% Chapter 6 : Example 6.1
%             Cascade form conversion
%
b = [1,-3,11,-27,18]; a = [16,12,2,-4,-1];
[b0,B,A] = dir2cas(b,a)
format long; delta = impseq(0,0,7);
hpar = casfiltr(b0,B,A,delta)
hdir = filter(b,a,delta)