Tune flywheels

Switch to hybrid kalman filter, plot voltage error

Change-Id: I9ade9a741aae58bdb3818c23bfe91b18786235f3
diff --git a/frc971/control_loops/python/control_loop.py b/frc971/control_loops/python/control_loop.py
index 27a659a..9c36c90 100644
--- a/frc971/control_loops/python/control_loop.py
+++ b/frc971/control_loops/python/control_loop.py
@@ -284,9 +284,9 @@
 
     def InitializeState(self):
         """Sets X, Y, and X_hat to zero defaults."""
-        self.X = numpy.zeros((self.A.shape[0], 1))
+        self.X = numpy.matrix(numpy.zeros((self.A.shape[0], 1)))
         self.Y = self.C * self.X
-        self.X_hat = numpy.zeros((self.A.shape[0], 1))
+        self.X_hat = numpy.matrix(numpy.zeros((self.A.shape[0], 1)))
 
     def PlaceControllerPoles(self, poles):
         """Places the controller poles.