improved sigmoid sensor parameter plotting for thesis figure

@sigmoidSensor/sigmoidSensor.m

@@ -16,7 +16,7 @@ classdef sigmoidSensor
         [obj]   = initialize(obj, alphaDist, betaDist, alphaTilt, betaTilt, tilt, azimuth); % initialize sensor, define parameters
         [value] = sensorPerformance(obj, agentPos, targetPos); % determine sensor performance for a given single sensor and target geometry
         [value] = halfAngle(obj); % tilt angle (deg) at which sensor performance is halved
-        [f]     = plotParameters(obj); % debug, plot sensor response as a function of distance and tilt angle
+        [f]     = plotParameters(obj, f); % debug, plot sensor response as a function of distance and tilt angle
     end
     methods (Access = private)
         x = distanceMembership(obj, d); % used in computing distance factor of sensor performance