diff --git a/buoy_gazebo/scripts/mbari_wec_batch b/buoy_gazebo/scripts/mbari_wec_batch
index 9c15aa29..08088f04 100755
--- a/buoy_gazebo/scripts/mbari_wec_batch
+++ b/buoy_gazebo/scripts/mbari_wec_batch
@@ -45,6 +45,14 @@ from rclpy.node import Node
 DEFAULT_PHYSICS_MAX_STEP_SIZE = 0.001  # seconds
 
 
+def to_shape(a, shape):
+    y_ = shape[0]
+    y = a.shape[0]
+    y_pad = (y_-y)
+    return np.pad(a, (0, y_pad),
+                  mode = 'constant', constant_values=a[-1])
+
+
 class MonoChromatic(object):
     def __init__(self, A, T):
         self.A, self.T = A, T
@@ -410,13 +418,28 @@ def generate_simulations(sim_params_yaml):
                 os.path.join(batch_results_dir,
                              sim_params_date_yaml))
 
-    # generate test matrix
-    batch_params = list(zip(*[param.ravel() for param in np.meshgrid(physics_step,
-                                                                     door_state,
-                                                                     scale_factor,
-                                                                     battery_state,
-                                                                     mean_piston_position,
-                                                                     incident_waves)]))
+    if 'matrix_mode' not in sim_params or \
+      ('matrix_mode' in sim_params and sim_params['matrix_mode']):
+        # generate test matrix
+        batch_params = list(zip(*[param.ravel() for param in np.meshgrid(physics_step,
+                                                                         door_state,
+                                                                         scale_factor,
+                                                                         battery_state,
+                                                                         mean_piston_position,
+                                                                         incident_waves)]))
+    elif 'matrix_mode' in sim_params and not sim_params['matrix_mode']:
+        # generate test arrays
+        batch_params = [physics_step,
+                        door_state,
+                        scale_factor,
+                        battery_state,
+                        mean_piston_position,
+                        incident_waves]
+        shape = max(batch_params, key=len).shape
+        for idx, param in enumerate(batch_params):
+            if np.array(param).shape != shape:
+                batch_params[idx] = to_shape(np.array(param), shape)
+        batch_params = list(zip(*[np.array(param).ravel() for param in batch_params]))
 
     node.get_logger().info(f'Generated {len(batch_params)} simulation runs')
     node.get_logger().debug('PhysicsStep, PhysicsRTF, Seed, Duration, DoorState, ScaleFactor' +