function result=Hstep(g,end_time)
%[val]=Hstep(g,end_time)
%g is tf
%-------------------------------------------------------|%
%|(C)2005 Bui Trung Hieu				|%
%|Website: www.khvt.com					|%
%|Email: matlab@khvt.com				|%
%-------------------------------------------------------|%
sig=tf(1,[1 0]);
g=minreal(g*sig);
syms x t real
f=tf2sym(g);            
f=ilaplace(f,x,t);
k=0:0.05:end_time;
plot(k,subs(f,k));
result=f;
title('Ham dap ung khi tin hieu vao la step');
ylabel('Do lon tin hieu dap ung');
xlabel('Thoi gian (t)');
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