diff --git a/matlab/gtsam_examples/RangeISAMExample_plaza.m b/matlab/gtsam_examples/RangeISAMExample_plaza.m
index 788745a3d..cffe81c30 100644
--- a/matlab/gtsam_examples/RangeISAMExample_plaza.m
+++ b/matlab/gtsam_examples/RangeISAMExample_plaza.m
@@ -27,7 +27,7 @@ import gtsam.*
 %    Time (sec)	X_pose (m)	Y_pose (m)
 % TD
 %    Time (sec)	Sender / Antenna ID	Receiver Node ID	Range (m)
-if false % switch between data files
+if true % switch between data files
   datafile = findExampleDataFile('Plaza1_.mat');
   headingOffset=0;
   minK=200; % minimum number of range measurements to process initially
@@ -65,7 +65,7 @@ isam = ISAM2;
 %% Add prior on first pose
 pose0 = Pose2(GT(1,2),GT(1,3),headingOffset+GT(1,4));
 newFactors = NonlinearFactorGraph;
-if ~addRange | ~useGroundTruth
+if ~addRange || ~useGroundTruth
   newFactors.add(PriorFactorPose2(0,pose0,noiseModels.prior));
 end
 initial = Values;
diff --git a/matlab/gtsam_examples/RangeSLAMExample_plaza.m b/matlab/gtsam_examples/RangeSLAMExample_plaza.m
index 24619b69c..bd643d854 100644
--- a/matlab/gtsam_examples/RangeSLAMExample_plaza.m
+++ b/matlab/gtsam_examples/RangeSLAMExample_plaza.m
@@ -27,7 +27,7 @@ import gtsam.*
 %    Time (sec)	X_pose (m)	Y_pose (m)
 % TD
 %    Time (sec)	Sender / Antenna ID	Receiver Node ID	Range (m)
-datafile = findExampleDataFile('Plaza1_.mat');
+datafile = findExampleDataFile('Plaza2_.mat');
 load(datafile)
 M=size(DR,1);
 K=size(TD,1);
@@ -42,7 +42,7 @@ base = noiseModel.mEstimator.Tukey(5);
 noiseModels.range = noiseModel.Robust(base,noiseModel.Isotropic.Sigma(1, sigmaR));
 
 %% Add prior on first pose
-pose0 = Pose2(GT(1,2),GT(1,3),GT(1,4));
+pose0 = Pose2(GT(1,2),GT(1,3),pi+GT(1,4));
 graph = NonlinearFactorGraph;
 graph.add(PriorFactorPose2(0,pose0,noiseModels.prior));
 initial = Values;
@@ -84,7 +84,7 @@ for i=1:M
 end
 toc
 
-%% GRaph was built, optimize !
+%% Graph was built, optimize !
 tic
 batchOptimizer = LevenbergMarquardtOptimizer(graph, initial);
 result = batchOptimizer.optimize();