ADDED   mttroot/mtt/bin/trans/m/mtt_euler.m
Index: mttroot/mtt/bin/trans/m/mtt_euler.m
==================================================================
--- /dev/null
+++ mttroot/mtt/bin/trans/m/mtt_euler.m
@@ -0,0 +1,7 @@
+function [x] = mtt_euler(x,dx,dt,stepfactor,Nx,open) # Euler update
+  I_open = nozeros(open.*[1:Nx]'); # Indices of open switches
+  x(I_open) = 0.0;		# Open switches have zero state
+  I = nozeros(!open.*[1:Nx]');	# Indices of states to update
+  x(I) = x(I) + dx(I)*dt;	# Update states except open switches.
+endfunction;
+