Section 6. At the MATLAB prompt type,

>> Section6 

and make sure that you have selected the
right path for 

	Section6.m
	Qzdiv.m 
	Qzswitch.m

(the last two written by Chris Sims, and available from his Web-page).

In addition, the 

	Qz.m 

file (MATHWORKS copyright, available in the MATLAB\MATFUN toolbox) should 
be placed in the same directory.