diff --git a/matlab_simulation/02-examples_practice/gallerypfield/potentialField.m b/matlab_simulation/02-examples_practice/gallerypfield/potentialField.m
index befaa49..65563b5 100644
--- a/matlab_simulation/02-examples_practice/gallerypfield/potentialField.m
+++ b/matlab_simulation/02-examples_practice/gallerypfield/potentialField.m
@@ -8,7 +8,7 @@
 numObsts = length(obsts);
 
 for i=1:numObsts
-    co=o{i};
+    co=obsts{i};
     [co(:,1), co(:,2)] = poly2ccw(co(:,1), co(:,2)); % Convert to ccw poly
     K = convhull(co(:,1), co(:,2)); % Take convex hull
     co = co(K(1:end-1),:); 
@@ -64,7 +64,7 @@
     
     gVcur = Katt*(pos-endPos);
     for m=1:numObsts
-        curobs = o{m};
+        curobs = obsts{m};
         if (inpolygon(pos(1),pos(2),curobs(:,1),curobs(:,2)))
             gVcur = [NaN NaN];
         else
@@ -109,7 +109,7 @@
         
         %Repulsive potentials
         for m=1:numObsts
-            curobs = o{m};
+            curobs = obsts{m};
             if (inpolygon(pos(1),pos(2),curobs(:,1),curobs(:,2)))
                 V(i,j) = Vmax;
                 gV(:,i,j) = [NaN NaN];