radioVector.cpp

@@ -76,22 +76,25 @@ bool radioVector::setVector(signalVector *vector, size_t chan)
 	return true;
 }
 
-noiseVector::noiseVector(size_t size)
+avgVector::avgVector(size_t size)
 	: std::vector<float>(size), itr(0)
 {
 }
 
-float noiseVector::avg() const
+float avgVector::avg() const
 {
 	float val = 0.0;
 
+	if (!size())
+		return 0.0f;
+
 	for (size_t i = 0; i < size(); i++)
 		val += (*this)[i];
 
 	return val / (float) size();
 }
 
-bool noiseVector::insert(float val)
+bool avgVector::insert(float val)
 {
 	if (!size())
 		return false;

Transceiver52M/radioVector.h

@@ -48,9 +48,9 @@ private:
 	GSM::Time mTime;
 };
 
-class noiseVector : std::vector<float> {
+class avgVector : std::vector<float> {
 public:
-	noiseVector(size_t size = 0);
+	avgVector(size_t size = 0);
 	bool insert(float val);
 	float avg() const;