Added matlab code samples.

All of these code samples currently are mis-identified in my repositories. I'm
donating them to the cause.

samples/Matlab/distance.m

@@ -0,0 +1,13 @@
+function [ value,isterminal,direction ] = distance( t,y,mu )
+% DISTANCE compute the distance from the attactors
+%   [ value,terminal,direction ] = distance( t,y )
+
+d=1e-2; % FIXME
+
+% TODO mettere if se tolleranza D-d<tol -> value=0
+D=sqrt((y(1)+mu).^2+y(2).^2); % distance from the largest primary
+
+value=d-D;
+isterminal=1;
+direction=0;
+end