Index: mttroot/mtt/lib/control/PPP/ppp_lin_run.m
==================================================================
--- mttroot/mtt/lib/control/PPP/ppp_lin_run.m
+++ mttroot/mtt/lib/control/PPP/ppp_lin_run.m
@@ -92,11 +92,11 @@
   endif
   
 
   ## Check w.
   [n_w,m_w] = size(w);
-  if ( (n_w<>n_y) || (m_w<>1) )
+  if ( (n_w!=n_y) || (m_w!=1) )
     error(sprintf("ppp_lin_run: w must a column vector with %i elements",n_y));
   endif
   
   ## Initialise
   x_est = p_o.x_0;
@@ -125,11 +125,11 @@
       error(sprintf("Control method %s not recognised", p_c.Method));
     endif
 
     ##Sanity check A_u
     [p_c.n_U,M_u] = size(p_c.A_u);
-    if (p_c.n_U<>M_u)
+    if (p_c.n_U!=M_u)
       error("A_u must be square");
     endif
     
     
     U = K_w*w;			# Initial control U

Index: mttroot/mtt/lib/control/PPP/ppp_ystar.m
==================================================================
--- mttroot/mtt/lib/control/PPP/ppp_ystar.m
+++ mttroot/mtt/lib/control/PPP/ppp_ystar.m
@@ -45,11 +45,11 @@
   else
     n_u = length(U)/n_U;	# Deduce n_u from U if no system
   endif
   
   [n_x0,m_x0] = size(x_0);
-  if n_x0<>n_x
+  if n_x0!=n_x
     error(sprintf("x_0 must be a column with length %i", n_x));
   endif
   
 
   [n,m]=size(tau);