AP_Math - initialise vector2 and vector3 x,y,z values to zero. Doug found (and I confirmed) that if vectors or matrices were declared in a function (i.e. a local variable), they would often have non-zero values. Global declarations don't have this problem - it's a C++ performance thing it seems.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@878 f9c3cf11-9bcb-44bc-f272-b75c42450872

libraries/AP_Math/vector2.h

@@ -32,7 +32,7 @@ struct Vector2
 
 
 	// trivial ctor
-	Vector2<T>() {}
+	Vector2<T>(): x(0),y(0) {}
 
 	// setting ctor
 	Vector2<T>(const T x0, const T y0): x(x0), y(y0) {}

libraries/AP_Math/vector3.h

@@ -50,7 +50,7 @@ public:
 	T x, y, z;
 
 	// trivial ctor
-	Vector3<T>() {}
+	Vector3<T>(): x(0),y(0),z(0) {}
 
 	// setting ctor
 	Vector3<T>(const T x0, const T y0, const T z0): x(x0), y(y0), z(z0) {}