[Octave-bug-tracker] [bug #49295] [octave forge] (control) tf object gives wrong results with impulse (and initial)

[Doug Stewart]

Follow-up Comment #1, bug #49295 (project octave):

This can be closed now.
the fix is in control-3.1.0

this works.

clear
% Impulse response test
  t=linspace(0,5,51); % time vector
% create transfer function
  H=tf(1,[1 1]);
% impulse response - analytic expression
  ht=exp(-t)';
% impulse response - numerical
  ht_num=impulse(H,5,0.1);
% difference (should be close to eps) but is not !
 err=ht - ht_num;

%% Then repeat but with state-space object
  Hss=ss((tf(1,[1 1]))); % create state-space object
% numerical simulation
  ht_num_ss=impulse(Hss,5,0.1);
% difference is as expected
  err_ss=ht - ht_num_ss


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