% Redirecting AMPL output
% Note that due to MATLAB architecture, output redirection only works
% if access to the AMPL API jar file is set up statically (e.g. via the
% command edit('classpath.txt') ). To execute this example the classpath 
% must be edited BEFORE calling setupOnce, and MATLAB must be restarted.

% The pause commands are needed to give MATLAB time to update the handlers
% while AMPL executes in the background

% create an AMPL interpreter
ampl = AMPL;
ampl.eval('print "Normal ampl!";');

% initialize the redirection subsystem, making the AMPL output pass 
% through MATLAB. 
ampl.initializeEvents;

% try printing something
ampl.eval('print "No listener registered";');
pause(0.1)
% add a listener implemented with a function (see myListener.m)
lh = addlistener(ampl, 'Output',@myListener);
pause(0.1)
% test out that listener
ampl.eval('for {i in 1..10} { printf "this is the %i execution", i;}');

pause(1)
% remove the listener previously defined
delete(lh)
pause(0.1)
% try printing something
ampl.eval('print "No listener registered!";');