Index: mttroot/mtt/lib/control/PPP/ppp_ex6.m
==================================================================
--- mttroot/mtt/lib/control/PPP/ppp_ex6.m
+++ mttroot/mtt/lib/control/PPP/ppp_ex6.m
@@ -26,12 +26,12 @@
   A_u = [-2;-0.5];		# Input
   Q = 1;			# Output weight
 
   ## Constrain  input 1 at time tau=0
   Tau = 0;
-  Max = 1;
-  Min = -Max;
+  Max = [1;inf]
+  Min = [-inf;-inf];
   Order = 0;
   i_u = 1;
   
   ## Simulation
   W=1;